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Applying deep learning technique to chiral magnetic wave search

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Chinese physics C 2024年第8期48卷 170-176页

作者： Yuan-Sheng Zhao Xu-Guang Huang physics Department and Center for Particle physics and Field Theory Fudan UniversityShanghai 200433China key laboratory of Nuclear physics and ion-beam Application(moe) Fudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear physics National Natural Science Foundation of China and Fudan UniversityShanghai 200438China

The chiral magnetic wave(CMW)is a collective mode in quark-gluon plasma originated from the chiral magnetic effect(CME)and chiral separation *** detection in heavy-ion collisions is challenging owing to significant background ***[*** et al.,***.C 106,L051901(2022)],we constructed a neural network that accurately identifies the CME-related signal from the final-state pion *** this study,we have generalized this neural network to the case of CMW *** show that,after an updated training,the neural network effectively recognizes the CMW-related ***,we have assessed the performance of the neural network in comparison with other known methods for CMW search.

关键词： deep learning chiral magnetic wave relativistic heavy-ion collisions

The Weak Magnetic Photon Emission from Quark-gluon Plasma

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原子核物理评论 2024年第1期41卷 558-563页

作者： SUN Jing’an YAN Li Institute of Modern physics Fudan UniversityShanghai 200433China key laboratory of Nuclear physics and ion-beam Application(moe) Fudan UniversityShanghai 200433China

There must be electromagnetic fields created during high-energy heavy-ion *** the electromagnetic field may become weak with the evolution of the quark-gluon plasma(QGP),compared to the energy scales of the strong interaction,they are potentially important to some electromagnetic *** this work,we propose the coupled effect of the weak magnetic field and the longitudinal dynamics of the background medium for the first *** demonstrate that the induced photon spectrum can be highly azimuthally anisotropic when the quarkgluon plasma is in the presence of a weak external magnetic *** the other hand,the weak magnetic photon emission from quark-gluon plasma only leads to a small correction to the photon production *** hydrodynamic evolution with a tilted fireball configuration,the experimentally measured direct photon elliptic flow is well ***,the used time-averaged magnetic field in the hydrodynamic stage is found no larger than a few percent of the pion mass square.

关键词： heavy-ion collision the direct photon weak magnetic field elliptic flow

New results on the dynamics of critical collapse

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Chinese physics C 2024年第6期48卷 204-210页

作者：郭俊起胡宇王盼盼邵成刚 School of physics and Technology University of JinanJinan 250022China moe key laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum PhysicsPGMFand School of PhysicsHuazhong University of Science and TechnologyWuhan 430074China

We study the dynamics of the critical collapse of a spherically symmetric scalar *** analytic expressions for the metric functions and matter field in the large-radius region are *** the central region,owing to the bo... 详细信息

关键词： critical collapse spacetime singularities numerical relativity

Observation of accurately designed bound states in the continuum in momentum space

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Photonics Research 2024年第4期12卷 638-647页

作者： JIAJU WU JINGGUANG CHEN XIN QI ZHIWEI GUO JIAJUN WANG FENG WU YONG SUN YUNHUI LI HAITAO JIANG LEI SHI JIAN ZI HONG CHEN moe key laboratory of Advanced Micro-Structured Materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China State key laboratory of Surface physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200433China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Bound states in the continuum(BICs)in artificial photonic structures have received considerable attention since they offer unique methods for the extreme field localization and enhancement of light-matter ***,the symmetry-protected BICs are located at high symmetric points,while the positions of accidental BICs achieved by tuning the parameters will appear at some points in momentum *** to now,to accurately design the position of the accidental BIC in momentum space is still a ***,we theoretically and experimentally demonstrate an accurately designed accidental BIC in a two-coupled-oscillator system consisting of bilayer gratings,where the optical response of each grating can be described by a single resonator *** changing the interlayer distance between the gratings to tune the propagation phase shift related to wave vectors,the position of the accidental BIC can be arbitrarily controlled in momentum ***,we present a general method and rigorous numerical analyses for extracting the polarization vector fields to observe the topological properties of BICs from the polarization-resolved transmission ***,an application of the highly efficient second harmonic generation assisted by quasi-BIC is *** work provides a straightforward strategy for manipulating BICs and studying their topological properties in momentum space.

关键词： polarization tuning resonator

Abnormal transition of the electron energy distribution with excitation of the second harmonic in low-pressure radio-frequency capacitively coupled plasmas

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Plasma Science and Technology 2024年第8期26卷 58-63页

作者：余乐怡陆文琪张丽娜 key laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024People’s Republic of China

The self-excited second harmonic in radio-frequency capacitively coupled plasma was significantly enhanced by adjusting the external variable *** a lower pressure of 3 Pa,the excitation of the second harmonic caused an abnormal transition of the electron energy probability function,resulting in abrupt changes in the electron density and *** changes in the electron energy probability function as well as the electron density and temperature were not observed at the higher pressure of 16 Pa under similar harmonic *** phenomena are related to the influence of the second harmonic on stochastic heating,which is determined by both amplitude and the relative phase of the *** results suggest that the self-excited high-order harmonics must be considered in practical applications of lowpressure radio-frequency capacitively coupled plasmas.

关键词： radio-frequency capacitively coupled plasma harmonics the electron energy probability function

Probing valence quark width of the proton in deeply virtual Compton scattering at high energies

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Chinese physics C 2024年第5期48卷 235-243页

作者：向文昌曹德文周代翠 physics Division Guangzhou Maritime UniversityGuangzhou 510725China key laboratory of Quark and Lepton physics(moe) and Institute of Particle PhysicsCentral China Normal UniversityWuhan 430079China

We use the refined hot spot model to study the valence quark shape of the proton with the deeply virtual Compton scattering at high energies in the color glass condensate *** investigate the individual valence quark shape,a novel treatment of the valence quark width is *** calculate the cross-sections for coherent and incoherent deeply virtual Compton scattering using,for the first time,different widths(Bu and Bd)for the profile density distributions of the up and down quarks instead of using the same width as in the *** find that the cross-sections calculated with Bu≥Bd at each collision energy are consistent with each other,which is in agreement with theoretical expectations,whereas those computed with Buion energy increases,the aforementioned discrepancies are not only significantly broadened,but also shift to a relatively smaller momentum transfer range at the future Electron-ion Collider(EIC)and Large Hadron Electron Collider(LHeC)energies,which indicates that the EIC and LHeC can provide an unprecedented chance to access the shape of the valence quark of the proton.

关键词： gluon saturation physics color glass condensate proton shape fluctuations

Numerical studies for plasmas of a linear plasma device HIT-PSI with geometry modified SOLPS-ITER

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Chinese physics B 2024年第3期33卷 503-508页

作者：王敏聂秋月黄韬王晓钢张彦杰 School of physics Harbin Institute of TechnologyHarbin 150001China School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001China moe (Ministry of Education) key laboratory of Materials Modification by Laser Ionand Electron BeamsSchool of PhysicsDalian Institute of TechnologyDalian 116024China

The HIT-PSI is a linear plasma device built for physically simulating the high heat flux environment of future reactor divertors to test/develop advanced target plate *** this study,the geometry-modified SOLPS-ITER program is employed to examine the effects of the magnetic field strength and neutral pressure in the device on the heat flux experienced by the target plate of the HIT-PSI *** findings of the numerical simulation indicate a positive correlation between the magnetic field strength and the heat flux ***,there is a negative correlation observed between the heat flux density and the neutral *** the magnetic field strength at the axis exceeds 1 tesla and the neutral pressure falls below 10 Pa,the HIT-PSI has the capability to attain a heat flux of 10 MW·m-2 at the target *** simulation results offer a valuable point of reference for subsequent experiments at HIT-PSI.

关键词： HIT-PSI heat flux linear plasma SOLPS-ITER device

Manipulation of low-refractive-index particles using customized dark traps

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Photonics Research 2024年第6期12卷 1334-1343页

作者： MINRU HE YANSHENG LIANG XUE YUN SHAOWEI WANG TIANYU ZHAO LINQUAN GUO XINYU ZHANG SHIQI KUANG JINXIAO CHEN MING LEI moe key laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi’an Jiaotong UniversityXi’an 710049China State key laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China

Low-refractive-index particles play significant roles in physics,drug delivery,biomedical science,and other ***,they have not attained sufficient utilization in active manipulation due to the repulsive effect of *** this work,the establishment of customized dark traps is demonstrated to fulfill the demands of versatile manipulation of low-refractive-index *** customized dark traps are generated by assembling generalized perfect optical vortices based on the free lens modulation method,by which the beams’shape,intensity,and position can be elaborately designed with size independent of topological *** the customized dark traps with high quality and high efficiency,rotation along arbitrary trajectories with controllable speed,parallel manipulation,and sorting of low-refractive-index particles by size can be *** unprecedented flexibility and quality,the customized dark traps provide tremendous potential in optical trapping,lithography,and biomedicine.

关键词： refractive rotation versatile

Regulating the conductance of tungsten diselenide by oxygen plasma and improving its electrical stability by encapsulation

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Nano Research 2024年第4期17卷 3253-3260页

作者： Zhaofang Cheng Shaodan He Shimin Zhang Shijun Duan Min Wang Ziyu Liu Rong Zhang Wenya Qiang Xudong Zhang Minggang Xia moe key laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi’an Jiaotong UniversityXi’an 710049China Department of Applied physics School of PhysicsXi’an Jiaotong UniversityXi’an 710049China Shaanxi Province key laboratory of Quantum Information and Optoelectronic Quantum Devices School of PhysicsXi’an Jiaotong UniversityXi’an 710049China

Two-dimensional(2D)tungsten selenide(WSe_(2))is promising candidate material for future electronic applications,owing to its potential for ultimate device *** improving the electronic performance of WSe_(2)-based field-effect transistors(FETs),the modification of surface properties is *** this study,the seamless structural phase transition in WSe_(2) lattice is achieved by soft oxygen plasma,regulating the electrical conductance of WSe_(2)-based *** found that during the soft oxygen plasma treatment with optimal processing time,the generated oxygen ions can substitute some selenium atoms and thus locally modify the bond length,inducing 2H→1T phase transition in WSe_(2) with seamless *** mosaic structures have been proven to tailor the electronic structure and increase the hole carrier concentration inside WSe_(2),significantly increasing the channel conductance of WSe_(2) *** the further increase of the oxygen plasma treatment time,the creation of more selenium vacancy defects leads to the electronic doping,resulting in the reduction of *** from the hexagonal boron nitride(h-BN)encapsulation to interrupt the partial structural relaxation from 1T to 2H phase,our WSe_(2) FET exhibits high electronic stability with conductance of 6.8×10^(-4) S,which is about four orders of magnitude higher than 2H WSe_(2)(5.8×10^(-8) S).This study could further broaden the WSe_(2) FETs in applications for functionalization and integration in electronics.

关键词： tungsten selenide(WSe2) structural phase transition oxygen plasma conductance hexagonal boron nitride(h-BN)encapsulation