bluuebunny/crossref_metadata_2025 huggingface dataset:
QUANTUM ANALYTICAL THEORY FOR GIANT MAGNETORESISTANCE IN A MAGNETIC SANDWICH STRUCTURE
Authors: DONG ZHENG-CHAO  ,   淮阴师范学院物理系
Published: November 2020

Using the quantum statistical Green's function approach,we have studied the giant magneto resistance effect in magnetic sandwich structure,and developed a unified conductivity fomula.The relation between the classical and quantum theories and the transition from classical to quantum result are also discussed.
RAMAN SPECTRA FROM ACOUSTIC PHONONS IN NEARLY PERIODIC SiGe/Si SUPERLATTICES
Authors: LIU XIAO-HAN  , HUANG DA-MING  , WANG XING-JUN  , ZHANG CHUN-HONG  , ZHU HAI-JUN  , JIANG ZUI-MIN  , WANG XUN  ,   复旦大学物理系应用表面物理国家重点实验室
Published: November 2020

The transfer matrix method has been used to calculate the Raman spectra of acoustic phonons in nearly periodic SiGe/Si superlattices,including the supperlattices with finite number of periods,the coupled supperlattices,and those with layer-thickness fluctuations.The properties of the above nearly periodic systems are found to be very different from those of periodic or disordered systems.In stead of the folded acoustic phonons appearing in the Raman spectra from ideal superlattices (main peak),the other satellite peaks are also observable in the finite system due to the existence of boundaries.For the coupled superlattices,the main peaks split into two due to the interference of the acoustic waves in different superlattices.For the superlattices with layer-thickness fluctuation,the main Raman peaks show asymmetric broadening and a tail towards high wave number are observable.The calculated results are compared to the measured spectra and good agreement between them is obtained.
CONNECTION BETWEEN BERRY PHASE AND AB PHASE
Authors: LEI YI-AN  , ZENG JIN-YAN  ,   中国科学院理论物理研究所;北京大学物理系
Published: November 2020

Berry pointed out that the Aharonov-Bohm phase could be considered as a Berry phase.In his argument,he gave up the adiabatic approximation,and the nonstationarity of quantum states was not concerned.In this paper we re-investigate Berry’s proof,and find that his final statement is correct,and in his argument,the adiabatic approximation should be used.In the AB effect,a moving electron is described as a moving wave packet (nonstationary),and the appearance of AB phase originates from the requirement that the evolution of the wave packet must satisfy the Schrdinger equation.
INELASTIC COLLISION PROCESS OF Rb ATOM BETWEEN INITIAL AND FINAL CHANNELS
Authors: QU YI-ZHI  , WANG JIAN-GUO  , LI JIA-MING  ,   中国科学院物理研究所
Published: November 2020

Based on the quantum defect theory, the infinite Rydberg states and its adjacent continue states with the same angular moment property will form a channel. Previous studies have considered the collision-induced transitions from a single initial state to a final channel. Here we extend these thoery to include all possible transitions between two channels. By defining a renormalized generalized oscillator strength density (GOSD) which varies smoothly across threshold, the inelastic collisions from an initial channel to a final channel can be treated in a unified manner. As an example, we present the renormalized GOSD of the Rb atom from s-initial to p-final channel, and also from s-initial to s-final channel.
ELECTRON BEAM ENERGY MODULATION IN SR-FREE ELECTRON LASER
Authors: YANG ZHEN-HUA  , WU YU-PU  ,   北京应用物理与计算数学研究所
Published: November 2020

In this paper,we have computed with three different methods the electron beam energy modulation in optical klystron on storage ring free electron laser and also computed the effects of the electron beam parameters on energy modulation.The numerical results show that the three dimensional simulation is necessary.
STRUCTURE EVOLUTION ANALYSIS OF ULTRAFINE PARTICLE OF SILVER OXIDE (Ag2O)
Authors: LIU CUN-YE  , LI JIAN  , LIANG YI-PING  ,   西南师范大学物理系
Published: November 2020

We investigate the crystal structure and the spontaneos evolution of the silver oxide(Ag2O) ultrafine particles(UFP) produced by the vacuun-sputtering method.By using transmission electron microscopy and wide angle X-ray diffractometer and X-ray photoelectron spectrometer,the morphology and nanostructure and size distribution of UFP were measured and analysed.The process of the spontaneos evolution of UFPs was discussed by the spectrum fractal and thermodynamic potential and size-dependence of particles.It was suspected that the self-reduction decrystallization and decompose of crystal Ag2O UFPs might be intrinsic property of the ultrafine structure when the size of aggregate was less than the critical value.Furthermore,The reduced silver atoms have secondary recrystallization effect.
ELECTRON ELECTRON INTERACTION AND SOLITON EXCITATION(Ⅱ)——THE EFFECT OF ELECTRON CORRELATION ON THE CREATION ENERGY OF SOLITON
Authors: MA YUN-SHENG  , WU CHANG-QIN  , SUN XIN  , FU RONG-TANG  , FU ROU-LI  , YE HONG-JUAN  ,   (1)复旦大学物理系;李政道物理学综合实验室; (2)中国科学院上海技术物理研究所;红外物理国家重点实验室
Published: November 2020

Does electron interaction enhance or reduce the creation energy of soliton? The results based on different theories conflict with each other. In this paper, the reason for such conflict has been revealed and a new method is proposed to calculate the creation energy of soliton (only intensive quantities are involved in calculation). Our result shows: the electron interaction enhances the creation energy of soliton, but the enhancement of the soliton is less than that of-e-h pair.
THEORETICAL TREATMENT OF RADIATION TRAPPING IN A MULTIPLE LINES COUPLED SYSTEM
Authors: LAI RE  , WANG JIAN  , WANG CHU-JI  , MA XING-XIAO  ,   中国科学技术大学化学物理系
Published: November 2020

The purpose of this paper is to propose a theoretical treatment of radiation trapping in a multiple lines coupled system in which coupling includes collisional energy transfer and cross absorption between the excited states. First, to describe the coupled system, the Holstein equation of radiation trapping is extended to an integral differential master equation group in which the vector and matrix form is adopted. Then by use of operator manipulations, the asymptotic solution in the form of a series expansion in terms of operators is presented. Finally, the asymptotic solution is reduced, leading to a result which can not only give the system a complete description, but also has far more advantages than the simple cut off solution. A numeral illustration of a two excited states system is also presented.
PARTICLE TRANSPORT FROM TURBULENCE DRIVEN BY-PARALLEL VELOCITY SHEAR
Authors: FU XIN-YU  , DONG JIA-QI  , YING CHUN-TONG  , LIU GUANG-JUN  ,   (1)核工业西南物理研究院; (2)清华大学工程物理系,北京100084
Published: November 2020

The turbulence driven by ion temperature gradient,mass flow shear,parallel to the magnetic field,and the impurity ion density gradient in plasmas with multiple ion species is studied in a sheared slab magnetic configuration.The particle diffusion induced by the turbulence is obtained with quasi-linear fluid theory.The possible inward ‘pinch' of the majority ions and the inward flow of the impurity ions,depending on plasma parameters,are both calculated,and the corresponding diffusion coefficients are given.It is shown that the increase of parallel velocity shear may have benificial effects on plasma confinement.The correlations with Tokamak experimental observations are discussed.
X-RAY POWDER DIFFRACTION RIETVELD METHOD IN-QUANTITATIVE DETERMINATION OF SiC POLYTYPES
Authors: LIU HONG-CHAO  , GUO CHANG-LIN  ,   中国科学院上海硅酸盐研究所
Published: November 2020

It is very difficult to obtain SiC polytypes distribution by normal X-ray powder diffraction quantitative phase analysis methods. The whole pattern fitting Rietveld method is introduced to address this problem. The principle and advantages of Rietveld method in determining SiC polytypes distribution are described. The final results show that the distribution of the most common four SiC polytypes, 6H, 4H, 3C and 15R, can be given accurately. The detection limits of each polytypes are also estimated based on their standard deviations
RESONANT POLARON EFFECT RELATED WITH HIGH EXCITED STATES OF DONORS IN GaAs
Authors: CHEN ZHANG-HAI  , CHEN ZHONG-HUI  , LIU PU-LIN  , SHI XIAO-HONG  , SHI GUO-LIANG  , SHEN XUE-CHU  ,   中国科学院上海技术物理研究所红外物理国家重点实验室
Published: November 2020

Photoconductivity (PC) spectra of impurities in n type GaAs under magnetic field are presented. The resonant interaction between high excited states of bound electrons and LO phonons under relatively low magnetic field was observed. The magnetic field dependency of PC response of resonant polaron and the physical origin of the PC peak stuck on the energy position of LO phonon are discussed.
SINGLE ELECTRON CAPTURE CROSS SECTION MEASURE MENT OF Ho+, Ce+ AND La+ IMPACT ON H2
Authors: WANG ZHI-GANG  , YAN BIN  , GU JIAN  , WU WEI-MIN  , WU SONG-MAO  , LU FU-QUAN  , YANG FU-JIA  ,   复旦大学物理二系;李政道物理学综合实验室
Published: November 2020

The single electron capture cross sections for 5-30keV Ho+, La+ and Ce+ impact on H2 at a fixed anode voltage of an ion source and 10keV Ho+ impact on H2 at different anode voltage have been measured by the “growth rate method”. We found that the variation of the hollow cathode ion source’s anode voltage affected the proportion of the metastable states of the rare earth ions, and the proportion accounts for the significant change of single capture cross sections.
STUDYING ON NONLINEAR OPTICAL PROPERTIES OF Fe2O3 NANOPARTICLES IN COLLOIDAL SOLUTION
Authors: YU BAO-LONG  , ZHANG GUI-LAN  , TANG GUO-QING  , WU XIAO-CHUN  , CHEN WEN-JU  , YANG BIN-ZHOU  ,   (1)南开大学现代光学研究所; (2)中国科学院西安光学精密机械研究所瞬态光学技术国家重点实验室
Published: November 2020

The nonlinear optical properties of Fe2O3 nanoparticles coated with a layer of organic molecules(DBS) in toluene and bare nanoparticles in hydrosol have been studied in the transparency region by Z scan technique.The key parameters such as nonlinear refractive index γ,two-photon absorption coefficient β and the variation of refractive index per unit photoexcited carrier density σr as well as free-carrier absorption cross section σab were determined.The influences of free-carrier effects on optical nonlinearities of Fe2O3 nanoparticles were discussed.
VALENCE BAND OFFSETS OF Ge/ZnSe(100) STUDIED BY SYNCHROTRON RADIATION PHOTOEMISSION
Authors: BAN DA-YAN  , FANG RONG-CHUAN  , YANG FENG-YUAN  , XU SHI-HONG  , XU PENG-SHOU  , YUAN SHI-XIN  ,   (1)中国科学技术大学国家同步幅射实验室; (2)中国科学技术大学物理系; (3)中国科学院上海技术物理研究所
Published: November 2020

The band lineup of a Ge/ZnSe(100) polar interface has been studied by synchrotron radiation photoemission spectroscopy.Surface sensitive core level spectra indicate that Ge atoms in the overlayer can react with Se atoms at the interface.The valence band offset of this heterojunction has been obtained using core level techniques,and found to be 1.76±0.1eV.The effect of polar surface ZnSe(100) on the valence band offset has been discussed in light of the interface bond polarity model.The experimental results agree well with the theory.
GRAVITATIONAL SOLITONS PRODUCED BY PLANE SYMMETRIC SCALAR FIELDS
Authors: QIANG WEN-CHAO  ,   西安建筑科技大学基础部
Published: November 2020

A group of gravitational solitons produced by plane-symmetric scalar fields is found.The singularity and energy problems of these solitons are discussed.
THE REFLECTION AND TRANSMISSION OF ELECTRO MAGNETIC WAVE WITH s POLARIZATION ON A MOVING FRONT OF AN UNDERDENSE PLASMA
Authors: QU WEI-XING  , YU WEI  , XU ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The reflection and transmission on a moving plasma's front driven by an intense laser is investigated for an electromagnetic wave with s polarization. Using the boundary conditions of electromagnetic wave, we derive the formulae of the coefficients of the reflection and transmission and discuss them for some special cases.
NEUTRAL PARTICLE STUDIES DURING H-MODE ON HT-6M TOKAMAK
Authors: LIU SHENG-XIA  ,   中国科学院等离子体物理研究所
Published: November 2020

The H-mode has been achieved on HT-6M Tokamak by edge ohmic heating (EOH) method. The H-mode is studied by the neutral particle measurement method. The escape particle flux decreases- during H-mode. The central neutral atoms density drop, and the central particle confinement time-- τp is increased about one times after applying the EOH.
HIGH PRESSURE STUDY ON CRYSTAL FIELD PARAMETERS AND FREE ION PARAMETERS FOR GdOBr∶Eu
Authors: LI HONG-NIAN  , CHI YUAN-BIN  , WANG LI-ZHONG  , LIU SHEN-XIN  , XU YA-BO  ,   (1)吉林大学超硬材料国家重点实验室; (2)浙江大学物理系; (3)中国科学院长春物理研究所
Published: November 2020

Simulation of crystal field levels and the barycenters are conducted, based on the fluorescence spectra of GdOBr∶Eu under ambient and high pressures. Calculated results are concide with experimental results very well. Variations of Slater and spin-orbit parameters with pressure are obtained. With pressure increasing, B40,B60 increase, B64 decreases, and B20 and B44 show some what fluctuating variations. Strength of the crystal field decreases with increasing pressure from 0GPa to about 8GPa, then increases slightly until 12GPa. Variation of spin-orbit parameter is similar to that of crystal field strength. Slater parameters Ei(i=1—3) show different variations for different i under pressures. E1∶E2∶E3 is little short of the value of hydrogenic ratio, but varies slightly with increasing pressure. To reveal physical significance in the variations of these parameters, comparison with variations with different hosts are made.
INTERSUBBAND ABSORPTION IN p-TYPE GexSi1-x/Si MULTIPLE QUANTUM WELLS AND ITS ANALYSIS
Authors: YU MIN-FENG  , YANG YU  , SHEN WEN-ZHONG  , ZHU HAI-JUN  , GONG DA-WEI  , SHENG CHI  , WANG XUN  ,   (1)复旦大学表面物理国家重点实验室; (2)复旦大学应用表面物理国家重点实验室; (3)中国科学院上海技术物理研究所红外物理国家重点实验室; (4)中国科学院上海冶金研究所
Published: November 2020

A theoretical and experimental study of intersubband absorption in p-type GexSi1-x/Si multiple quantum wells are presented,the calculations are performed with envelop-function approach,with full inclusion of the degeneracy and warping of the three topmost bulk valence bands described by the strain-dependent Luttinger-Kohn Hamiltonian.The Hartree potential and the exchange correlation interaction are taken into account in a self-consistent manner.And finally the absorption spectra is calculated.We contribute some absoptions observed with normal incident unpolarized infra-beam to the band-mixing of heavy,light and split-off bands in GexSi1-x/Si quantum wells.
SOLUTE DISTRIBUTION CHARACTERISTICS OF Pd40Ni40P20 ALLOY SOLIDIFIED IN MICROGRAVITY AND GRAVITY CONDITIONS
Authors: LIU RI-PING  , ZHANG XIANG-YI  , ZHAO JIAN-HUA  , HE DUAN-WEI  , SUN LI-LING  , QIN ZHI-CHENG  , XU YING-FAN  , WANG WEN-KUI  ,   (1)中国科学院物理研究所; (2)中国科学院物理研究所;燕山大学材料工程学院
Published: November 2020

This paper studies the difference of solute distribution in microstructure of Pd40Ni40P20 alloy solidified on board a Chinese Retrievable Satellite and on the ground.Compared with those in normal gravity condition(1g),it was found that P content was lower but Pd content was higher in the primary phase,however in the eutectic region P content increased but Pd content decreased in microgravity condition(μg).By evaluating the mass transport coefficients in both cases it can be concluded that the difference in solute distribution both in 1g and μｇ conditions was due to the existence of buoyancy convection in the ground-based experiments.
THE PEAK AND BANDWIDTH IN RESONANCE FLUORESCENCE SPECTRUM OF TWO-AND THREE-ATOM SYSTEMS
Authors: LIU REN-HONG  , TAN WEI-HAN  , ZHANG WEI-PING  ,   (1)澳大利亚Macquarie大学MPCE学院; (2)中国科学院上海光学精密机械研究所;上海大学物理系
Published: November 2020

In this paper the dependence of peak and bandwidth of resonance fluorescence spectrum for two-and three-atom systems on the Rabi frequency is studied,and the effects of self absorption and stimulated emission on these peaks and bandwidths are also considered.
COMPRESSION OF BRIGHT OPTICAL PULSE BY PULSE PAIR IN THE NORMAL DISPERSION REGIME OF SINGLE MODE FIBERS
Authors: CAO WEN-HUA  , ZHANG YOU-WEI  , LIU SONG-HAO  , GUO QI  , XU WEN-CHENG  ,   (1)华南师范大学量子电子学研究所; (2)五邑大学电子工程系
Published: November 2020

A novel method that can lead to bright optical pulse compression in the normal-dispersion regime of single mode fiber is proposed.It consists of copropagating a bright pulse with a intense pulse pair in a single mode fiber.Various cases of the bright pulse compression are studied numerically under realistic practical conditions.We found that, as compared with the previous compression method,this method is not only of more practical use but also can achieve better compression of the bright pulse.
FACTORS THAT INFLUENCE THE GIANT MAGNETORESISTANCE IN GRANULAR FILMS
Authors: LI ZUO-YI  , PENG ZI-LONG  , ZHENG YUAN-KAI  , HU YONG-SHI  , QIU JIN-JUN  ,   华中理工大学固体电子学系，武汉  430074
Published: November 2020

The influence of the particle size and the magnetic deposite on the giant magnetoresistance (GMR) was investigated.Based on the free electron model and spin-dependent scattering theory,the self-energy of the conduction electrons in the granular film system was calculated.In the computing course,we connected the spin-scattering terms with the macroquantity,and abtained the formalism of GMR vs.concentration and GMR vs.size.The simulation curves show that increasing the magnetic concentation and decreasing the particle size can enhance the GMR.
STUDY ON CYCLOTRON RESONANCE SPECTRA OF TWO-DIMENSIONAL ELECTRON GASES IN PSEUDOMORPHIC InxGa1-xAs/In0.52Al0.48As HETEROJUNCTIONS
Authors: CHEN ZHANG-HAI  , HU CAN-MING  , CHEN JIAN-XIN  , SHI GUO-LIANG  , LIU PU-LIN  , SHEN XUE-CHU  , LI AI-ZHEN  ,   (1)中国科学院上海技术物理研究所红外物理国家重点实验室，上海  200083; (2)中国科学院上海冶金研究所信息功能材料国家重点实验室，上海  200050
Published: November 2020

The electron effective masses, scattering time and mobilities near the Fermi level for the lowest two subbands of the two-dimensional electron gases in a pseudomorphic In0.80Ga0.20As/In0.53Ga0.47As/In0.52Al0.48AsHEMT structure are determined by fitting the cyclotron resonance spectra. The significant enhancement of the electron effective masses, resulting from the conduction band nonparabolicity and the wave function penetration, is observed. The evident subband dependencies of the electron scattering time and mobilities dominated by the alloy scattering and ionized impurities scattering are also discussed.
EXACT SOLUTIONS TO THE NONLINEAR COUPLED SCALAR FIELD EQUATIONS
Authors: FAN EN-GUI  , ZHANG HONG-QING  , LIN GANG  ,   (1)大连理工大学数学科学研究所，大连  116024; (2)交通部第一航务工程勘察设计院，天津  300222
Published: November 2020

It is well known that three kinds of soliton solutions have been found to the nonlinear coupled scatar field equations. In this paper we continue to present five other kinds of exact solutions by using some appropriate function transformations. Applications of these results to other well-known equations in physics are also discussed.
TIME EVOLUTION AND SQUEEZED STATES OF A TIME-DEPEDENT OSCILLATOR SYSTEM
Authors: DANG LAN-FEN  ,   河北大学物理系，保定  071002
Published: November 2020

In this paper are discussed the time evolution and squeezed states of a time-depedent oscillator system. We obtain closed formulas for the time evolution of quantum states and the evolution operator of the system by selecting proper Hermitian invariant operator. We derive the condition generating squeezed states and obtain that the drive part does not influence the squeezed states of the system.
AN EXPERIMENTAL PROOF FOR THE SCALING LAW OF LYAPUNOV EXPONENT IN TYPE V INTERMITTENCY
Authors: FAN JIAN-PING  , HOU YU-QING  , WANG YING-MEI  , HE DA-REN  , WU SHUN-GUANG  ,   (1)西北大学电子科学系，西安  710069; (2)西北大学物理系，西安  710069; (3)扬州大学师范学院物理系，扬州  225002; (4)中国科学院上海光学精密机械研究所，上海  201800
Published: November 2020

This paper reports the experimental evidence for the scaling law of Lyapunov exponent in type V intermittency obtained in an electronic relaxation oscillator. The results are in very good agreement with the numerivcal computations conducted with the theoretical model of the oscillator.
EFFECTS OF STRUCTURAL TRANSITION ON THE ELECTRICAL AND MAGNETIC PROPERTIES IN LIGHTLY DOPED La1-xSrxMnO3 PEROVSKITE
Authors: ZHANG FU-XIANG  , HE DUAN-WEI  , ZHANG XIANG-YI  , XU YING-FAN  , WANG WEN-KUI  ,   (1)中国科学院物理研究所，北京  100080; (2)中国科学院物理研究所，北京  100080;北京理工大学机电工程系，北京  100081
Published: November 2020

A structural transition from rhombohedral to cubic phase occurred in the lightly doped La1-xSrxMnO3 under high temperature and high pressure. The samples changed from an insulated (polaron ordering) state to metallic state after the phase transition. At the same time, the long-range ferromagnetic ordering of the spins of localized Mn ions collapsed into the spin glass state with only short-range ordering when the temperature decreased. The change of properties was due to the variation of Mn—O—Mn bond angle and Mn—O bond length during the structural transition.
A DOPING METHOD FOR QUANTITATIVE X-RAY DIFFRACTION PHASE ANALYSIS OF SAMPLES CONTAINING AMORPHOUS MATERIAL
Authors: CHU GANG  ,   抚顺石油学院应用化学系，抚顺  113001
Published: November 2020

A new approach for quantitative X-ray diffraction phase analysis of a powder mixture has been developed using the doping method proposed by Popovic.Two cases of known and unknown mass absorption coefficients of amorphous materials are discussed.The weight fraction of amorphous material or unidentified phases can be obtained by this method.For the determination of multicomponent system containing n phases,in which (n-2) pure phases are deliberately added,the weight fractions of all n phases can be determined.The procedure has been tested by using four-to five-component samples,the analysis results agree well with the theory.
EFFECT OF PHONON-ELECTRON COUPLING ON THE SURFACE WAKE POTENTIAL
Authors: MENG XIAN  , WANG YOU-NIAN  ,   大连理工大学三束材料改性国家重点实验室，大连  116023
Published: November 2020

The wake potential and energy loss of a swift ion moving parallel to a heavily doped semiconductor surface in vacuum are studied with the specular-reflection model and the dielectric response theory. The phonon-electron coupling effect on the surface wake potential and the energy loss is investigated by using a frequency-dependent dielectric function. We find that there are two branches of phonon-electron coupling excitations which contribute to the wake potential and the energy loss. Numerical results show that the oscillation form of the wake potential is obviously influenced by the phonon-electron coupling effect.
THE ABSOLUTE ELASTIC DIFFERENTIAL CROSS-SECTIONS OF 2500eV ELECTRONS SCATTERED BY RARE GAS ATOMS
Authors: FENG REN-FEI  , WU SHU-LAN  , JI QING  , ZHU LIN-FAN  , LIU XIAO-JING  , XU KE-ZUN  ,   中国科学技术大学近代物理系，合肥  230026
Published: November 2020

The relative elastic differential cross-sections(EDCSs) of 2500eV electrons scattered by helium,neon and argon atoms were measured at a scattering angle range of 4°—15°.The absolute values of these EDCSs were obtained by normalizing the relative values to the known generalized oscillator strengths.The final results were compared with previous experimental and theoretical results.
DESIGN OF THE HIGH-Tc dc-SQUID MAGNETOMETER WITH A RESISTIVELY SHUNTED INDUCTANCE
Authors: CHEN YING-FEI  , S.ZAREMBINSKI  ,   中国科学院物理研究所与凝聚态物理中心，超导国家重点实验室，北京  100080
Published: November 2020

The properties of dc-SQUIDs with a resistively shunted inductance(Rdc-SQUID) were theoretically analyzed. The dependencies of Sv,S1/2,and dv-/da on the bias current ib for Rdc-SQUID were presented. The advantages of the high-Tc dc-SQUID magnetometer with using Rdc-SQUID have been discussed. A chip of high-Tc dc-SQUID magnetometer with modulation parameter β=4 and damping parameter γ=0.5 was designed under the conditions of the depositing and lithographic technology in laboratory. A gold thin film (≈50nm thickness and 10μm width) was deposited on the superconductive loop as the damping resistance. The theoretical values of S1/2Φ and S1/2B for the magnetometer are respectively 2.4×10-6Φ0/Hz and 200fT/Hz. Comparing the properties between dc-SQUID and Rdc-SQUID,the experimental value S1/2B,which is about 400 fT/Hz,for the magnetometer directly coupling with a 8 mm- input coil was estimated.
CONDITIONAL STABILITY OF THE GENERAL KdV SOLITON SOLUTION AND KdV-BURGERS TRAVELING WAVE SOLUTION
Authors: LI CHAO-HONG  ,   湖南师范大学物理系，长沙  410081
Published: November 2020

For a general KdV soliton solution and a general KdV-Burgers traveling wave solution,the direct perturbation method is used to construct their general perturbed corrections.Theoretical analysis reveals that the solution possesses conditional stability,namely,their stability depends sensitively on the physical parameters and initial conditions of the corresponding system.The results have extended and corrected some assertions of instability in the recent articles.
ADIABATIC TRANSITION TRANSFER PHENOMENON OF ELECTRONS AND THE QUANTUM STATISTICAL PROPERTIES OF LIGHT FIELD IN A KERR MEDIUM
Authors: LAI YUN-ZHONG  , LI WEI-DONG  , LIANG JIU-QING  ,   (1)山西大学物理系，太原  030006; (2)太原重型机械学院基础部，太原  030024
Published: November 2020

We first derive the state vector of a cascade three-level atom interacting with pair coherent states in a kerr medium.It is shown by numerical calculations that the Kerr effect results in the adiabatic transition transfer phenomenon of electrons,and the superstructures in the long-time behavior of the quantum statistical properties of light field appear.
POLOIDALLY SPIN UP GENERATED BY ELECTRON CYCLOTRON RESONANCE HEATING IN CORE TOKAMAK PLASMAS
Authors: LIU CAI-GEN  , QIAN SHANG-JIE  , WAN HUA-MING  ,   (1)核工业西南物理研究院，成都  610041; (2)南昌航空工业学院，南昌  330034
Published: November 2020

A new approach is presented to produce core plasma poloidal rotation during electron cyclotron resonance heating (ECRH) in Tokamaks. The physical mechanism employed here is as follows:in a Tokamak plasma with high power ECRH, the resonance particle localization causes poloidal electric field, which consequently induce a poloidally asymmetric ion profile. This kind of poloidal ion accumulation would overwhelm the damping of poloidal rotation from the magnetic pumping, and make the plasma spin up poloidally. Based on the fluid equations and the drift kinetic equation, we have derived the criterion of plasma spin up in the collisionless region. It is shown that the core plasma poloidal rotation can be generated by ECRH in the practical rf power level.
RESONANT X-RAY DYNAMICAL DIFFRACTION METHOD FOR DETERMINING TEMPERATURE FACTOR
Authors: XU ZHANG-CHENG  , GUO CHANG-LIN  , ZHAO ZONG-YAN  , XU JIA-YUE  , ZHOU SHENG-MING  , QI ZE-MING  , T. FUKAMACHI  , R. NEGISHI  , T. NAKAJIMA  ,   (1)安徽大学物理系，合肥  230039; (2)日本高能物理研究所同步辐射光实验设施，筑波，305; (3)日本琦玉工业大学电子系，琦玉，冈部，369-02; (4)中国高等科学技术中心(世界实验室)，北京  100080;中国科学院上海硅酸盐研究所，上海  200050; (5)中国科学院上海硅酸盐研究所，上海  200050
Published: November 2020

A new method for determining the separate temperature factors (STF) for different atoms in two-atom compound crystals is put forward. Using the characteristics of resonant X-ray dynamical diffraction by perfect crystals near the atomic absorption edge,two equations of STF are derived. As the parameters in the equations can be obtained from experimental measurement and theoretical calculation, STF can be determined by solving the equations. We applied this method to a perfect crystal GaAs at 300K, and obtained BGa=0.4573×10-20m2,BAs=0.7339×10-20m2. This method may be extended to the cases of multi-atom compound crystals.
ORIENTED GROWTH OF LiNbO3 THIN FILMS ON AMORPHOUS SUBSTRATES IN A LOW ELECTRIC FIELD
Authors: WU ZHUANG-CHUN  , HU WEI-SHENG  , LIU JUN-MING  , WANG MU  , LIU ZHI-GUO  ,   南京大学固体微结构物理国家重点实验室，南京  210093
Published: November 2020

Both the strength of an applied biased electrical field and the substrate temperature were found to have significant effect on the oriented growth of LiNbO3 thin films prepared by pulsed laser deposition technique.At a substrate temperature of 600℃ and an applied electrical field of 7V/cm,completely (001) oriented LiNbO3 films were deposited on silica and other amorphous substrates successfully.The physical background of the oriented growth of ferroelectrical films induced by low electric field was analyzed in terms of nucleation and growth theory of ferroelectrics with spontaneous polarization in electrical field and the deposition temperature effect on the intensity of spontaneous polarization of the ferroelectrics.
EFFECT OF HIGH-PRESSURE ANNEALING ON MICROSTRUCTURAL TRANSFORMATION OF NANOTUBES
Authors: ZHANG MING  , HE DUAN-WEI  , XU YING-FAN  , WANG WEN-KUI  , LIANG JI  , WEI BING-QING  , WU DE-HAI  ,   (1)清华大学机械工程系，北京  100084; (2)清华大学机械工程系，北京  100084;中国科学院物理研究所，北京  100080; (3)中国科学院物理研究所，北京  100080
Published: November 2020

The microstructural transformations of carbon nanotubes under high-pressure annealing have been studied by high resolution transmission electron microscopy. It is found that under 5.5GPa the microstructure of nanotubes has obviously changed at an annealing temperature of 770℃, while onion-like and ribbon-like structures formed at 950℃. The transformation from carbon nanotubes into quasi-spherical onion occurs in several steps, first the shells of nanotubes collapse, then spheres form and finally onion-like structures appear. The effects of high pressure and annealing temperature on microstructural changes are discussed.
STABILITY OF THE LARGE BIPOLARONS IN TWO AND THREE DIMENSIONS
Authors: REN YU-HANG  , CHEN QING-HU  , SHA JIAN  , JIAO ZHENG-KUAN  ,   浙江大学物理系，杭州  310027
Published: November 2020

The large bipolaron in two and three dimensions is investigated by combining anapproximate wave functions for the relative motion and the modified Lee-Low-Pines variational method. The values of the critical coupling constant αc above which bipolarons may exist and the critical ratio of dielectric constants ηc below which bipolarons may exist are evaluated, which are very close to the recent results obtained within a totally different variational approach. In addition, the stability region of bipolarons in the 1/α,η plane is clearly plotted. It is also found that low dimensional materials are more favorable for the formation of bipolarons.
ELECTRON TUNNELING AND NEGATIVE DIFFERENTIAL RESISTANCE OF MIM LIGHT-EMISSION TUNNEL JUNCTION
Authors: YU JIAN-HUA  , SUN CHENG-XIU  , WANG MAO-XIANG  , ZHANG YOU-WEN  , WEI TONG-LI  ,   (1)东南大学电子工程系，南京  210096; (2)东南大学物理系，南京  210096
Published: November 2020

We have observed that the apparent negative differential resistance(NDR) comes out in I-V characteristic curves of metal-insulator-metal(MIM) thin film tunnel junction when light-emission from this structure occurs in the experiments.The mechanism of this NDR is that the surface plasmon polariton(SPP),which plays a role of intermediate in the process of light-emission,creates the impeding effect upon tunneling electrons.We have also built the circuit simulation of electron-transfer, computed the numerical solution of I-V characteristic curve,and revealed the key action of SPP on the NDR in I-V characteristic curve and the light-emission from MIM tunnel junction.
THE HOMOGENEOUS BALANCE METHOD FOR SOLVING NONLINEAR SOLITON EQUATIONS
Authors: FAN EN-GUI  , ZHANG  HONG-QING  ,   大连理工大学数学科学研究所，大连  116024
Published: November 2020

The homogeneous balance method is very effective for finding exact solutions of nonlinear soliton equations.But only soliton-type solutions can be obtained.In this paper we improve some key steps in this method,then by using modified homogeneous balance method we are able to obtain some new families of exact solutions to nonliear soliton equations.Solitary wave solutions are merely a special case of one famility.
ENERGIES, FINE STRUCTURES AND LIFETIMES OF THE 2s2s2p2P0 AND 2s2p2p2D HOLLOW LITHIUM-LIKE SYSTEMS
Authors: GOU BING-CONG  ,   北京理工大学应用物理系，北京  100081
Published: November 2020

The energies , fine structures and lifetimes of the 2s2s2p2P0 and 2s2p2p2D triply excited states of the Li isoelectronic sequence are calculated using multichannel saddle-point and saddle-point complex-rotation methods. A restricted variational method is used to extrapolate a better nonrelativistic energy. The relativistic corrections are calculated with first-order perturbation theory. The shifts and widths are studied with one open channel at a time as well as fully coupled open channels. The radiative transition rates and the fine-structure splittings for the 2P0 and 2D states are also calculated. These results are compared with the existing theoretical and experimental data in the literature.
STUDY OF B+-IMPLANTED HgCdTe UNDER RAPID THERMAL ANNEALING
Authors: LIU JIA-LU  , ZHANG TING-QING  , FENG JIAN-HUA  , ZHOU GUAN-SHAN  , YING MING-JIONG  ,   (1)电子工业部第11研究所，北京  100015; (2)西安电子科技大学微电子研究所，西安  710071
Published: November 2020

Hg loss of B+-implanted HgCdTe with and without a ZnS film under rapid thermal annealing(RTA) has been analysed by secondary ion mass spectroscopy and Auger electron spectroscopy in detail- The temperatures for RTA are 300, 350 and 400℃, and the duration is 10s- The thickness of ZnS film is 160nm- Results obtained show that the surface layer of HgCdTe with a ZnS film does not show Hg loss after RTA (300℃,10s)- The procedure of RTA for B+-implanted HgCdTe forming N+-P junction has been optimized- It was shown that RTA carried out after the lithography of the metal electrode can improve the junction characteristics-
THE M?BIUS INVERSION TRANSFORM FOR HCP STRUCTURE AND THE PAIR POTENTIAL IN MAGNESIUM
Authors: LI MI  , ZHANG ZHI-GUANG  ,   (1)北京科技大学物理系，北京  100083; (2)北京理工大学应用物理系，北京  100081
Published: November 2020

In this paper a Mbius inversion transform formula is proposed and proved for a crystal with hcp structure.By the use of the formula the pair potential can be converted from the cohesive energy.As an example,the pair potential in magnesium is calculated and discussed.
ELECTRON-NEON SCATTERING AT 10—100eV
Authors: JIN SHI-QI  , XU  ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所强光光学开放研究实验室，上海  201800
Published: November 2020

We have studied the electron-neon scattering in the range of projectile energies form 10 to 100eV,presented the differential cross sections of scattering from the ground state to n≤4 states.
STUDY OF USING PENDANT DROP TECHNIQUE IN LANGMUIR-BLODGETT FILMS
Authors: PU XIAO-YUN  , LIU QING-JU  , ZHANG ZHONG-MING  , LIN LI-ZHONG  ,   云南大学物理系，昆明  650091
Published: November 2020

The pendant drop technique has been used to compress and expand the monolayer film,both the surface density of surfactant molecules and surfactant orientation on the surface of a pendant drop can be determined with polarized fluorescent image for the surfactant molecules which has a chromophore-The experiment on octadecyl Rhodamine B(ODRB) molecules shows that:(1) The surface density of ODRB follows the formula σ/σ0=(D0/D)2 in the compressing process-(2) The ODRB molecules are absorbed on the surface of pendant water drop in the way of lying flat-(3) The pendant drop method is a reliable and convenient technique for compressing the surface density of surfactant molecules-
THE ENERGY LEVELS AND OSCILLATOR STRENGTH OF A COMPLEX ATOM——Au50+ IN ASELF-CONSISTENT POTENTIAL
Authors: FENG RONG  , ZOU YU  , FANG QUAN-YU  ,   (1)北京应用物理与计算数学研究所，北京  100088; (2)中国工程物理研究院北京研究生部，北京  100088
Published: November 2020

The effects of free electrons in a plasma on a complex atom are discussed, here we are interested in the target ionAu50+ in inertia confined fusion(ICF). The results are compared with those in the case of hydrogenic ions. Accurate numerical solutions have been obtained for Schrdinger's equation through Debye screened Hartree-Fock-Slater self-consistent potential. Solutions have been computed for 28 eigenstates, 1s through n=7, l=6,yielding the energy eigenvalues for a wide range of Debye screening length Λ. As in the case of hydrogenic ions, under screening, all energy levels are shifted away from their unscreened values toward the continuum, that is, the ionization limits are shifted downward. Conclusions have been made that when Λ＞5a0， that is, in the weak screening case, Debye screening has little effect on oscillator strength, average obital radius, transition matrix elements, etc., of Au50+. For each (n,l) eigenstate, there is a finite value of screening length Λ0(n,l), for which the energy becomes zero. When Λ is sufficiently small, level crossing appears at high n satets. Optical oscillator strength for Au50+ has also been calculated, the results are compared with those under unscreened potential.
MAGNETOCRYSTALLINE ANISOTROPY OF Er2(Fe1-xCox)15Ga2 COMPOUNDS
Authors: ZHANG LI-GANG  , SHEN BAO-GEN  , ZHANG SHAO-YING  , ZHANG HONG-WEI  ,   (1)武汉冶金科技大学，武汉  430081; (2)中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京  100080
Published: November 2020

Structural and magnetic properties of Er2(Fe1-xCox)15Ga2 compounds with x=0-1.0 were investigated by means of X-ray diffraction and magnetization measurements.X-ray diffraction patterns demonstrate that all samples are single phase with the hexagonal Th2Ni17-type structure.The lattice parameters a,c and the unit cell volumes V are found to decrease linearly with increasing Co concentration.With increasing Co content the saturation magnetization decreases while,but the Curie temperature increases monotonically.The substitution of Co for Fe has a significant effect on the magnetocrystalline anisotropy,and changes the easy magnetization direction from the basal plane to the c-axis at room temperature for x lying between 0.2 and 0.4.The spin reorientation transitions are observed for x＜0.5.The spin reorientation temperature Tsr increases with increasing Co concentration from 127.8K for x=0 to 558K for x=0.4.
SPACE-TIME EVOLUTION OF HIGHLY EXCITED NUCLEUS FROM 40Ar+197Au REACTIONS AT 25MeV/NUCLEON
Authors: HE ZHI-YONG  , JIN GEN-MING  , LI ZU-YU  , DUAN LI-MIN  , DAI GUANG-XI  , WU HE-YU  , ZHANG BAO-GUO  , WEN WAN-XIN  , QI YU-JIN  , LUO QING-ZHENG  , WANG HONG-WEI  , WANG SU-FANG  ,   中国科学院近代物理研究所，兰州  730000
Published: November 2020

The emission time extracted from two-particle relative-momentum correlation functions has been studied as a function of the spatial extent of the source for 40Ar+197Au reaction at 25MeV/u.Reduction of ～50% in the mass number of the source has a very small effect on the calculated correlation functions and the extracted emission time.For the cases of short emission time τ(τ≤100fm/c),use of a smaller nuclear density would lead to somewhat smaller assignment for τ;therefore,these τ values extracted in the normal nuclear density can be taken as upper limits of τ values.For the cases of long emission time (τ≥300fm/c),the emission times do not vary with the size of the source and these τ values can be taken as the real values.
UTILIZATION OF DRIVING SUBSYSTEMS TO CONSTRUCT SYNCHRONIZATION WITH CHAOTIC SIGNALS
Authors: LIU YU-HUAI  , MA JUN  , LU YI-QUN  ,   中国科学院安微光学精密机械研究所，合肥 230031
Published: November 2020

The model of driving Lorenz systems is examined in the case that there are some parameter differences between the drive system and the response system. It is found that the strict synchronization does not exist although the parameter difference is small. We also explore the dynamic behaviors of a stable laser system driven by the chaotic signal, and we show that there is no synchronization between the drive and the response. However, this leads to the concepts of driving two subsystems with the chaotic signal, and leads to the synchronization among the subsystems. We apply these ideas to the laser subsystems,and the synchronization of the two laser subsystems, which are of different parameters and driven by the x component of the Lorenz system, is presented.
PHASE-DEPENDENCE OF HIGH-ORDER HARMONIC SPECTRA WITH ULTRASHORT LASER PULSES
Authors: WANG YING-SONG  , XU ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所强光光学开放研究实验室，上海 201800
Published: November 2020

High-order harmonic spectra are obtained by numerically solving the one-dimension time-dependent Schr?dinger equation with single-active-electron approximation. The influence of the initial phase of the excitation field on the single-atom high harmonic generation is analysized through Gabor analysis of the acceleration of the atomic dipole. The influence of the initial phase on the process of the high harmonic generation stronger for the shorter-duration pulses than for the longer case. A pulse train or a single pulse of subfemtosecond level could be obtained by high harmonic generation through the adjustment of the phase of the excitation laser field.
WAVELET BASE CONTROL FOR CHAOS MOTION
Authors: WANG ZHONG-YONG  , CAI YUAN-LI  , JIA DONG  ,   (1)西安交通大学自动控制系，西安  710049; (2)郑州大学电子工程系，郑州  450052
Published: November 2020

Based on the property that the wavelet can approximate any nonlinear continuous function in the compact supporting set,a new method is presented to control chaos.By this method the trajectories of some typical chaotic systems,such as Duffing equation,Lorenz model,etc.,are controlled to the target orbits or points.It is proved that the wavelet base control algorithm is feasible and control effect is better.
SPIN-PEIERLS TRANSITION OF THE ANTIFERROMAGNETIC CHAIN
Authors: WANG ZHI-GUO  , DING GUO-HUI  , XU BO-WEI  ,   上海交通大学应用物理系，上海  200030
Published: November 2020

By using the Fermi-Bose transformation, the antiferromagnetic chain is mapped into the bosonic field, and the energy density of the ground state and the excite states of the model are given. The relationship between the energy density of the ground state and the strength of distortion of the model is obtained. The results show that there exists a spin-Peierls transition in the model. Finally, the numerical simulation is performed to verify the above theoretical prediction.
RESEARCH OF ELECTRON RESONANT TUNNELING AND LIGHT EMISSION PROPERTIES OF DOUBLE-BARRIER TUNNER JUNCTION
Authors: WANG MAO-XIANG  , SUN CHENG-XIU  , SHI XIAO-CHUN  , YU JIAN-HUA  ,   东南大学电子工程系，南京  210096
Published: November 2020

The Cu-Al2O3-MgF2-Au double-barrier tunnel junction has been fabricated. In this structure the electron resonant tunneling occur when a bias voltage is applied because of the existence of a series of separated energy levels in the barrier.Together with the analysis of I-V characteristics of the junction, the light emission properties have been discussed in detail.It shows that the light emission efficency,light emission stability etc,have been improved greatly.The light emission spectrum shifts towards short wavelength region as compared with that of the single-barrier metal/insulator/metal junction.
STUDY ON THE PRINCIPLE OF THE VISCOSITY MEASUREMENT OF LIQUIDS WITH A FORCED-VIBRATION TORSION PENDULUM
Authors: CHEN GANG  , ZHU ZHEN-GANG  , SHUI JIA-PENG  ,   中国科学院固体物理研究所内耗与固体缺陷开放研究实验室，合肥  230031
Published: November 2020

The principle of the viscosity measurement of liquids with a forced vibration torsion pendulum is studied in this paper-The parameters of the testing system was determined by a 3-parameter model containing a Voigt unit,and the feasibility of the corresponding 4-parameter model of the measuring system,in which a liquid sample has been introduced to measure its viscosity,is then verified-It is proposed,based on the experimental results,that the measuring system is reliable-
DYNAMICS OF TWO-PHOTON DISSOCIATION OF PCl3 IN THE RANGE OF 265—285nm
Authors: PEI LIN-SEN  , CHEN YANG  , ZHOU HUI  , RAN QIN  , JIN JIN  , CHEN CONG-XIANG  , MA XING-XIAO  ,   中国科学技术大学化学物理系，合肥  230026
Published: November 2020

The dynamics of photon-dissociation of PCl3 in the range of 265—285nm was studied by using tunable dye laser. The measured emission spectra are similar in this excitation range, but their intensities are different. Three main peaks are observed in the range of 380—520nm in the emission spectrum. The strongest peak is at 43lnm, the other two weaker peaks are at 389 and 488nm, respectively. It is suggested that the peak at 488nm is from the transition of PCl(A) to PCl(X), and the peaks at 431 and 389nm are from the transitions of a new singlet state PCl(c?) to PCl(b) and PCl(a), respectively.
MONTE CARLO SIMULATION ON ELECTRON INTERVALLEY TRANSFER PROCESS IN ZnS-TYPE THIN-FILM ELECTROLUMINESCENT DEVICES
Authors: ZHAO HUI  , WANG YONG-SHENG  , XU ZHENG  , XU XU-RONG  ,   北方交通大学光电子技术研究所，北京  100044
Published: November 2020

Based on the calculation about intervalley scattering rates in ZnS, intervalley transfer process in ZnS-type thin-film electroluminescent devices is investigated through Monte Carlo simulation. The transient process of intervalley transfer, the influence of electric field on intervalley distribution and the electron kinetic energy distributions in different valleys are obtained. We propose that high valley could store energy. These results could be used as the basic data on the study of electroluminescent process.
THE STUDY OF LASER-INDUCED LOCAL HEATING OF MO MULTILAYER
Authors: ZHOU JIAN  , XUN KUN  , LIU SHI-YONG  , SHEN DE-FANG  ,   中国科学院上海冶金研究所，上海  200050
Published: November 2020

For a TbFeCo quadrilayer illuminated by laser beam,absorption of the laser power within different layers was considered by analysizing the rate of absorption of energy per unit volume.With the help of implicit method,the profile of temperature of the multilayer was given and the diffusion of heat was studied.The effect of laser power,laser duration and the convection loss at the front surface upon the thermal characteristics of the multilayer was investigated.This thermal analysis procedure provided a good example for the thermal investigation within other optical disk systems.
ELECTRON DYNAMICS IN THE EXTRA-INTENSE STATIONARY LASER FIELD
Authors: KONG QING  , ZHU LI-JUN  , WANG JIA-XIANG  , HUO YU-KUN  ,   复旦大学基于加速器的原子物理和原子核物理开放研究实验室，现代物理研究所，上海  200433
Published: November 2020

Electron dynamics in the extra-intense stationary laser field has been investigated by numerical simulation method.It is found,for the first time to our knowledge,that when Q100(Q=eE/mecω,is a dimensionless parameter measuring the field intenstiy),the electron with relatively lower energy can be captured and violently accelerated by the laser beam.This is a new phenmenon which is of potential importance to the far-field laser acceleration in vacuum.
REALIZATION OF A SPIN-TYPE GHZ STATE VIA THE JAYNES-CUMMINGS MODEL WITH LARGE DETUNING
Authors: SONG KE-HUI  , GUO GUANG-CAN  ,   (1)湖南省怀化师范高等专科学校物理系，怀化  418008；中国科学技术大学物理系和非线性科学中心，合肥  230026; (2)中国科学技术大学物理系和非线性科学中心，合肥  230026
Published: November 2020

Realization of a spin-type Greenberger-Horne-Zeilinger state via the Jaynes-Cummings model with large detuning is presented.The contradiction to local hidden variable theory is made through measuring the parity of the cavity fields. This scheme does not violate Bell's inequality.
MULTI-VARIABLE FEED-BACK CONTROL OF PLASMA CURRENT AND HORIZONTAL POSITION IN HT-7 SUPER-CONDUCTIVE TOKAMAK
Authors: FU PENG  , LIU ZHENG-ZHI  , LUO JIA-RONG  , XIA HAI-YAN  ,   中国科学院等离子体物理研究所，合肥  230031
Published: November 2020

In the analysis of HT-7 superconductive tokamak which consists of iron core, thick copper shell and multi-coupling coils system, the electromagnetic parameters are linearized by a novel method; the copper shell is replaced by an equivalent pair of coils in series-opposing; and the multi-coupling is compensated by an intermediate state variable. As a result, the plasma control equation can be set up and solved more simply and easily. The feed-back control system has been designed and rather good results were obtained in experiment. This feed-back control system has high response speed, less computing time and is easy to carry out.
SECOND-ORDER OPTICAL NONLINEARITY INVESTIGA-TION ON THE GELLING PROCESS OF ORGANIC-DOPED SILICA FILM
Authors: LIU LI-YING  , XU LEI  , HOU ZHAN-JIA  , XU ZHI-LING  , CHEN JIE  , WANG WEN-CHENG  , LI FU-MING  ,   复旦大学物理系，三束材料改性国家重点联合实验室，上海  200433
Published: November 2020

The gelling process of organic-doped silica film fabricated by sol-gel technique was investigated by using in situ second harmonic generation (SHG) measurement.SHG signal came from the doped hemicyanine molecules which automatically oriented in the film.We found that the SHG measurement can be used as a semi-quantitatively probe of the gelling process.The time of gelling was found to depend sensitively on the annealing temperatures.Film shrinkage during gelling resulted in disordering of the doped hemicyanine molecules,consequently,SHG intensity decreased during annealing.