bluuebunny/crossref_metadata_2025 huggingface dataset:
INTRINSIC ABSORPTION OF Hg1-xCdx TE
Authors: LI BIAO  , CHU JUN-HAO  , CHANG YONG  , GUI YONG-SHENG  , TANG DING-YUAN  ,   中国科学院上海技术物理研究所红外物理国家实验室,上海200083
Published: November 2020

The intrinsic absorption spectra of Hg1-xCdxTe semiconductor with energies above the band gap are presented by analyzing experimental results, Kane theory and some empirical laws. It is found that Anderson's theorical expression derived from the Kane model and Chu et al' s empirical rule obtained from the measured data agree well with the intrinsic optical absorption behaviour of Hg1-xCdxTe bulk thin films. Moreover, the intrinsic absorption of Hg1-xCdxTe epitaxial layer is discussed.
THE AVERAGE ANGULAR MOMENTUM IN HEAVY-ION INDUCED FUSION REACTION BY OFF-LINE γ TECHNIQUE
Authors: QIAN XING  , JIANG DONG-XING  , LIN JUN-SONG  , LIU DA-MING  , LI ZE  ,   (1)北京大学技术物理系,北京100871; (2)中国原子能研究院,北京102413
Published: November 2020

Partial cross sections of two-and three-neutrons evaporation channels following the fusion reaction 12C+93Nb have been measured for center-of-mass energies from 25.0 to 40.5 MeV by off-line γ technique. The total fusion cross sections and average angular momenta as a function of energy have been deduced from these cross sections on the basis of statistical evaporation model calculation( CAS CADE). The fusion cross sections are well reproduced by the simplified coupled channel model (CC FUS). The average angular momenta deduced from the partial cross section ratios are consistent with that extracted from the CCFUS calculation.
THEORETICAL ANALYSIS OF DYNAMIC NONLINEAR ABSORPTION IN PHOTO ISOMERIC MOLECULARS
Authors: WU PENG-FEI  , TANG GUO-QING  , ZHANG GUI-LAN  , CHEN WEN-JU  ,   南开大学现代光学研究所,天津300071
Published: November 2020

The dynamical behavior of nonlinear absorption in photoisomeric molecular with two ismoers was discribed theoretically. And the various factors influencing the dynamic nonlinear absorption properties were analyzed and discussed.
ELECTRONIC STATES OF QUANTUM DOTS SUBJECTED TO A MAGNETIC FIELD
Authors: GUO JIANG-MING  , RUAN WEN-YING  , LIU YOU-YAN  ,   华南理工大学物理系,广州510641
Published: November 2020

The few-body theory has been extended to study the electronic properties of the quantum dots subjected to a magnetic field, which contains three electrons. We have analytically proved that the "magic angular momenta" are orginated from the symmetries of the quantum mechanics. Based on the few-body theory, calculations confirm the conclusion stated above. The influences of magnetic field and confined potential on the ground states of three electron systems has been numerically calculated.
THEORETICAL ANALYSES OF A DOPPLER TYPE ATOMIC INTERFEROMETER
Authors: XU XIN-YE  , WANG YU-ZHU  ,   中国科学院上海光学精密机械研究所量子光学(联合)开放研究实验室
Published: November 2020

Based on the analyses of a moving three-level atom interacting slantingly with a standing wave laser field, two kinds of atomic interferometries are designed. The coherent splitting, deflection, combination and free propagating of the atomic waves in the two atomic interferometers are studied in detail.The results show that the interference effects resulting from interaction between different internal states of the atom will occur when some conditions are met by both the atom and the light field. Finally, we have analysed theoretically how to realize and demonstrate the-atomic interferometry by using the two methods.
FERMI RESONANCES AND VIBRATIONAL SPECTRUM FOR METHANE
Authors: HOU XI-WEN  , XIE MI  , MA ZHONG-QI  ,   (1)中国科学技术大学研究生院; (2)中国科学院高能物理研究所; (3)中国科学院高能物理研究所;湖北三峡学院物理系
Published: November 2020

The boson realization model with Fermi resonances is used for explaining both stretching and bending vibrational spectra in methane. The interactions between stretching and bending vibrations are described by Td symmetric Fermi resonance terms that couple one creation (or annihilation) operator of stretching vibrations with two annihilation (or creation) operators of bending ones. This model provides a ten-parameter fit to the published experimental vibrational- eigenvalues of methane with the root-mean-square energy deviation 12.38cm－１.
ENERGY－ LEVEL－EXCITATIONS——THE ELEMENTARY EXCITATIONS IN THE CRYSTAL-OPTICAL- FIELD STRONG-COUPLED SYSTEM
Authors: DUAN LU-MING  , GUO GUANG-CAN  ,   中国科学技术大学物理系
Published: November 2020

It is found that a new kind of excitations,the energy-level-excitations,exist in a narrow-band crystal which strongly couples to the optical field. The energy spectrum and some other properties of the energy-level excitations are analyzed.
WAVEBREAKING DUE TO RESONANT ABSORPTION IN PLASMAS PRODUCED BY LASER BEAM
Authors: LIU DA-QING  , CAO LI-HUA  , CHANG WEN-WEI  , YUE ZONG-WU  ,   国防科技大学应用物理系
Published: November 2020

Wavebreaking due to resonant absorption in plasmas produced by the laser beam is studied using theoretical analysis and particle simulation of plasma.The temperature effects on wavebreaking and resonant absorption are also considered.It is indicated that those electrons in the resonant region are not only oscillating heated,but also accelarated by Landau damping.There exists a turbulence accelaration mechanism in underdense plasma region.Second wavebreaking can also be observed in certain power density of laser light.
THERMOELECTRIC POWER PROPERTIES OF QUASI TWO DIMENSIONAL POTASSIUM/SODIUM PURPLE BRONZE- CRYSTALS A0.9MoO17(A=K,Na)
Authors: TIAN MING-LIANG  , MAO ZHI-QIANG  , WANG RUI-PING  , WANG YE-BIN  , ZHANG YU-HENG  ,   中国科学技术大学结构分析开放研究实验室
Published: November 2020

Temperature dependence of thermoelectric power S in quasi-two dimensional potassium/sodium purple bronzes has been studied in the temperature range 80—280K.It′s found that:(1)in potassium purple bronze,S has a sign change at 105K,above which S is the small negative value and can be described by the form of S=AT+B,the dominant carriers are free electrons,in the CDW state below 105K,S is positive,and can be described by S=A′T+B′/T,the phonon-drag of the carriers is dominant; (2)in sodium purple bronze,in the studied temperature range above 80K,S has a good linear relation with temperature,no phase transition was observed,electrons may be the dominant carriers.In addition,the origins of the difference of the properties for both these isostructural crystals are also discussed briefly.
QUASI-DIRAC EQUATION IN FREE-ELECTRON LASER
Authors: LI ZHI-KUAN  ,   承德民族师范高等专科学校物理系
Published: November 2020

In this paper,a quasi-Dirac equation is founded in Compton regime for free electron laser.The equation is solved by using an approximation method and the formula of the current density obtained corresponds to the new wave function. Our result shows that the spin influences the distributions of the wave function and the current density.
ANALYSIS OF Hα LINE SHAPE
Authors: XU WEI  , WAN BAO-NIAN  , LI JIAN-GANG  , FANG TONG-ZHENG  , FANG ZI-SHENG  , XIE JI-KANG  ,   中国科学院等离子体物理研究所
Published: November 2020

The Hα line shape has been fitted with Gaussian function. Hα intensities emitted by the hydrogen atoms,which are reflected by the limiter,and produced from hydrogen molecular dissociation and charge-exchange,were obtained. We have also obtained their incident velocity and ion temperature from Doppler broadening and Doppler shift. This paper discussed the hydrogen atom transport with a simplified model gave the profile of hydrogen atom density and emission coefficient,and analyzed the influence of incident velocity on particle confinement time. Hydrogen atom energy spectra have been also derived from the Hα line shape,It shows that the main molecular processes at the edge of the plasma are hydrogen molecular dissociative excitation and ionic dissociation.
ＱＵＡＮＴＩＺＥＤ ＣＯＮＤＵＣＴＡＮＣＥ ＩＮ ＴＨＥ ＭＥＳＯＳＣＯＰＩＣＳ-ＳＩＺＥＤ ＭＥＴＡＬＬＩＣ ＰＯＩＮＴ ＣＯＮＴＡＣＴＳ
Authors: DAI ZHEN-HONG  , SUN JIN-ZUO  , YU YA-BIN  ,   烟台大学物理系
Published: November 2020

Using a three dimensional-quasi-one dimensional-three dimensional model to depict the point contact between a scanning tunneling microscope tip and a metal crystal, by indenting the tip into a metal surface and then withdrawing we have studied the electron transport properties of the microstructure. By means of the single electron approximation and the transfer matrix method, we solve the Schr?dinger equation for this three dimensional system, and calculate the variation regularity of its conductance by quantum mechanics method. The variation of the conductance with constricting and stretching of the constriction is studied, and the quantization of the conductance in units of 2e2/h and 2×2e2/h are obtained.
PREPARATION OF FULLERENCE DOPED SILICA AEROGELS AND THE STUDY OF PHOTOLUMINESCENCE- PROPERTIES
Authors: ZHOU BIN  , WANG JUE  , SHEN JUN  , WENG ZHI-NONG  , DENG ZHONG-SHENG  , ZHAO LI  , LI YU-FEN  ,   (1)复旦大学物理系; (2)同济大学波耳固体物理研究所
Published: November 2020

This paper introduces the preparation of fullerence doped silica aerogels by “chemically doped” and sol gel process.The infrared spectra and time of flight mass spectra show that C60 were successfully incorporated into the silica aerogel and the structures were retained in the fabrication process.Photoluminescence spectra shows that fullerence doped silica aerogels exhibit broad visible light under Ar+ laser(488nm).The photoluminescence is blue shifted compared with pure C60.In this paper, we give an explanation to this blue shift.
INVESTIGATION OF THE DEFORMED CARBON NANOTUBES
Authors: WANG ZHEN-XIA  , WANG WEN-MIN  , YANG JIN-QING  , LI XIN-NIAN  , LUO WEN-YUN  , WANG CHUAN-SHAN  , XIE YI-FEN  , ZHANG LEI  ,   (1)上海大学材料科学学院; (2)上海大学上海射线应用研究所; (3)上海石油化工股份有限公司催化研究所; (4)中国科学院上海原子核研究所
Published: November 2020

In this paper,we present the experimental observation of the deformed carbon nanotubes,using transmission electron microscopy (TEM).The deformations obsorred include both the radial deformation and the axial deformation. A proposed model can explain qualitatively the occurrence of the deformations of the carbon nanotube in a deposit by arc discharge between two proximate electrodes in argon atmosphere.
SIMS ANALYSIS OF MIGRATION CHARACTERISTICS OF FLUORINE IN BF2+ IMPLANTED POLY-Si GATE UNDER CONVENTIONAL THERMAL ANNEALING
Authors: LIU JIA-LU  , ZHANG TING-QING  , LI JIAN-JUN  , ZHAO YUAN-FU  ,   (1)骊山微电子研究所; (2)西安电子科技大学微电子研究所
Published: November 2020

Distribution and migration characteristics of fluorine in poly-Si gate on BF2+ implanted poly-Si gate with an energy of 80 keV and doses of 2×1015 cm-2 under conventional thermal annealing has been analyzed systematically and deeply by SIMS.Migration of fluorine in poly-Si gate exists not only diffusion mechanism,but also absorption and emission mechanism,and experiment results are explained successfully.
STUDY ON ULTRA THIN AlGaAs LAYER ON GaAs
Authors: LIU XING-QUAN  , LU WEI  , MU YAO-MING  , QIAO YI-MIN  , CHEN XIAO-SHUANG  , WAN MING-FANG  , ZHA FANG-XING  , YAN LI-PING  , SHEN XUE-CHU  ,   中国科学院上海技术物理研究所;中国科学院红外物理国家重点实验室;中国高等微结构科技研究中心
Published: November 2020

A Series of samples of ultra thin AlGaAs films grown on GaAs(100) substrate by MBE are studied by photomodulated reflectance (PR)spectroscopy in ultra high vacuum chamber.More than one peak are observed for samples with thickness less than 35nm,but only one peak is observed for 100nm thick sample,The position and width of these peaks change with sample thickness.The experimental results are well explained by step potential model.
ELECTRON CORRELATION IN QUANTUM WELLS
Authors: WANG HONG-WEI  ,   江西省九江师范专科学校物理系
Published: November 2020

The general correlation factor for the two dimensional and the quasi two dimensional electron gas is presented based on the Bohm Pines theory.The pair correlation function,the exchange energies and the correlation energies of electrons in the AlxGa1-x As GaAs quantum wells are obtained employed the correlation basis function method.
ASTUDY ON ENCAPSULATION OF AN YTTR IUM ATOM IN CARBON CAGE USING LASER ABLATION MASS SPECTROSCOPY
Authors: DONG GUO-XUAN  , WANG SHI-LIANG  , DAI SONG-TAO  , LI CHUN-MING  , CHEN DIE-YAN  , LUO CHU-PING  , TAN HAI-SONG  , GAN LIANG-BING  , HUANG CHUN-HUI  ,   (1)北京大学稀土材料化学及应用国家重点实验室; (2)清华大学现代应用物理系
Published: November 2020

Laser ablation mass spectroscopy (LAMS) has been used to study yttrium contained fullerenes. Yttrium contained fuller enes were prepared by arc burning of Y2O3/graphite composite rods. The LAMS exper imental results confirm the presence of YC82．It was also shown that YC82 appears on the surface of the sample and that the yield of YC82 changes with the primitive weight ratio of Y2O3 to graphite in fabrication processing. In addition, the stability of YC82 in air was studied and the mechanism of YC82 formation was discussed.
PREPARATIONS AND INFRARED SPECTRUM STUDIES OF POLYTETRAFLUOROETHYLENE THIN FILMS
Authors: ZHU KAI-GUI  , SHI JIAN-ZHONG  , LI KE-BIN  , YAO WEI-GUO  , ZHANG LI-DE  ,   (1)苏州大学物理系; (2)中国科学院固体物理研究所
Published: November 2020

Polytetrafluoroethylene (PTFE) thin films have been grown successfully by rf magnetron sputtering technique. The infrared spectra of the as prepared films are consistent with those of the PTFE target. However, chains in the films become shorter than those in the bulk.
GIANT MAGNETORESISTANCE OF Fe-Ag GRANULAR FILMS
Authors: YANG XIN-E  , YANG JI-SHENG  , DONG JIAN-TAO  , CHE MING-RI  ,   天津大学应用物理系
Published: November 2020

The magnetoresistance of magnetic granular alloys has been studied based on a quantum phenomenological model.We take into account the phase interference effectamong the impurity atoms in a grain to calculate the scattering cross section between conduction electron and atom.According to the size distribution data provided by the experiment reported,we have derived an expression for the magnetoresistance depending on the grain size,size distribution,and applied magnetic field.The calculated results for the Fe-Ag sample have shown that the variation character of magnetoresistance with the external field depends on the size distribution of the grains.At a size scale D0,the magnetoresistance shows a maximum value.The size scale D0 depends on the applied field,the sample materials and fabrication conditions.
AN ALGEBRAIC DYNAMICS APPROACH TO THE SOLUTION OF THE SU(3)LINEAR NONAUTONOMOUS QUANTUM SYSTEM
Authors: ZHANG WEN-ZHONG  , WANG SHUN-JIN  ,   兰州大学现代物理系
Published: November 2020

By the method of algebraic dynamics,the exact solutions and Cartan invariant operators of the SU(3) linear nonautonomous quantum system have been obtained,the quantum-classical correspondence of the solutions established.The nonadiabatic Berry phase for a periodic system is also- calculated.
BLOCH THEOREM FOR THE EVOLUTION OF STATES IN THE CYCLIC QUANTUM SYSTEMS AND THE UNIFICATION OF RESONANT GEOMETRIC PHASES
Authors: LI BO-ZANG  , ZHANG DE-GANG  , WU JIAN-HUA  , YAN FENG-LI  ,   (1)北京大学物理系; (2)河北师范大学物理系; (3)四川师范大学固体物理研究所; (4)中国科学院物理研究所
Published: November 2020

The Bloch theorem holds also for the evolution of states in the cyclic quantum systems in which the Hamiltonian varies cyclically with time.In light of the theorem a new type of geometric phases——Bloch phases——is defined.In this paper it is shown that the resonant-(i.e.,acquired by certain states after evolving a cycle)geometric phases so far discovered can all be unified into the Bloch phases.That is,the Bloch phases are identical with the Pancharatnam phases,Aharonov-Anandan phases and Lewis-Riesenfeld phases,and reduce to the Berry phases in adiabatic approximation.To this end,the equivalent alternation of defining the former three types of quantum phases and the generalization of Lewis-Riesenfeld phases and Berry phases to the degenerate case are made.In addition,two methods are given for efficiently searching for the Bloch phases.
EMISSION TEMPERATURES OF HOT NUCLEI FROM-POPULATIONS OF PARTICLE UNSTABLE STATES AS A FUNCTION OF IMPACT PARAMETER
Authors: HE ZHI-YONG  , LI ZU-YU  , DUAN LI-MIN  , JIN GEN-MING  , WU HE-YU  , ZHANG BAO-GUO  , WEN WAN-XIN  , QI YU-JIN  , LUO QING-ZHENG  , DAI GUANG-XI  ,   中国科学院近代物理研究所
Published: November 2020

The α-α correlation at small relative angles has been measured for ４０Ar-induced reactions on 197Au at E/A=25MeV, in coincidence with two fission fragments. The relative populations of states of 8Be and emission temperature of hot nuclei are extracted from the α-α correlation function. The emission temperature changes slightly with the impact parameter, from about 4MeV for central collision to about 3.8MeV for peripheral collision. At peripheral collision, the emission temperature is observed to increase with the energy of particles.
CARRIER TRANSPORT THROUGH A SEMICONDUCTOR GRAIN BOUNDARY WITH A DOUBLE MOTT BARRIER
Authors: ZHENG ZHEN-HUA  , MIAO RONG-ZHI  , CHEN YU  ,   宁波大学物理系
Published: November 2020

Carrier transport through an n-type semiconductor grain boundary with a double Mott barrier consisting carrier depletion layers,acceptor defect layers (ACLs) on grain surface and negative-charged interface by trapping of majority carriers is studied.The effect of ACL on the barrier,current,nonlinearity and capacitance is especially treated.The change of barrier under bias governs transport properties,and ascertains the existance of pre-breakdown,breakdown and upturn regions.ACLs result in a change of barrier and its intensifying decline under bias,and thus enhance the current change and nonlinearity,and largely determine the leakage current.And ACLs reduce capacitance at high frequency by broaden barrier but increase capacitance peak originated from the resonant response of interface charge under bias.
THE EVOLUTION EQUATION OF THE CA TRAFFIC-FLOW-MODLE AND THE EFFECT OF TURNING PROBABILITY
Authors: Lü XIAO-YANG  , CHEN RUO-HANG  , LIU MU-REN  , KONG LING-JIANG  ,   (1)广西师范大学物理系; (2)华南师范大学行政学院
Published: November 2020

A group of evolution equations and a expression of the flow speed, in traffic describing a 2D cellular automaton traffic-flow model are presented.A turning probability is introduced into the model to simulate the traffic jam.The effects caused by the turning probability are abserved in computer simulation.
THE DYNAMIC FARADAY EFFECT AND IT′S-MECHANISM OF LOSSES
Authors: LIU GONG-QIANG  , ZHU LIAN-GEN  , WEI BANG-DA  , ZHANG NING-GAO  ,   (1)上海工程技术大学基础部; (2)上海交通大学应用物理系
Published: November 2020

There is evidently a difference between the dynamic and static Faraday effects in magnetooptical medium.The real part θ′t of the alternating Faraday rotation θt all is less than the real part θ′s of the static Faraday rotation θs,and the imaginary part θ″t all is bigger than the imaginary part θ″s.It is shown by the experimental result of Faraday effect in (BiTm)3(FeGa)5O12 films that the frequency dependence of θt has a direct bearing on the mechanism of magnetic lag in the high-frequency region of ω>104Hz,and is mainly depend on the magnetic hysteresis in the low-frequency region of ω≤103Hz.Even if ω→0,θt does not equal θs as a result of the magnetic hysteresis loss in the medium.It is also indicated by the theoretical analysis that it is impossible to realize completely the on off state of the switch for a modulator utilizing the magnetooptical medium with magnetic losses.
THE MOST PROBABLE APPROACH TO THE DLA MODEL
Authors: TANG GUO-NING  , WENG JIA-QIANG  , KONG LING-JIANG  ,   广西师范大学物理与电子科学系
Published: November 2020

The most probable approach is used to treat the problem of the DLA model.The most probable distribution of the particles,the fractal dimension and the screening exponent of the DLA cluster are obtained.The results agree with the computer simulation results.
STUDY OF THE TRANSPORT PROPERTIES IN Ca DOPING NdCeCuO SYSTEM
Authors: RUAN KE-QING  , CHEN XIAN-HUI  , FENG YU  , WANG CHENG-YOU  , CAO LIE-ZHAO  , JIA YUN-BO  ,   (1)中国科学技术大学结构分析开放研究实验室; (2)中国科学技术大学结构分析开放研究实验室;中国科学技术大学物理系
Published: November 2020

In order to investigate the nature of the charge carriers in NdCeCuO system, we prepared Nd1.85-xCe0.15CaxCuO4-δ and Nd2-xCaxCuO4-δ , and studied transport properties of them. With increasing Ca concentration, the sign of Hall coefficient is changed from negative to positive. The hole state in CuO2 plane arises from the lattice distortion induced by Ca doping, which leads to the- O2p band pass through the Fermi level.
DESCRIPTION OF RAMAN MAGNETIC RESONANCE SPECTROSCOPY IN WEAKLY COUPLED TWO-SPIN SYSTEM BY PRODUCT OPERATOR FORMALISM
Authors: MIAO XI-JIA  , LU GUANG  , YE CHAO-HUI  ,   中国科学院武汉物理研究所波谱与原子分子物理国家重点实验室
Published: November 2020

Raman magnetic resonance (RMR) spectroscopy in weakly coupled two-spin system (C-H spin system in CHCl3 molecule) has been investigated in detail by product operator formalism and RMR experiment, where the irradiated nucleus is proton and the detected nucleus is carbon. The theoretical results predicted by product operator formalism are in good agreement with the RMR experiment in various radio-frequency offsets and irradiation strengths applied to proton, indicating that product-operator formalism has advantages over the perturbation approximation-method and eliminates limitation of the approximation method that can be only used to describe the RMR experiment under the case of weak radio frequency irradiation. The studies also show that product operator formalism is a powerful tool for examining the RMR experiments in complex spin systems. It is found that the multiple quantum transitions are much easier to be observable with small radio frequency offsets and higher signal-to-noise ratio is obtained with the moderate irradiation strengths in RMR experiment.
AN 13C NMR STUDY OF NOVEL PHYSICAL PROPERTIES IN (DB18C6)KC60
Authors: SHAO QIAN-FEN  , CHEN JIAN  , WU TAI-LIU  , CAI RUI-FANG  , HUANG ZU-EN  ,   (1)复旦大学分析测试中心; (2)复旦大学化学系
Published: November 2020

We reported some 13C NMR experimental results in (DB18C6)KC60.The novel physical properties of this alkali mental fulleride show the magnetic ordering below 200K temperature and the enhancement of the resonant signals due to strong interaction between electron and nuclear.And the physical property of this material can be tuned dramatically by using supermolecular chemistry.
USING FINITE IMPULSE RESPONSE DIGITAL FILTER TO CONTROL CHAOS
Authors: LUO XIAO-SHU  , KONG LING-JIANG  , QU WAN-LI  ,   (1)广西师范大学物理与电子科学系，桂林  541003; (2)华中理工大学电信系，武汉  430074
Published: November 2020

Finite impulse response digital filter was used to stabilize the unstable periodic orbits (UPO) embedded in a chaotic attractor of differential dynamic system and two-dimensional map; and thus high periodic orbits was controlled. As examples we studied the Lorenz system and Henon map. A preliminary analysis and results of numerical analogy are presented. The advantages of this method are that it does not need to know the linear properities and the periodicity about a UPO or that of the UPO extracted from the chaotic attractor. The choice of control parameter is independent of the controlled chaotic system.
STUDY ON THE DAMPING CHARACTERISTICS OF FOAMED ALUMINUM
Authors: HAN FU-SHENG  , ZHU ZHEN-GANG  , SHI CHUN-YI  , WANG YUE  ,   (1)中国船舶工业总公司第725研究所，洛阳  471029; (2)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

Internal friction measurements have been performed at the different frequencies, temperatures and strain amplitudes to examine the damping characteristics of foamed aluminum. It is found that the pores contribute to the damping by raising the internal friction background, particularly the high temperature one. The other significant feature is that the internal friction is strain-amplitude-dependent, which becomes more obvious as the pore size decreases. There are inhomogeneous pores and high density of defects in the structure, leading to nonuniformly distributed stress and strain. This state will be intensified under the disturbance of applied load, making the defect density increase. The defect effects are therefore responsible for the damping characteristics of foamed aluminum.
STUDY OF ULTRAHIGH DENSITY DATA STORAGE ON ORGANIC-COMPLEX THIN FILMS
Authors: MA LI-PING  , YANG WEN-JUN  , XUE ZENG-QUAN  , CHEN HUI-YING  , PANG SHI-JIN  ,   (1)北京大学电子学系，北京  100871; (2)北京大学化学系，北京  100871; (3)中国科学院物理研究所和凝聚态物理中心北京真空物理实验室，北京  100080
Published: November 2020

Crystalline organic complex thin films have been performed by vacuum evaporation method on HOPG substrates.Using Scanning Tunneling Microscope storage,array has been made on the film by applying voltage pulses between the tip and the substrate.The recording marks are 1.3nm in diameter.Voltage-current characterization shows that the recorded region has a conductor behavior while the unrecorded regions shows an insulator behavior.It is confirmed from experiments that the distance between two recording marks can be as short as 2nm,which corresponds to the storage density of 2.5×1013bit/cm2.The mechanism about the recording is briefly discussed.
ROOM TEMPERATURE MANIPULATION OF INDIVIDUAL GLYCINE MOLECULES ADSORBED ON THE Cu(111) SURFACE
Authors: ZHAO XUE-YING  , ZHAO RU-GUANG  , GAI ZHENG  , YANG WEI-SHENG  ,   北京大学人工微结构和介观物理国家重点实验室，物理系，北京  100871
Published: November 2020

Low-energy electron diffraction (LEED) shows that glycine molecules can stick onto the Cu(100) substrate at room temperature forming ordered structures, while their binding to the substrate is fairly weak as evidenced by the quick degradation of the adsorbing structures and in turn the LEED pattern induced by the incident electron beam. Scanning tunneling microscopy (STM) observation shows that the molecules can also adsorb on the Cu(111) substrate at room temperature, and the binding is strong enough to be imaged with not too small a tunnel resistance but is weak enough to be manipulated by the tip with a small tunnel resistance. Careful inspections of the STM images allow us to further conclude the following.(i) At least three adsorption geometries with different apparent heights have been identified, although the details of the molecular images are often dominated by the tip shape.(ii) It is possible to move the molecules without changing their adsorbing geometry. (iii) In manipulation the molecules are pushed forward by the tip.(iv) Each glycine molecule forms at least two bonds with the substrate. During controllable manipulations the molecules remain at least one bond unbroken. (v) Electrostatic forces between the tip and sample do not play an important role in manipulations, as changing bias polarity seems to have almost no influences.(vi) In manipulations the higher the tunnel resistance the better our control on the molecules, as long as the molecules can be moved.
INTENSITY RELATIONSHIP BETWEEN EXCITATION AND THE STEADY-STATE PHOTOLUMINESCENCE OF FREE EXCITONS IN SEMICONDUCTOR QUANTUM WELLS
Authors: JIN SHI-RONG  , ZHENG YAN-LAN  , LIN CHUN  , ZHONG JIN-QUAN  , LI AI-ZHEN  ,   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 photoluminescence (PL) intensity of free excitons in a GaInAsSb/GaAlAsSb quantum well (QW) laser structure is investigated as a function of excitation intensity and lattice temperature.The relationship between PL intensity of free excitons and excitation intensity as well as lattice temperature in the steady-state PL measurements was developed for the quantitative descriptions of the experimental data.Calculations show that the variation of exciton relative population with excitation intensity has strong influence on the relationship between PL intensity of free excitons and excitation intensity. It is found that the linear coefficient I/I0 is actually the characterization of the exciton photoluminescence efficiency. According to our model,the background density of the quantum well material as well as the scattering time constant of the QW,in addition to the excitonic binding energy and activation energy, is also obtained by fitting the Arrhenius plot of PL intensity.
STUDY ON THE ELECTRON MOBILITY FOR EACH SUBBAND ON THE n-HgCdTe ACCUMULATED LAYER
Authors: GUI YONG-SHENG  , CHU JUN-HAO  , CAI YI  , HENG GUO-ZHEN  , TANG DING-YUAN  ,   (1)昆明物理研究所，昆明  650223; (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，上海  200083
Published: November 2020

By using quantitative mobility spectrum analysis technique, the temperature-dependent density and mobility for each subband of the accumulated layer on the n-HgCdTe devices have been determined from magnetic-field-dependent Hall and resistivity data.The results agree well with the Shubnikov-de Hass measurements and theoretical calculations.
COMPUTER SIMULATION OF THE EPITAXY GROWTH IN ULTRA-THIN FILMS
Authors: WU FENG-MIN  , ZHU QI-PENG  , WU ZI-QIN  ,   (1)浙江工业大学技术物理研究所，杭州  310014; (2)中国科学技术大学基础物理中心，合肥  230026
Published: November 2020

The aggregation in ultra-thin films is simulated.The growth morphologies,such as the fractal growth of clusters and the “step-flow”,are obtained.The relation between the density of the clusters and the bias angle of vicinal surface is analyzed,and the threshold value of step-flow and the fractal dimensions of the clusters are also calculated.The simulation results are consistent with the experiments.
DIRAC PARTICLE RADIATION FROM EINSTEIN-MAXWELL-DILATON BLACK PLANE
Authors: CAO JIANG-LING  , PENG FANG-ZHI  ,   (1)北京师范大学物理系，北京  100875; (2)三峡学院电子工程系，万县  404000
Published: November 2020

Dirac equation near Einstein-Maxwell-Dilaton black plane's event horizon is analysed and discussed.Under tortoise coordinate translation,it can be verified that there exists thermal radiation of dirac particles from the event horizon.
THEORETICAL DESCRIPTION OF HARMONICS GENERATION FOR TWO-LEVEL ATOMS
Authors: QU WEI-XING  , HU SU-XING  , XU ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所，上海   201800
Published: November 2020

The process of harmonic generation for a two-level atom is investigated theoretically.The model of oscillator driven by a nonlinear external force is used to simulate an induced porlarization of the atom,and the characteristics in harmonic spectrum of the atom are analyzed for a weak and a super-intense laser pulses.
NON-DEGENERATE TWO-PHOTON FLUORESCENCE SPECTRUM FOR TWO-LEVEL ATOM IN SQUEEZED VACUUM
Authors: HE LIN-SHENG  , FENG XUN-LI  , WU SHI-XIONG  , ZHANG ZHI-MING  , XIA YU-XING  ,   (1)合肥工业大学激光研究所，合肥  230009; (2)上海交通大学应用物理系，上海  200030; (3)西安交通大学应用物理系，西安  710049; (4)中国科学院安徽光学精密机械研究所激光光谱学开放研究实验室，合肥  230031
Published: November 2020

In this paper the master equation is derived for the atomic reduced density operator, by means of projection operator technique, starting from the Liouville equation. The nondegenerate two-photon fluorescence spectrum for an atom with two-levels in a squeezed vacuum with broad band has been studied by means of the above equation. We find that there is a new type of oscillation phenomenon, in which there are both super and lower thresholds. Between the two thresholds the atom will exhibit oscillation and the two-photon fluorescence spectrum exhibits single peak. Outside the region between the two thresholds the oscillation will not happen and the two-photon fluorescence spectrum possesses novel negative peak or peaks. The shapes of the spectra depend strongly on the natural two-photon linewidth. However, the spectra are not phase-sensitive, which is unexpected.
DEEP ELECTRON STATES IN n-TYPE Al-DOPED ZnS1-xTex GROWN BY MOLECULAR BEAM EPITAXY
Authors: LU LI-WU  , ZHANG  YAN-HUA  , GE WEI-KUN  , I.K.SOU  , Y.WANG  , J.WANG  , Z.H.MA  , W.S.CHEN  , G.K.L.WONG  ,   (1)香港科技大学物理系，香港九龙; (2)中国科学院半导体研究所半导体材料科学开放研究实验室，北京  100083
Published: November 2020

Capacitance-voltage (C-V), photoluminescence (PL) and deep level transient spectroscopy (DLTS) techniques were used to investigate deep electron states in n-type Al-doped ZnS1-xTex epilayers grown by molecular beam epitaxy (MBE). The integrated intensity of the PL spectra obtained from Al-doped ZnS0.977Te0.023 is lower than that of undoped ZnS0.977Te0.023，indicating that some of Al atoms form nonradiative deep traps. Deep level transient Fourier spectroscopy (DLTFS) spectra of the Al-doped ZnS1-xTex(x=0，0.017,0.04 and 0.046,respectively) epilayers reveal that Al doping leads to the formation of two electron traps at 0.21 and 0.39eV below the conduction band. DLTFS results suggest that in addition to the roles of Te as a component of the alloy as well as isoelectronic centers, Te is also involved in the formation of an electron trap, whose energy level relative to the conduction band decreases as Te concentration increases. Our results show that only a small fraction of Al atoms form nonradiative deep defects, indicating clearly that Al is indeed a very good donor impurity for ZnS1-xTexepilayers in the range of Te concentration studied in this work.
STUDY ON CONTROL OF CHAOTIC LORENZ SYSTEM
Authors: YU JIAN-ZU  , SU NAN  , T.L.VINCENT  ,   (1)北京航空航天大学飞行器设计及应用力学系，北京  100083; (2)美国亚利桑那大学航空航天及机械工程系，图桑  AZ85721
Published: November 2020

This paper investigates the methods for controlling chaos in the Lorenz system with nonlinear control theory. Applying a bang-bang control, we are able to transform the chaotic motion of the Lorenz system to stable motion which may contain apparent short-(or intermediate-) term chaotic motion. In particular, using the control method, we can eliminate the effect of initial conditions on the indeterminateness of the motion and drive the chaotic system to a specified equilibrium state.
A THEORETICAL STUDY ON ABSOLUTE TRIPLE DIFFERENTIAL CROSS SECTIONS FOR NEAR-THRESHOLD He+(e,2e) REACTIONS
Authors: JIA XIANG-FU  , SHI QI-CUN  , CHEN ZHANG-JIN  , CHEN JI  , XU KE-ZUN  ,   (1)山西师范大学物理系，临汾  041004; (2)中国科学技术大学近代物理系，合肥  230026
Published: November 2020

A correlated three-body continuum wave function proposed by Brauner et al. has recently been modified further to allow for the three-body effects by introducing Sommerfeld parameters (Berakdar and Briggs),it is used to calculate the triple differential cross sections for electron impact ionization of He+ in coplanar equal-energy sharing and symmetric geometry. The initial channel wave function involves a Coulomb wave function due to the long range Coulomb attraction between the incident electron and the screened ionic nucleus. Since the present work deals with symmetric collisions, the electron exchang effect between the two continuum electrons has been taken into account properly. It is shown that the initial channel Coulomb field play a major role in determining the triple differential cross sections at near-threshold incident energy and small impact parameter values.
THEORETICAL STUDY ON THE ELECTRONIC STRUCTURE OF STM TUNGSTEN TIP UNDER EXTERNAL ELECTRIC FIELDS
Authors: LI QUN-XIANG  , YANG JIN-LONG  , WANG KE-LIN  , HOU JIAN-GUO  , LI JIA-MING  ,   (1)清华大学单原子分子测控科学中心，北京  100084；中国科学院物理研究所，北京  100080; (2)中国科学技术大学基础物理中心，合肥  230026; (3)中国科学技术大学结构分析开放研究实验室，合肥  230026;中国科学技术大学基础物理中心，合肥  230026
Published: November 2020

The electronic structure of tungsten tip of (111) surface under external electric fields is studies by using discrete variational-local density functional method. The tunneling orbitals(TOs) and the charge distributions of the tip are calculated and analysed in detail under different conditions. The results show that the components of TOs are sensitive to the polarity, amplitude of the external electric field and the distances between tip and sample. It is found that although 5dz2 has some contribution to TOs, it is not dominant, which differs from the previous theoretical calculations. The dominating contributions are from 5dxz and 5dyz orbitals under positive bias voltages. However, under negative bias voltages, TOs are made of many orbitals including 6s orbital. Our results can explain the phenomenon in STM experiments that the resolution of STM images will be changed using the same tip when the polarity of the electric field is reversed, and can also predict that if one uses tungsten tip of (111) surface, the inverted STM images should be observed.
THE FEATURES OF GROUND STATES OF A FOUR-ELECTRON SYSTEM IN MAGNETIC FIELDS
Authors: XIE WEN-FANG  , CHEN CHUAN-YU  ,   广州师范学院物理系，广州  510400
Published: November 2020

By using the method of few-body physics, we study the relations between the energy of ground states and angular momentum of the four-electron systems in two-dimensional quantum dots in magnetic fields. The influences of the magnetic field and confined potential on ground states of the four-electron systems have been numerically calculated. The numerical results show that the quantum mechanical symmetry is the origin of magic numbers.
VARIATION OF THE CHARACTERISTICS OF V2O5 AMORPHOUS FILM WITH 308nm UV LASER
Authors: WEN XIAO-MING  , XIE CHONG-WEI  , CUI YONG-JIE  , WANG YUN-MEI  , LIN LI-ZHONG  ,   (1)云南大学物理系，昆明  650091; (2)云南省分析测试中心，昆明  650031
Published: November 2020

Its electric conductivity,spectral transmisivity and color change markly when V2O5 amorphous film is irradited by 308nm laser pulse if the fluence is over the threshold-The films before and after being irradited is surveyed with XRD,XPS and SEM methods, etc-It can be determined that the change of the film is due to irradiation by high fluence excimer laser pulse,the film temperature rises and melts quickly,and then the temperature lowers and the film resolidifies quickly- The quick melting and resolidifying procedure leads to oxygen deficiency in the film,so its stoichiometry changes-
INFLUENCE OF THE CYCLIC STRAIN WAVEFORM ON THE ULTRASONIC ATTENUATION DURING THE FATIGUE PROCESS OF ALUMINIUM
Authors: WANG JING  , FANG QIAN-FENG  , ZHU ZHEN-GANG  ,   中国科学院固体物理研究所内耗与固体缺陷开放实验室，合肥  230031
Published: November 2020

The ultrasonic attenuation Δα has been measured during the fatigue process of aluminium which is controlled by the total strain with a triangular or a sinusoidal waveform.The results indicate that the waveform has an influence on the Δα-ε curve at low strain amplitude,but has little influence at high strain amplitude.At low strain amplitude,the major reason causing the variation of Δα is the interaction between dislocations and point defects,and the waveform can change the re-distribution of point defects at the average stress field of the vibrating dislocation segments,as a result,the stable Δα-ε curves for the two kinds of waveform are different.At high strain amplitude,dislocation multiplication occurs,the interaction between dislocation segments is dominant,and the waveform cannot influence the dislocation multiplication and the interaction between dislocation segments.
TRANSFERENCE OF A KIND OF NONCLASSICAL PROPERTIES BETWEEN TWO INTERACTING MODES OF LIGHT
Authors: FU JIAN  , GAO XIAO-CHUN  , XU JING-BO  , ZOU XU-BO  ,   浙江大学浙江近代物理中心和浙江大学物理系，杭州  310027
Published: November 2020

The invariant-related unitary transformation method is used to study the transference of a kind of nonclassical properties between two interacting modes of light.With the aid of numerical computation,it is interesting to find that the mutual conversion of the Fock states (being nonclassical) and the coherent states is attained when the interaction is chosen appropriately.
ATOMIC CONFIGURATION AND ELECTRONIC STRUCTURE OF ERBIUM-DOPED SILICON
Authors: WAN JUN  , YE LING  , WANG XUN  ,   复旦大学应用表面物理国家重点实验室，上海  200433
Published: November 2020

The atomic configuration and electronic structure of erbium-doped silicon are studied theoretically by using local density formalism (LDF) and discrete variational method (DVM).The influence of codoping with oxygen is also investigated.The minimum-energy atomic configuration is that erbium occupies a tetrahedral interstitial site for an isolated erbium atom.In this configuration,Er 5d levels are located near the conduction band edge of Si in shallow resonance states. With the presence of oxygen,the binding energy of the structure decreases. In this case,the minimum-energy atomic configuration is that erbium occupies a hexagonal interstitial site with six nearest neighbors of oxygen atoms. An electronic state caused by the hybridization of Er 5d,O 2p and Si 2p electrons is located 0.3eV below the conduction band edge,which might be correlated with the deep level at Ec-0.15eV observed by the experimental measurement in Er and O codoped Si.
THE PITCH AND CHIRAL CENTER DISTRIBUTION IN SmC* LIQUID CRYSTALS
Authors: QIAN XIANG-ZHONG  ,   淮南工业学院基础部，淮南  232001
Published: November 2020

An expression concerning the variation of the pitch of SmC* liquid crystals is obtained by using the cell model in statistical mechanics with the introduction of the distribution factor ζχ of the chiral centers in the interaction potential between biaxial molecules containing multiple chiral centers.It shows the condition for inversion of helicity of the liquid crystals.With proper choice of the values of parameters involved we have calculated the variation of the pitch with temperature for liquid crystals TDOBAMCC,FLC,PACMB and H6/10.The calculated results agree well with the experimental data.
CONTROLLING CHAOTIC BEHAVIOR OF A LASER DIODE BY ALL EXTERNAL OPTICAL FEEDBACK
Authors: GU CHUN-MING  , SHEN KE  ,   (1)长春光学精密机械学院应用理学分院，长春  130022; (2)长春光学精密机械学院应用理学分院，长春  130022;北京理工大学工程光学系，北京  100081
Published: November 2020

A new method of controlling chaos of a laser diode by all external optical feedback was proposed according to the principle of Pyragas' method; the conditions in which the method can be used were given from theoritical analysis based on the coherence theory, and the results of the computer simulation proved that this method was efficient.
STUDY ON UPCONVERSION FLUORESCENCE OF Er3+-DOPED YTTRIUM VANADATE
Authors: WANG JIN-GUO  , ZHANG ZHI-GUO  , XU JI-REN  , FU PAN-MING  , YAN XIU-LI  , WU XING  , JIANG YAN-DAO  ,   (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光物理实验室与凝聚态物理中心，北京  100080
Published: November 2020

Upconversion fluorescence near 553 and 410nm was detected when the Er3+-doped yttrium vanadate (Er3+∶YVO4) crystal was excited with a 808nm-diode laser and a 658nm-dye laser. Analysis of excitation mechanism shows that excited state absorption dominantly contributes to the upconversion emissions. Measurement of lifetimes for different Er3+ concentration indicates that the lifetime of 553nm emission decreases with increasing Er3+ concentration, but no considerable changes of that of 410nm emission have been observed. With the consideration of the fact that the intensity of 553nm band declines with increasing Er3+ concentration, we argue that in the concentration range measured there is an appreciable concentration quenching in the 553nm emission, and a dominant population channel of its upper state (4S3/2) is the nonradiative relaxation from the upper state (2H9/2) of the 410nm band.
PHOTOABSORPTION OF COMPLEX THIN FILMS OF NOBLE METAL PARTICLES EMBEDDED IN MATRIX (Au-BaO,Cu-BaO)
Authors: LI LI-JUN  , WU JIN-LEI  ,   北京大学电子学系，北京  100871
Published: November 2020

In this paper the ultraviolet—visible photoabsorption spectrum of the complex thin films of noble metal (Au,Cu) particles embedded in BaO matrix is measured.The absorption spectra of the two kinds of films are quite different.There are surface plasmon mode and band transition absorption in the spectrum of the Au-BaO thin film.However,several peaks appear in the spectrum of the Cu-BaO thin film,because Cu exists as very small particles in the matrix.The absorption spectrum is dependent on the metal content.
THE TUNNELING CURRENT AND THE DICHROMATIC EFFECT IN RELATION TO THE MIXED PAIRING SYMMETRY STATE IN HIGH-TEMPERATURE SUPERCONDUCTORS
Authors: ZHOU SHI-PING  , XU KE-XI  , NIU JIN-HAI  ,   上海大学物理系，上海  201800
Published: November 2020

We present descriptions of the pairing symmetry in high-temperature superconductors.Analysis of the Josephson tunneling experiments based on the asymptotic s±id state has, to some extend,demonstrated the validity of the model,and the comparison of the theoretical calculations with the dichromatic observations in this kind of material has been in favor of the Γ1+Γ4 representation argument.The possible appearance of the fractional quantum flux vortex related to the specific mixed pairing symmetry has also been discussed.
GRAVITATIONAL EFFECT OF THE STRONG LASER PULSE
Authors: JI PEI-YONG  , ZHU SHI-TONG  , SHEN WEN-DA  ,   (1)上海大学物理系，上海  201800; (2)中国科学院上海光学精密机械研究所，上海  201800
Published: November 2020

The energy-level shifts of hydrogen spectrum in the curved space-time caused by the strong short laser pulse are studied. It is shown that under the present conditions of high-power laser pulse, the magnitude of the energy-level shifts of highly excited hydrogen atom will be observable.
STUDY OF VERTICALLY ALIGNING GROWTH OF SELF-ASSEMBLED InAs/GaAs QUANTUM DOTS
Authors: WANG ZHI-MING  , FENG SONG-LIN  , Lv ZHEN-DONG  , YANG XIAO-PING  , CHEN ZONG-GUI  , SONG CHUN-YING  , XU ZHONG-YING  , ZHENG HOU-ZHI  , WANG FENG-LIAN  , HAN PAI-DE  , DUAN XIAO-FENG  ,   (1)中国科学院半导体研究所超晶格微结构国家重点实验室，北京  100083; (2)中国科学院北京电子显微镜实验室，北京  100080
Published: November 2020

We have grown two-layer InAs structures spaced by 6.5nm GaAs. Self-assembled InAs quantum dots (QDs) occur in the first layer with 2.5ML InAs coverage due to S-K growth mode. The second layer changes from 2D to 3D growth when the thickness of InAs is 1.5ML, which is obviously smaller than the critical thickness (1.7ML) of single InAs layer structures. Transmission electron microscopy shows that two-layer QDs with different heights have been obtained according to the mechanism of a vertically correlated arrangement. But only one photoluminescence peak related with large QD ensemble has been observed as a result of strong electronic coupling in InAs QD pairs.
HIGHER-ORDER SINGULAR-SPECTRUM ANALYSIS OF NONLINEAR TIME SERIES
Authors: YUAN JIAN  , XIAO XIAN-CI  ,   电子科技大学电子工程系，成都  610054
Published: November 2020

Singular-spectrum analysis(SSA) is essentially a linear method based on the covariance matrix which reflects the structrue of the linear dependence. Numerical experience, however,led several authors to express some doubts about reliability of SSA in the attractor reconstruction.In this paper,based on higher-order cumulants which are blind to any kind of Gaussian process and can be used for analyzing the nonlinear correlation, a new notion of higher-order singular-spectrum analysis(H-SSA) is proposed.We illustrate our technique with numerical data from Hénon map,Logistic map and Lorenz model,and show that H-SSA is robust to reconstruction delay,embedding dimension and sampling time,and to the effect of the additive noise.
GROWTH OF CARBON NANOTUBES AND NANO-POLYHEDRA IN GRAPHITE SURFACE BY ION BEAM BOMBARDMENT
Authors: WANG ZHEN-XIA  , ZHU FU-YING  , WANG WEN-MIN  , XU XUN-JIANG  , RUAN MEI-LING  ,   (1)中国科学院上海硅酸盐研究所，高性能陶瓷和超微结构国家重点实验室，上海  200050; (2)中国科学院上海原子核研究所，上海  201800
Published: November 2020

We report a method of carbon nanotube and nano-polyhedron growth in graphite surface by 60keV Ar+ ion beam bombardment. High resolution transmission electron microscopy (HRTEM) reveals that the nanostructures range from ～20nm to ～0.4μm in size and the distance between carbon layers in multilayer walls is 0.34nm. Based on HRTEM images, we propose a growth model of “combined carbon polyhedron”.
INVARIANT-RELATED UNITARY TRANSFORMATION METHOD AND EXACT SOLUTIONS FOR THE QUANTUM DIRAC FIELD IN A TIME-DEPENDENT SPATIALLY HOMOGENEOUS ELECTRIC FIELD
Authors: FU JIAN  , GAO XIAO-CHUN  , XU JING-BO  , ZOU XU-BO  ,   浙江大学浙江近代物理中心和浙江大学物理系，杭州 310027
Published: November 2020

On the basis of the generalized invariant formulation, the invariant-related unitary transformation method is used to study the evolution of the quantum Dirac field in a time-dependent spatially homogeneous electric field. We solve the functional Schr?dinger equation for the Dirac field and obtain the exact solutions and corresponding total phase. The total phase includes both the dynamical phase and geometric phase (Aharonov-Anandan phase).
MACROSCOPIC THEORY OF NONLINEAR OPTICAL ACTIVITY IN A NONCONDUCTIVE ISOTROPIC CHIRAL MEDIUM
Authors: LI JUN-QING  , LI CHUN-FEI  , XIN LI  , LIU SHU-TIAN  , T.M.IL’INOVA  , N.I.KOROTEEV  ,   (1)国立莫斯科大学物理系及国际激光中心,莫斯科　119899; (2)哈尔滨工业大学物理系，哈尔滨　150001
Published: November 2020

A nonconductive isotropic chiral medium is described by using classical electromagnetic theroy. The phenomenon of nonlinear optical activity of a linearly polarized aignal light under the action of a circularly polarized pump light is investigated. The expressions of nonlinear optical rotational angle are given. The calculated results using the expressions are in accordance to the experimental results.