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Solitonic attractors in the coupled nonlinear Schrödinger equations with weak dissipations

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Communications in Theoretical Physics 2023年第6期75卷 22-26页

作者： Kai-Yuan Qi Xian-kun Yao Li-Chen Zhao Zhan-Ying Yang School of Physics Northwest UniversityXi’an 710127China nsfc-sptp peng huanwu center for fundamental theory Xi’an 710127China Shaanxi Key Laboratory for Theoretical Physics Frontiers Xi’an 710127China

We use the Lagrangian perturbation method to investigate the properties of soliton solutions in the coupled nonlinear Schrödinger equations subject to weak *** study reveals that the two-component soliton solutions act as fixed-point attractors,where the numerical evolution of the system always converges to a soliton solution,regardless of the initial ***,the fixed-point attractor appears as a soliton solution with a constant sum of the two-component intensities and a fixed soliton velocity,but each component soliton does not exhibit the attractor feature if the dissipation terms are *** suggests that one soliton attractor in the coupled systems can correspond to a group of soliton solutions,which is different from scalar *** findings could inspire further discussions on dissipative-soliton dynamics in coupled systems.

关键词： coupled nonlinear systems weak dissipation solitonic attractor

Evolution of N=20,28,50 shell closures in the 20≤Z≤30 region in deformed relativistic Hartree-Bogoliubov theory in continuum

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Chinese Physics C 2024年第1期48卷 144-153页

作者：郑茹尤孙向向申国防耿立升 School of Physics Beihang UniversityBeijing102206China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Institut für Kernphysik Institute for Advanced Simulation and Jülich Center for Hadron PhysicsForschungszentrum JülichD-52425 JülichGermany CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China peng huanwu Collaborative center for Research and Education Beihang UniversityBeijing 100191China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 102206China Southern center for Nuclear-Science theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

Magicity,or shell closure,plays an important role in our understanding of complex nuclear *** this work,we employ one of the state-of-the-art density functional theories,the deformed relativistic Hartree-Bogoliubov theory in continuum(DRHBc)with the density functional PC-PK1,to investigate the evolution of the N=20,28,50 shell closures in the 20≤Z≤30 *** show how these three conventional shell closures evolve from the proton drip line to the neutron drip line by studying the charge radii,two-neutron separation energies,two-neutron gaps,quadrupole deformations,and single-particle *** particular,we find that in the 21≤Z≤27 region,the N=50 shell closure disappears or becomes quenched,mainly due to the deformation ***,both experimental data and theoretical predictions indicate that the N=28 shell closure disappears in the Mn isotopic chain,mainly due to the deformation *** DRHBc theory predicts the existence of the N=20 shell closure in the Ca,Sc,and Ti isotopic chains,but the existing data for the Ti isotopes suggest the contrary,and therefore further research is needed.

关键词： shell evolution covariant density functional theories magic numbers

Rate of the phase transition for a charged anti-de Sitter black hole

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Science China(Physics,Mechanics & Astronomy) 2023年第4期66卷 61-66页

作者： Zhen-Ming Xu Bin Wu Wen-Li Yang School of Physics Northwest UniversityXi'an 710127China Institute of Modern Physics Northwest UniversityXi'an 710127China Shaanxi Key Laboratory for Theoretical Physics Frontiers Xi'an 710127China peng huanwu center for fundamental theory Xi'an 710127China

Phase transition is a core content of black hole thermodynamics. This study adopted Kramer’s escape rate method for describing the Brownian motion of particles in an external field to investigate the intensity of the phase transition between small and large black hole states. Some existing studies mostly focused on the formal analysis of the thermodynamic phase transition of black holes, but they neglected the detailed description of the phase transition process. Our results show that the phase transition between small and large black holes for charged anti-de Sitter(AdS) black holes presents serious asymmetric features, and the overall process is dominated by the transition from a small black hole to a large black hole. This study filled a research gap of a stochastic process analysis on the issue of the first-order phase transition rate in the Ad S black hole.

关键词： black hole thermodynamics phase transition thermal potential Kramer’s escape rate

Quench Dynamics of Bose–Einstein Condensates in Boxlike Traps

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Chinese Physics Letters 2022年第7期39卷 18-23页

作者：杜荣邢健崇熊波郑俊辉杨涛 Shaanxi Key Laboratory for Theoretical Physics Frontiers Institute of Modern PhysicsNorthwest UniversityXi'an 710127China School of Science Wuhan University of TechnologyWuhan 430070China nsfc-sptp peng huanwu center for fundamental theory Xi'an 710127China

By quenching the interatomic interactions, we investigate the nonequilibrium dynamics of two-dimensional Bose–Einstein condensates in boxlike traps with power-law potential boundaries. We show that ring dark solitons can be excited during the quench dynamics for both concave and convex potentials. The quench's modulation strength and the steepness of the boundary are two major factors influencing the system's evolution. In terms of the number of ring dark solitons excited in the condensate, five dynamic regimes have been identified. The condensate undergoes damped radius oscillation in the absence of ring dark soliton excitations. When it comes to the appearance of ring dark solitons, their decay produces interesting structures. The excitation patterns for the concave potential show a nested structure of vortex-antivortex pairs. The dynamic excitation patterns for the convex potential, on the other hand, show richer structures with multiple transport behaviors.

关键词： BEC RDS Einstein Condensates in Boxlike Traps Quench Dynamics of Bose

Structure and dynamics of binary Bose−Einstein condensates with vortex phase imprinting

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Frontiers of physics 2023年第6期18卷 241-251页

作者： Jianchong Xing Wenkai Bai Bo Xiong Jun-Hui Zheng Tao Yang Shaanxi Key Laboratory for Theoretical Physics Frontiers Institute of Modern PhysicsNorthwest UniversityXi’an 710127China School of Science Wuhan University of TechnologyWuhan 430070China peng huanwu center for fundamental theory Xi’an 710127China

The combination of multi-component Bose−Einstein condensates(BECs)and phase imprinting techniques provides an ideal platform for exploring nonlinear dynamics and investigating the quantum transport properties of *** this paper,we study abundant density structures and corresponding dynamics of phase-separated binary Bose−Einstein condensates with phase-imprinted single vortex or vortex *** adjusting the ratio between the interspecies and intraspecies interactions,and the locations of the phase singularities,the typical density profiles such as ball-shell structures,crescent-gibbous structures,Matryoshka-like structures,sector-sector structures and sandwich-type structures appear,and the phase diagrams are *** dynamics of these structures exhibit diverse properties,including the penetration of vortex dipoles,emergence of half-vortex dipoles,co-rotation of sectors,and oscillation between *** pinning effects induced by a potential defect are also discussed,which is useful for controlling and manipulating individual quantum states.

关键词： Bose−Einstein condensates phase separation angular momentum energy competition

Quantized Superfluid Vortex Filaments Induced by the Axial Flow Effect

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Chinese Physics Letters 2020年第3期37卷 5-8页

作者：李浩刘冲杨战营杨文力 School of Physics Northwest UniversityXi'an 710127 Shaanxi Key Laboratory for Theoretical Physics Frontiers Xi'an 710127 nsfc-sptp peng huanwu center for fundamental theory Xi'an 710127 Institute of Modern Physics Northwest UniversityXi'an 710127

We report the quantized superfluid vortex filaments induced by the axial flow effect,which exhibit intriguing loop structures on helical *** new vortex filaments correspond to a series of soliton excitations including the multipeak soliton,W-shaped soliton,and anti-dark soliton,which have no analogue when the axial flow effect is *** particular,we show that the vortex filaments induced by the multipeak soliton and W-shaped soliton arise from the dual action of bending and twisting of the vortex,while the vortex filament induced by the anti-dark soliton is caused only by the bending action,which is consistent with the case of the standard bright *** results will deepen our understanding of breather-induced vortex filaments and will be helpful for controllable ring-like excitations on vortices.

关键词： soliton vortex bending

Exploring hidden-charm and hidden-strange hexaquark states from lattice QCD

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 30-37页

作者： Hang Liu Jinchen He Liuming Liu peng Sun Wei Wang Yi-Bo Yang Qi-An Zhang INPAC Key Laboratory for Particle Astrophysics and Cosmology(MOE)Shanghai Key Laboratory for Particle Physics and CosmologySchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Maryland center for fundamental Physics Department of PhysicsUniversity of MarylandCollege ParkMaryland 20742USA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023China Southern center for Nuclear-Science theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China International Centre for Theoretical Physics Asia-Pacific Beijing 100049/Hangzhou 310024China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Physics Beihang UniversityBeijing 102206China

Based on five different ensembles of newly generated(2+1)-flavor configurations with pion mass of approximately mπ■(140-310)MeV,we present a lattice analysis of hidden-charm and hidden-strange hexaquarks with the quark content■.The correlation matrices of two types of operators with JPC=0++,0-+,1++and 1--are simulated to extract the masses of the hexaquark candidates,which are subsequently extrapolated to the physical pion mass and continuum *** results indicate that ground state masses are below the■threshold and provide a characteristic signal for the experimental discovery of hexaquark candidates,which may enrich the versatile structure of multiquarks;moreover,it is an indispensable step to decipher the nonperturbative nature of the fundamental interactions of quarks and gluons.

关键词： quantum chromodynamics lattice QCD multiquark states

Magnetic moments of hidden-charm strange pentaquark states

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Chinese Physics C 2022年第12期46卷 194-207页

作者：高峰李浩松 School of Physics Northwest UniversityXi'an 710127China Institute of Modern Physics Northwest UniversityXi'an 710127China Shaanxi Key Laboratory for theoretical Physics Frontiers Xi'an 710127China peng huanwu center for fundamental theory Xi'an 710127China

In this study,the magnetic moments of hidden-charm strange pentaquark states with quantum numbers J^(P)=1^(±)/2,3^(±)/2,5^(±)/2,and 7^(+)/2 are calculated in the molecular,diquark-diquark-antiquark,and diquark-triquark *** numerical results demonstrate that the magnetic moments change for different spin-orbit couplings within the same model and when involving different models with the same angular momentum.

关键词： magnetic moment pentaquark molecular model diquark triquark

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鉴定最重QED原子的新方法

Science Bulletin 2024年第10期69卷 1386-1391页

作者：傅靖航贾森周兴玉张玉洁沈成平苑长征 School of Physics Beihang UniversityBeijing 100083China School of Physics Southeast UniversityNanjing 211189China School of Physics and Electronic Technology Liaoning Normal UniversityDalian 116029China peng huanwu Collaborative center for Research and Education Beihang UniversityBeijing 100191China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)and Institute of Modern Physics Fudan UniversityShanghai 200443China School of Physics Henan Normal UniversityXinxiang 453007China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

QED atoms are composed of unstructured and point-like lepton pairs bound together by the electromag-netic *** smallest and heaviest QED atom is formed by a τ^(+)τ^(-)***,the only known atoms of this type are the e^(+)e^(-)and μ^(+)e^(-)atoms,which were discovered 64 years ago and remain the sole examples found thus *** demonstrate that the J_(τ)(τ^(+)τ^(-) atom with J^(PC)=1^(--))atom signal can be observed with a significance larger than 5o including both statistical and systematic uncertainties,*** process e^(+)e^(-)→X^(+)Y^(-)E(X,Y=e,μ,π,K,or ρ,and E is the missing energy due to unobserved neutri-nos)with 1.5 ab^(-1)data taken around the τ pair production *** τ lepton mass can be measured with a precision of 1 keV with the same data *** is within one year's running time of the pro-posed super tau-charm facility in China or super charm-tau factory in Russia.

关键词： QED atom Tau lepton e^(+)e^(-)annihilation STCF SCTF