bluuebunny/crossref_metadata_2025_split huggingface dataset:
Enhanced nonlinear optical properties and optical limiting performance of graphene modified polyaniline composite under pulsed laser regime
Authors: Mathew Roshan Joseph , Chandran Arun R , K S Syam Kishor , Kumar K V Arun , Saji K J , Sajeev U S 
Published: June 2024

Abstract
Polyaniline (PANI) and its graphene-doped composite (PANI-GNP) were subjected to open-aperture (OA) z-scan studies to investigate their nonlinear optical (NLO) properties and optical limiting (OL) behavior. The z-scan experiments were carried out using a nanosecond pulsed Nd:YAG laser at a wavelength of 532 nm. The z-scan studies revealed that PANI and PANI-GNP composites exhibited a reverse saturable absorption (RSA), and graphene doping modified the NLO behaviour and improved the OL property. The nonlinear absorption coefficient (β), OL threshold, and imaginary part of nonlinear susceptibility (

χ

i

(
3
)

) of PANI and PANI-GNP were calculated for three different laser input pulse energies and found to be in the order of 10−9 cm W−1, 106 W cm−2, and 10−10 esu, respectively. These results qualify the PANI-GNP composite as having potential applications in OL and optoelectronic devices. The successful incorporation of graphene into PANI in PANI-GNP composite was confirmed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). Linear optical properties were analysed using UV–visible absorption spectroscopy. To the best of our knowledge, the present work is the first attempt to explore the intensity-dependent NLO properties, OL behaviour and the calculation of their related NLO parameters of PANI-GNP composites.
Effects of different Ti concentrations doping on Li2MnO3 cathode material for lithium-ion batteries via density functional theory
Authors: Thajitr W , Busayaporn W , Sukkabot W 
Published: June 2024

Abstract
Li2MnO3 is extensively studied for a cathode material in lithium-ion batteries because of its high voltage and specific capacity. Nevertheless, it has the disadvantages due to low conductivity and Li-ion diffusion. To modify its performance, we determine the structure stability and electronic properties of Li2MnO3 cathodes doped with different Ti-ion concentrations using the spin-polarized density functional theory including the Hubbard term (DFT + U). For the calculations, cell parameters, formation energies, band gaps, total density of states, partial density of states and stability voltages are determined. The results highlight that the expansion of the cell volumes by Ti-ion impurities has a positive effect on the diffusion of Li ions in these cathodes. Because of the minor voltage changes, Li2MnO3 cathode doped with a Ti-ion concentration of 0.250 exhibits the highest voltage stability. Overall, these results are effective for the lithium-ion battery application based on Ti-doped Li2MnO3 cathodes.
On a one-dimensional time-fractionally damped wave equation with a singular potential
Authors: Jleli Mohamed , Samet Bessem 
Published: June 2024

Abstract
A nonlinear time-fractionally damped wave equation with an inverse-square potential posed on the interval (0, 1) is investigated. The time-fractionally derivative is considered in the Caputo sense. A weight function of the form x
−σ
(

σ
∈
R

) is allowed in front of the nonlinearity ∣u(t, x)∣
p
(p > 1). The problem is studied under certain initial conditions and a homogeneous boundary condition. Namely, we obtain sufficient conditions under which the considered problem admits no weak solution. The cases u(0, · ) ≡ 0 and u(0, · ) ≢ 0 are studied separately.
Probing the twist angle of confined prominence eruption using SDO/AIA data
Authors: Khaled Safinaz A , Shaltout Abdelrazek M K , Abdelkawy Ali G A , Hassanin A , Semeida Mohamed A , Ghitas Ahmed 
Published: June 2024

Abstract
In this context, we utilized a simplified representation of the curved cylinder flux tube to approximate the helical structure of the prominence. By considering the bright helical features as indicators of the magnetic field, we measured the average twist angle of the prominence legs. To gather the necessary data, we obtained image data with a wavelength of 171 Å from the Solar Dynamic Observatory (SDO)/Advanced Imaging Assembly (AIA) archive. We employed some IDL routines within the SolarSoft (SSW) package to determine the flux rope’s total twist angle for a confined prominence eruption. Specifically, we focus on a confined prominence eruption that occurred at the south-east limb of the Sun for an active region (AR) NOAA (AR 11 117) observed on October 21, 2010. The eruption commenced on 2010-10-21 at 21:56:18 UT and lasted until 2010-10-22 at 01:24:58 UT. During this event, a B2.6 flare class that occurred on 2010-10-21 at 23:17 UT, located at heliographic position of N20E84. Our results indicate that the distance between the two footpoints is up to 18 670 km. Initially, when the event began the height (h) was found to be 21 162.1 km, but the height was increased to reach 80 362.4 km at the end of eruption. The flux rope’s average twist angle (ϕ, in radian) at the beginning of eruption was ϕ = 13.4π. As the prominence ascended to higher levels, the twist angle was decreased gradually due to the magnetic field relaxation reached to ϕ = 3.6π. We determined that the flux ropes average twist angle (ϕ) that exceed the threshold for the helical kink instability. Therefore, we conclude that the eruption was caused by helical kink instability, as a result it is in consistent with other investigations.
Interruption characteristic of 3%C5F10O/97%CO2 gas mixture in a 40.5 kV circuit breaker
Authors: Cui Zhaoxuan , Lin Xin , Xia Yalong , Xu Jianyuan 
Published: June 2024

Abstract
The C5F10O/CO2 gas mixture is one of the most promising SF6 alternative gases at the present stage, which was initially applied in high-voltage electrical equipment. This paper mainly studies the interruption performance of 3%C5F10O/97%CO2 gas mixture (k = 3%) with a charging pressure of 0.6 MPa in high-voltage circuit breakers. First, the thermodynamic parameters, transport coefficient, and net radiation coefficient were calculated for k = 3%. On this basis, a 40.5 kV circuit breaker was used as a prototype to establish the magnetohydrody-namic model for breaking 20 kA short-circuit current, and the arc temperature and pressure distribution in the arc extinguishing chamber of the circuit breaker were calculated. The LC oscillation circuit was used to build an arc-extinguishing characteristic test platform to verify the accuracy of the numerical calculation. Finally, based on the Mayr arc model and the critical electric field strength, the post-arc thermal breakdown and electrical breakdown characteristics of SF6, CO2, and k = 3% were quantitatively analyzed. The results show that under 0.6 MPa, the thermal breakdown performance of k = 3% is about 89.7% of SF6, which is nearly twice higher than that of CO2 and has better thermal breaking ability. The electrical breakdown performance of k = 3% is about 20.4% of SF6, and the probability of electrical breakdown in the front end of the fixed contact is high. This problem should be paid attention to in the design of high-voltage circuit breakers. This study can provide a reference for the development and optimization of environmentally friendly high-voltage circuit breakers.
Effect of non-square potential profile on three subband electron mobility in AlGaAs quantum well structures
Authors: Sahu Ajit Kumar , Sahoo Narayan , Swain Raghunandan , Sahu Trinath 
Published: June 2024

Abstract
This work analyses the effect of the non-square structure potentials, such as V-shaped (V), parabolic (P), cubic (C), semi-V (SV), semi-parabolic (SP), and semi-cubic (SC) on the low temperature electron mobility (μ) as a function of doping concentrations (N

d
= 0.1 to 3.0 × 1018 cm−3) in modulation δ-doped quantum well (QW) structures. We calculate μ by adopting screened ionized impurity (ii-) and alloy disorder (al-) scatterings. We consider higher subband occupancy up to three and show that the intersubband effects influence the screened scattering potentials differently, such that μ

ii
increases while μ

al
decreases, leading to nonlinear enhancement of μ. Further, there are sudden drops in μ, near the transition of occupation of subbands due to the intersubband effects, and the magnitude of the drop is reduced at the third subband occupancy. The number of occupied subbands (nos), for the considered range of N

d
, differs with NSQW structures, e.g., nos = 3 in the case of VQW, CQW, and PQW, nos = 2 in SCQW and SPQW, and nos = 1, in SVQW structures. Interestingly, in VQW, the occupation of the second subband starts at a higher N

d
, compared to CQW and PQW, while, the third subband occupancy shows an opposite trend. Furthermore, the dissimilarity in electron charge distributions in the NSQW structures influences the ii-scattering potential differently, causing μ

ii
(VQW) > μ

ii
(PQW) > μ

ii
(CQW), while for al-scattering the order of μ

al
reverses.
Quantum secure multiparty computing XOR protocol based on single photons and its application in quantum secure communications for intelligence agents
Authors: Li Huijie , Shi Run-Hua , Jia Qianqian 
Published: June 2024

Abstract
In this paper, we consider an interesting and important privacy-preserving issue, i.e., how to implement anonymous and secure communications for several intelligence agents, hiding in n participants. To solve this issue, we first propose a quantum Secure Multiparty Computing XOR (SMC_XOR) protocol based on single photons, which can guarantee the unconditional security of the protocol. By implementing rotation encryption, the practicality of quantum SMC_XOR protocol can be significantly improved without other complex quantum techniques. Security analysis shows that the proposed protocol can resist various types of attacks. Furthermore, a special network model is designed to solve this issue, using hash function to verify the identity of the communication parties and key recycling to reduce resource consumption. Finally, the proposed quantum SMC_XOR protocol is simulated in IBM Qiskit, and the simulation results show that the protocol is correct and feasible.
Dielectric terahertz metasurface governed by symmetry-protected BIC for ultrasensitive sensing
Authors: Yan Hui , Fan Wen-Hui , Jiang Xiao-Qiang , Chen Xu , Qin Chong , Wu Qi 
Published: June 2024

Abstract
The non-radiative bound states in the continuum (BIC) have attracted much attention in achieving theoretically infinite quality (Q) factor. In this paper, a dielectric terahertz metasurface with C
4v symmetry is proposed, and a toroidal dipole resonance is easily obtained under incident plane wave. Moreover, by slightly tuning the asymmetry parameter δ to break the in-plane symmetry of the structure (side length perturbation), a magnetic dipole BIC mode radiates as quasi-BIC (QBIC) with extremely narrow linewidth and ultrahigh Q of 1.2 × 104 at δ = 0.4 μm. It shows significant performance in THz sensing with the sensitivity around 446 GHz/RIU and figure of merit (FoM) up to 2267. The designed metasurface in the case of symmetry-breaking by position perturbation also achieves ultrasensitive sensing. Additionally, the effects of geometric parameters on the resonance modes have been comprehensively investigated. Our work provides a route to design symmetry-protected BIC metasurface with simple structure, and the Q factor as well as resonant frequency can be controlled using a single geometric parameter, which may facilitate designing high-performance metasurface in sensing applications.
Investigation of pressure-driven superconductivity in TlInTe2: an ab initio study
Authors: Renskers Christopher , Margine Elena R 
Published: June 2024

Abstract
The Zintl compound TlInTe2 is an intriguing material because of its outstanding thermoelectric properties at ambient pressure. Interestingly, it has recently been found that TlInTe2 exhibits a V-shape dependence of the superconducting critical temperature (T
c) under increasing pressure, which has been linked to the reversed behavior of the Raman active Ag phonon mode and anharmonic effects. In this study, we have performed first-principles calculations of the electron-phonon interactions and the superconducting properties of TlInTe2 in order to understand this unusual pressure-induced response. In contrast to experiment, we find a dome-shaped pressure-induced dependence of T

c
with a maximum value of 0.23 K at 18 GPa, significantly lower than the experimental results. Electron doping has the potential to adjust the T
c to fall within the experimental range, but it necessitates considerably high levels of doping. Furthermore, our analysis of the phonon spectra and phonon lifetimes, including anharmonic effects, show that anharmonicity is unlikely to influence the superconducting properties of TlInTe2. It remains an open question whether there is indeed an unusual V-shape T
c dependence with pressure or whether the phonon-mediated theory of superconductivity used here breaks down in this system.
Light management in hole transport layer-free perovskite solar cell by SPP and LSPR
Authors: Batoo Khalid Mujasam , Ibrahim Ahmed Ahmed , Naeem Youssef Ali , Abdulameer Maha Khalid , Zazoum Bouchaib , Khuder Shahad Abdulhadi , Ward Zahraa Hassan , F Ramadan Montather , Al-Tameemi Ahmed Read , Hasan Kadhum Eftikhaar , Alzubaidi Laith H 
Published: June 2024

Abstract
In recent years, light management based on localized surface plasmon resonance (LSPR) effects in perovskite solar cells (PSCs) has received significant attention. However, the use of surface plasmon polariton (SPP) excitations in PSCs has been less studied. Meanwhile, hole transport layer-free perovskite solar cells (HTL-free PSCs) have garnered interest due to their lower cost. In this study, we improve light absorption in HTL-free PSCs by simultaneously utilizing LSPR and SPP effects. Au nanotriangles are employed on the surface of the back electrode to excite SPPs. The thickness of the perovskite layer is varied from 100 nm to 400 nm. The optimal periodicity and dimensions of the triangular nanoparticles are determined for each perovskite layer thickness. In the optimal structures with perovskite layer thicknesses of 100 nm, 200 nm, 300 nm, and 400 nm, absorption enhancements of 25%, 12.4%, 13%, and 4.3% are achieved, respectively. The interaction of light with SPP and LSP modes leads to improved solar cell performance. Furthermore, the short circuit current density (JSC) in structures with layer thicknesses of 100 nm and 200 nm increased from 16.7 mA cm−2 to 20.71 mA cm−2 and from 19.8 mA cm−2 to 21.86 mA cm−2, respectively. Other photovoltaic characteristics of the solar cell were obtained through optical-electrical numerical analysis. For the improved solar cell with a perovskite thickness of 100 nm, the values of open circuit voltage, efficiency, and fill factor were 0.847 V, 0.81, and 14.24%, respectively, representing increases of 1.1%, 2.4%, and 28.7% compared to the bare device. Additionally, in the solar cell with a thickness of 200 nm, an efficiency of 17.03% was achieved, showing a 12.5% improvement compared to the bare structure. Our research results facilitate the design of high-performance, ultra-thin, semi-transparent solar cells.
The shot noise in quasi-one-dimensional single spin filter magnetic heterojunctions
Authors: Lü Hou-Xiang , Fang Tian-Hai , Xie Zheng-Wei , Tang Ming-Jun 
Published: June 2024

Abstract
Based on the free electronic model and Büttike’s theory on shot noise, we investigated the shot noise of spin electrons in ferromagnetic/non-ferromagnetic insulator/spin filter layer/normal metal (FM/I/SF/NM) quasi-one-dimensional single spin filter tunneling junctions. The calculation results show that the barrier heights and thicknesses of the insulator and spin filter layers strongly affect the values and phases of the Fano factors of spin electrons. Compared with the traditional sandwich structures of ferromagnetic/spin filter layer/normal metal (FM/SF/NM) and ferromagnetic/non-ferromagnetic insulator/normal metal (FM/I/NM), when the thicknesses of the insulator and spin filter layers are very small, in single spin filter magnetic heterojunctions (FM/I/SF/NM), the insulator layer can suppress the Fano factors, while the spin filter layer is easier to separate the Fano factors of electrons whose spin directions are different. Further analysis shows that whether the Rashba coupling in the spin filter layer has an obvious influence on the Fano factors of spin electrons depends on the thickness of the spin filter layer. On the other hand, the Fano factors are strongly dependent on the sizes and directions of the molecular fields of the ferromagnet and spin filter layers. In addition, the electrons are incident with low energy or high energy, and the barrier heights and thicknesses of the spin filter layer and the thicknesses of the insulation layer have a significant effect on the spin-direction-dependent Fano factors of electrons.
Exploring the NANOGrav signal and planet-mass primordial black holes through Higgs inflation
Authors: Yi Zhu , You Zhi-Qiang , Wu You , Chen Zu-Cheng , Liu Lang 
Published: June 2024

Abstract
The data recently released by the North American Nanohertz Observatory for Gravitational
Waves (NANOGrav) provides compelling evidence supporting the existence of a stochastic signal that
aligns with a gravitational-wave background. We show that the scalar-induced gravitational waves
from the Higgs inflation model with the parametric amplification mechanism can explain this
signal. Such a gravitational-wave background naturally predicts the substantial existence of
planet-mass primordial black holes, which can be planet 9 in our solar system and the lensing
objects for the ultrashort-timescale microlensing events observed by the Optical Gravitational
Lensing Experiment. Therefore, the NANOGrav signal, the potential Planet 9 in our solar system,
and the Optical Gravitational Lensing Experiment can be explained within the framework of Higgs
inflation.
Density dependent displaced vertex signatures as a novel probe of light dark sector scalars at the LHC
Authors: Argyropoulos Spyros , Burrage Clare , Englert Christoph 
Published: June 2024

Abstract
Dynamical theories of dark energy predict new degrees of freedom with particular environmental sensitivity to avoid constraints on fifth forces. We show that the similar, yet complementary multi-purpose detector setup of the ATLAS
and CMS experiments provides a unique opportunity to place sensitivity on such scenarios in a narrow, yet relevant parameter range. Furthermore, our investigation gives rise to a novel phenomenological signature that the LHC experiments
can pursue to exploit their complementary detector design from a BSM perspective.
Suggestions of decreasing dark energy from supernova and BAO data
Authors: Raamsdonk Mark Van , Waddell Chris 
Published: June 2024

Abstract
The potential energy from a time-dependent scalar field provides a possible explanation for the observed cosmic acceleration. In this paper, we investigate how data from supernova and bary acoustic oscillation surveys constrain the possible evolution of a single scalar field over the period of time (roughly half the age of the universe) for which these data are available. Taking a linear approximation to the scalar potential V(ϕ) = V
0 + V
1
ϕ around the present value, a likelihood analysis appears to significantly prefer models with a decreasing potential energy at present, with approximately 99.99 % of the exp(-χ
2/2) distribution having V
1 > 0 in a convention where ϕ̇ ≤ 0 at present. The models favoured by the distribution typically have an order one decrease 〈|Range[V(ϕ(t))]/V(t
0)|〉 ≈ 0.36 in the scalar potential energy over the time frame corresponding to z < 2. According to the likelihood analysis, the ΛCDM model with no variation in dark energy appears to be significantly disfavoured in the context of the linear potential model, but this should be interpreted cautiously since model selection criteria that make use of Δχ
2 while ignoring parameter space volumes still favour ΛCDM. Working with a second order approximation to the potential, the supernova data can be fit well for a wide range of possible potentials, including models where the universe has already stopped accelerating.
Influence of electron–phonon interaction on linear and nonlinear magneto-optical absorption properties in monolayer transition metal dichalcogenides
Authors: Bich Tran N , Dinh Le , Phuc Huynh V 
Published: June 2024

Abstract
In this study, we investigate the linear and non-linear magneto-optical properties of TMDC monolayer semiconductors MX2 (M = Mo/W, X = S/Se) in a perpendicular magnetic field by evaluating the magneto-optical absorption coefficients (MOACs) and the refractive index changes (RICs) subject to the influence of electron–phonon interaction (EPI). Our results are achieved by considering the influence of electron couplings with acoustic (AC) and optical (OP) phonons via the absorption (AB) and emission (EM) mechanisms. When compared to the neglected EPI case, the intensity of the linear MOAC and RIC increases about 2.6–4 times and 5.3–10.5 times, respectively. The absorption peaks exhibit the blue-shifts, with the largest blue-shift observed for the OP-EM phonon scatterings, followed by the AC phonons and the smallest for the OP-AB phonon scatterings. Meanwhile, the greatest contribution to MOAC and RIC comes from the OP-AB phonons, which is followed by that of the AC phonons and the OP-EM phonons, respectively. The MoX2 group is more significantly affected by the scattering mechanism compared to the WX2 one. Although the OP-EM phonons contribution for the MoX2 group is much smaller than that of the other two interaction mechanisms, it nevertheless produces a very noticeable blue-shift. Meanwhile, for the WX2 group, all three mechanisms erect comparable results. The biggest (smallest) value of the linear MOAC and RIC are both founded in MoSe2 (MoS2). Notably, the absolute values of the non-linear MOAC and RIC terms increase by tens to hundreds of times, leading to the total MOAC terms being negative, contrary to when EPI is not taken into account, while the characteristics of the non-linear RIC curves also undergo considerable changes. Among the four TMDC materials, MoX2 is more significantly affected by the EPI effect than WX2.
Cauchy matrix approach for H1
a
equation in the torqued Adler–Bobenko–Suris lattice list
Authors: Wang Jing , Zhao Song-lin , Shen Shoufeng 
Published: June 2024

Abstract
As a torqued version of the lattice potential Korteweg–de Vries equation, the H1
a
is an integrable nonsymmetric lattice equation with only one spacing parameter. In this paper, we present the Cauchy matrix scheme for this equation. Soliton solutions, Jordan-block solutions and soliton-Jordan-block mixed solutions are constructed by solving the determining equation set. All the obtained solutions have jumping property between constant values for fixed n and demonstrate periodic structure.