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Dynamical nonlinear excitations induced by interaction quench in a two-dimensional box-trapped Bose-Einstein condensate
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作者 牛真霞 高超 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第2期209-215,共7页
Manipulating nonlinear excitations,including solitons and vortices,is an essential topic in quantum many-body physics.A new progress in this direction is a protocol proposed in[Phys.Rev.Res.2043256(2020)]to produce da... Manipulating nonlinear excitations,including solitons and vortices,is an essential topic in quantum many-body physics.A new progress in this direction is a protocol proposed in[Phys.Rev.Res.2043256(2020)]to produce dark solitons in a one-dimensional atomic Bose–Einstein condensate(BEC)by quenching inter-atomic interaction.Motivated by this work,we generalize the protocol to a two-dimensional BEC and investigate the generic scenario of its post-quench dynamics.For an isotropic disk trap with a hard-wall boundary,we find that successive inward-moving ring dark solitons(RDSs)can be induced from the edge,and the number of RDSs can be controlled by tuning the ratio of the after-and before-quench interaction strength across different critical values.The role of the quench played on the profiles of the density,phase,and sound velocity is also investigated.Due to the snake instability,the RDSs then become vortex–antivortex pairs with peculiar dynamics managed by the initial density and the after-quench interaction.By tuning the geometry of the box traps,demonstrated as polygonal ones,more subtle dynamics of solitons and vortices are enabled.Our proposed protocol and the discovered rich dynamical effects on nonlinear excitations can be realized in near future cold-atom experiments. 展开更多
关键词 bose-einstein condensate quench interaction SOLITON vortex
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Effects of drive imbalance on the particle emission from a Bose-Einstein condensate in a one-dimensional lattice
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作者 赖龙泉 李照 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第3期238-243,共6页
Time-periodic driving has been an effective tool in the field of nonequilibrium quantum dynamics,which enables precise control of the particle interactions.We investigate the collective emission of particles from a Bo... Time-periodic driving has been an effective tool in the field of nonequilibrium quantum dynamics,which enables precise control of the particle interactions.We investigate the collective emission of particles from a Bose-Einstein condensate in a one-dimensional lattice with periodic drives that are separate in modulation amplitudes and relative phases.In addition to the enhancement of particle emission,we find that amplitude imbalances lead to energy shift and band broadening,while typical relative phases may give rise to similar gaps.These results offer insights into the specific manipulations of nonequilibrium quantum systems with tone-varying drives. 展开更多
关键词 bose-einstein condensate particle emission periodic drive
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Interference-induced suppression of particle emission from a Bose-Einstein condensate in lattice with time-periodic modulations
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作者 Long-Quan Lai Zhao Li 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第10期153-158,共6页
Emission of matter-wave jets from a parametrically driven condensate has attracted significant experimental and theoretical attention due to the appealing visual effects and potential metrological applications.In this... Emission of matter-wave jets from a parametrically driven condensate has attracted significant experimental and theoretical attention due to the appealing visual effects and potential metrological applications.In this work,we investigate the collective particle emission from a Bose-Einstein condensate confined in a one-dimensional lattice with periodically modulated interparticle interactions.We give the regimes for discrete modes,and find that the emission can be distinctly suppressed.The configuration induces a broad band,but few particles are ejected due to the interference of the matter waves.We further qualitatively model the emission process and demonstrate the short-time behaviors.This engineering provides a way to manipulate the propagation of particles and the corresponding dynamics of condensates in lattices,and may find application in the dynamical excitation control of other nonequilibrium problems with time-periodic driving. 展开更多
关键词 bose-einstein condensate matter-wave jet periodic modulation
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Coherence of nonlinear Bloch dynamics of Bose-Einstein condensates in deep optical lattices
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作者 张爱霞 张薇 +3 位作者 王杰 胡潇文 米来来 薛具奎 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期297-303,共7页
Atomic interaction leads to dephasing and damping of Bloch oscillations(BOs)in optical lattices,which limits observation and applications of BOs.How to obtain persistent BOs is particularly important.Here,the nonlinea... Atomic interaction leads to dephasing and damping of Bloch oscillations(BOs)in optical lattices,which limits observation and applications of BOs.How to obtain persistent BOs is particularly important.Here,the nonlinear Bloch dynamics of the Bose-Einstein condensate with two-body and three-body interactions in deep optical lattices is studied.The damping rate induced by interactions is obtained.The damping induced by two-body interaction plays a dominant role,while the damping induced by three-body interaction is weak.However,when the two-body and three-body interactions satisfy a threshold,long-lived coherent BOs are observed.Furthermore,the Bloch dynamics with periodical modulation of linear force is studied.The frequencies of linear force corresponding to resonance and pseudoresonance are obtained,and rich dynamical phenomena,i.e.,stable and strong BOs,drifting and dispersion of wave packet,are predicted.The controllable Bloch dynamics is provided with the periodic modulation of the linear force. 展开更多
关键词 bose-einstein condensate atomic interaction Bloch oscillations
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Nonlinear modes coupling of trapped spin-orbit coupled spin-1 Bose-Einstein condensates
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作者 王杰 梁俊成 +3 位作者 鱼自发 张安庆 张爱霞 薛具奎 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第9期163-171,共9页
We study analytically and numerically the nonlinear collective dynamics of quasi-one-dimensional spin-orbit coupled spin-1 Bose-Einstein condensates trapped in harmonic potential.The ground state of the system is dete... We study analytically and numerically the nonlinear collective dynamics of quasi-one-dimensional spin-orbit coupled spin-1 Bose-Einstein condensates trapped in harmonic potential.The ground state of the system is determined by minimizing the Lagrange density,and the coupled equations of motions for the center-of-mass coordinate of the condensate and its width are derived.Then,two low energy excitation modes in breathing dynamics and dipole dynamics are obtained analytically,and the mechanism of exciting the anharmonic collective dynamics is revealed explicitly.The coupling among spin-orbit coupling,Raman coupling and spin-dependent interaction results in multiple external collective modes,which leads to the anharmonic collective dynamics.The cooperative effect of spin momentum locking and spin-dependent interaction results in coupling of dipolar and breathing dynamics,which strongly depends on spin-dependent interaction and behaves distinct characters in different phases.Interestingly,in the absence of spin-dependent interaction,the breathing dynamics is decoupled from spin dynamics and the breathing dynamics is harmonic.Our results provide theoretical evidence for deep understanding of the ground sate phase transition and the nonlinear collective dynamics of the system. 展开更多
关键词 spin-orbit coupled spin-1 bose-einstein condenses collective excitations nonlinear modes coupling
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Landau damping of collective mode in a quasi-two-dimensional repulsive Bose-Einstein condensate 被引量:5
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作者 马晓栋 杨占金 +1 位作者 路俊哲 魏蔚 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第7期81-87,共7页
We investigate the Landau damping of the collective mode in a quasi-two-dimension repulsive Bose-Einstein condensate by using the self-consistent time-dependent Hatree-Fock-Bogoliubov approximation and a complete and ... We investigate the Landau damping of the collective mode in a quasi-two-dimension repulsive Bose-Einstein condensate by using the self-consistent time-dependent Hatree-Fock-Bogoliubov approximation and a complete and orthogonal eigenfunction set for the elementary excitation of the system. We calculate the three-mode coupling matrix element between the collective mode and the thermal excited quasi-particles and the Landau damping rate of the collective mode. We discuss the dependence of the Landau damping on temperature, on atom number in the condensate, on transverse trapping frequency and on the length of the condensate. The energy width of the collective mode is taken into account in our calculation. With little approximation, our theoretic calculation results agree well with the experimental ones and are helpful for deducing the damping mechanics and the inter-particle interaction. 展开更多
关键词 bose-einstein condensate Landau damping Hatree-Fock-Bogoliubov approximation energy level width
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Landau damping of collective modes in a harmonically trapped Bose-Einstein condensate 被引量:4
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作者 马晓栋 周昱 +1 位作者 马永利 黄国翔 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第8期1871-1878,共8页
This paper proposes a method for calculating the Landau damping of a low-energy collective mode in a harmonically trapped Bose-Einstein condensate. Based on the divergence-free analytical solutions for ground-state wa... This paper proposes a method for calculating the Landau damping of a low-energy collective mode in a harmonically trapped Bose-Einstein condensate. Based on the divergence-free analytical solutions for ground-state wavefunction of the condensate and eigenvalues and eigenfunctions for thermally excited quasiparticles, obtained beyond Thomas-Fermi approximation, this paper calculates the coupling matrix elements describing the interaction between the collective mode and the quasiparticles. With these analytical results this paper evaluates the Landau damping rate of a monopole mode in a spherical trap and discusses its dependence on temperature, particle number and trapping frequency of the system. 展开更多
关键词 bose-einstein condensation collective modes Landau damping
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The stability of Bose-Einstein condensates in a two-dimensional shallow trap 被引量:3
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作者 周小燕 穆爱霞 薛具奎 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第11期3197-3203,共7页
The stability of Bose Einstein condensates (BECs) loaded into a two-dimensional shallow harmonic potential well is studied. By using the variational method, the ground state properties for interacting BECs in the sh... The stability of Bose Einstein condensates (BECs) loaded into a two-dimensional shallow harmonic potential well is studied. By using the variational method, the ground state properties for interacting BECs in the shallow trap are discussed. It is shown that the possible stable bound state can exist. The depth of the shallow well plays an important role in stabilizing the BECs, The stability of BECs in the shallow trap with the periodic modulating of atom interaction by using the Feshbach resonance is also discussed. The results show that the collapse and diffusion of BECs in a shallow trap can be controlled by the temporal modulation of the scattering length. 展开更多
关键词 bose-einstein condensates shallow harmonic potential well STABILITY
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Nonlinear transport of Bose-Einstein condensates in a double barrier potential 被引量:3
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作者 方见树 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第11期3996-4001,共6页
The stable nonlinear transport of the Bose-Einstein condensates through a double barrier potential in a waveguide is studied. By using the direct perturbation method we have obtained a perturbed solution of Cross-Pita... The stable nonlinear transport of the Bose-Einstein condensates through a double barrier potential in a waveguide is studied. By using the direct perturbation method we have obtained a perturbed solution of Cross-Pitaevskii equation. Theoretical analysis reveals that this perturbed solution is a stable periodic solution, which shows that the transport of Bose-Einstein condensed atoms in this system is a stable nonlinear transport. The corresponding numerical results are in good agreement with the theoretical analytical results. 展开更多
关键词 the nonlinear transport bose-einstein condensate perturbed solution
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Effects of three-body interaction on collective excitation and stability of Bose-Einstein condensate 被引量:2
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作者 彭娉 李冠强 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第8期3221-3225,共5页
This paper investigates the collective excitation and stability of low-dimensional Bose-Einstein condensates with two- and three-body interactions by the variational analysis of the time-dependent Gross-Pitaevskii-Gin... This paper investigates the collective excitation and stability of low-dimensional Bose-Einstein condensates with two- and three-body interactions by the variational analysis of the time-dependent Gross-Pitaevskii-Ginsburg equation. The spectrum of the low-energy excitation and the effective potential for the width of the condensate axe obtained. The results show that: (i) the repulsive two-body interaction among atoms makes the frequency red-shifted for the internal excitation and the repulsive or attractive three-body interaction always makes it blue-shifted; (ii) the region for the existence of the stable bound states is obtained by identifying the critical value of the two- and three-body interactions. 展开更多
关键词 bose-einstein condensate three-body interaction collective excitation stable bound states
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Generation and control of chaos in a Bose-Einstein condensate 被引量:2
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作者 徐军 海文华 李辉 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第8期2244-2253,共10页
For a Bose-Einstein condensate (BEC) confined in a double lattice consisting of two weak laser standing waves we find the Melnikov chaotic solution and chaotic region of parameter space by using the direct perturbat... For a Bose-Einstein condensate (BEC) confined in a double lattice consisting of two weak laser standing waves we find the Melnikov chaotic solution and chaotic region of parameter space by using the direct perturbation method. In the chaotic region, spatial evolutions of the chaotic solution and the corresponding distribution of particle number density are bounded but unpredictable between their superior and inferior limits. It is illustrated that when the relation k1≈ k2 between the two laser wave vectors is kept, the adjustment from k2 〈 k1 to k2 ≥ k1 can transform the chaotic region into regular one or the other way round. This suggests a feasible scheme for generating and controlling chaos, which could lead to an experimental observation in the near future. 展开更多
关键词 bose-einstein condensate double lattice chaotic region control
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New Families of Soliton and Periodic Solutions of Bose-Einstein Condensation in Linear Magnetic Field and Time-Dependent Laser Field 被引量:2
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作者 MEI Jian-Qin ZHANG Hong-Qing 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第2X期209-212,共4页
By using a new generally projective Riccati equation method and with the help of symbolic computation,we consider a nonlinear Gross-Pitaevskii equation with weak bias magnetic and time-dependent laser fields. As a res... By using a new generally projective Riccati equation method and with the help of symbolic computation,we consider a nonlinear Gross-Pitaevskii equation with weak bias magnetic and time-dependent laser fields. As a result,some new soliton solutions, rational function solution, and periodic solutions are obtained. 展开更多
关键词 bose-einstein condensation Gross-Pitaevskii equation soliton solution periodic solution
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Spatial Chaos of Bose-Einstein Condensates in a Cigar-Shaped Trap 被引量:2
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作者 LI Fei REN Zhong-Zhou LUO Hai-Lu SHU Wei-Xing Department of Physics,Nanjing University,Nanjing 210008,ChinaWU Qin School of Basic Medical Science,Guangdong Medical College,Dongguan 523808,China 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第7期107-111,共5页
The spatial chaos of Bose-Einstein condensates in a cigar-shaped trap is studied.For a system with asteady current,we construct the general solution of the 1st-order equation.From the boundedness condition of thegener... The spatial chaos of Bose-Einstein condensates in a cigar-shaped trap is studied.For a system with asteady current,we construct the general solution of the 1st-order equation.From the boundedness condition of thegeneral solution, we obtain the Melnikov function predicting the onset of chaos.The unpredictability of the system's dis-tribution of atom density is also theoretically analyzed.For a ^(23)Na system meeting the perturbation oondition,numericalsimulations show the existence of chaos,which is in accordance with our analytical results.Numerical simulations of a^(87)Rb system dissatisfying the perturbation condition also demonstrate that there exists chaos in the system.The casewithout a current is also investigated. 展开更多
关键词 bose-einstein condensates Melnikov function CHAOS
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Tunneling dynamics of Bose-Einstein condensates with higher-order interactions in optical lattice 被引量:2
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作者 铁璐 薛具奎 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第12期95-100,共6页
The nonlinear Landau Zener tunneling and nonlinear Rabi oscillations of Bose-Einstein condensate (BEC) with higher-order atomic interaction between the Bloch bands in an accelerating optical lattice are discussed. W... The nonlinear Landau Zener tunneling and nonlinear Rabi oscillations of Bose-Einstein condensate (BEC) with higher-order atomic interaction between the Bloch bands in an accelerating optical lattice are discussed. Within the two-level model, the tunneling probability of BEC with higher-order atomic interaction between Bloch bands is obtained. We finds that the tunneling rate is closely related to the higher-order atomic interaction. Furthermore, the nonlinear Rabi oscillations of BEC with higher-order atomic interaction between the bands are discussed by imposing a periodic modulation on the level bias. Analytical expressions of the critical higher-order atomic interaction for suppressing/enhancing the Rabi oscillations are obtained. It is shown that the critical value strongly depends on the modulation parameters (i.e., the modulation amplitude and frequency) and the strength of periodic potential. 展开更多
关键词 bose-einstein condensates optical lattices higher-order interactions
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Stability of trapped Bose-Einstein condensates in one-dimensional tilted optical lattice potential 被引量:1
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作者 方见树 廖湘萍 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第4期80-84,共5页
Using the direct perturbation technique, this paper obtains a general perturbed solution of the Bose-Einstein condensates trapped in one-dimensional tilted optical lattice potential. We also gave out two necessary and... Using the direct perturbation technique, this paper obtains a general perturbed solution of the Bose-Einstein condensates trapped in one-dimensional tilted optical lattice potential. We also gave out two necessary and sufficient conditions for boundedness of the perturbed solution. Theoretical analytical results and the corresponding numerical results show that the perturbed solution of the Bose-Einstein condensate system is unbounded in general and indicate that the Bose-Einstein condensates are Lyapunov-unstable. However, when the conditions for boundedness of the perturbed solution are satisfied, then the Bose-Einstein condensates are Lyapunov-stable. 展开更多
关键词 bose-einstein condensate CHAOS STABILITY tilted optical lattice potential
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Energy Spectrum of Two-Component Bose-Einstein Condensates in Optical Lattices 被引量:1
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作者 HANJiu-Rong LIUJin-Ming +1 位作者 JINGHui WANGYu-Zhu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第5期809-813,共5页
With the method of Green's function, we investigate the energy spectra of two-component ultracold bosonic atoms in optical lattices. We End that there are two energy bands for each component. The critical conditio... With the method of Green's function, we investigate the energy spectra of two-component ultracold bosonic atoms in optical lattices. We End that there are two energy bands for each component. The critical condition of the superfluid-Mott insulator phase transition is determined by the energy band structure. We also find that the nearest neighboring and on-site interactions fail to change the structure of energy bands, but shift the energy bands only. According to the conditions of the phase transitions, three stable superfluid and Mott insulating phases can be found by adjusting the experiment parameters. We also discuss the possibility of observing these new phases and their transitions in further experiments. 展开更多
关键词 energy spectrum phase transition bose-einstein condensates optical lattice
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Dynamic stability and manipulation of bright matter-wave solitons by optical lattices in Bose-Einstein condensates 被引量:1
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作者 Song Chang-Sheng Li Jing Zong Feng-De 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第2期98-106,共9页
An extended variation approach to describing the dynamic evolution of self-attractive Bose-Einstein condensates is developed. We consider bright matter-wave solitons in the presence of a parabolic magnetic potential a... An extended variation approach to describing the dynamic evolution of self-attractive Bose-Einstein condensates is developed. We consider bright matter-wave solitons in the presence of a parabolic magnetic potential and a timespace periodic optical lattice. The dynamics of condensates is shown to be well approximated by four coupled nonlinear differential equations. A noteworthy feature is that the extended variation approach gives a critical strength ratio to support multiple stable lattice sites for the condensate. We further examine the existence of the solitons and their stabilities at the multiple stable lattice sites. In this case, the analytical predictions of Bose-Einstein condensates variational dynamics are found to be in good agreement with numerical simulations. We then find a stable region for successful manipulating matter-wave solitons without collapse, which are dragged from an initial stationary to a prescribed position by a moving periodic optical lattice. 展开更多
关键词 bose-einstein condensates Gross-Pitaevskii equation matter-wave solitons controlled manipulation
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Adjustable half-skyrmion chains induced by SU(3)spin-orbit coupling in rotating Bose-Einstein condensates 被引量:1
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作者 Li Wang Ji Li +2 位作者 Xiao-Lin Zhou Xiang-Rong Chen Wu-Ming Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第11期261-267,共7页
The ground state properties of the rotating Bose–Einstein condensates(BECs) with SU(3) spin–orbit coupling(SOC)in a two-dimensional harmonic trap are studied. The results show that the ferromagnetic and antiferromag... The ground state properties of the rotating Bose–Einstein condensates(BECs) with SU(3) spin–orbit coupling(SOC)in a two-dimensional harmonic trap are studied. The results show that the ferromagnetic and antiferromagnetic systems present three half-skyrmion chains at an angle of 120°to each other along the coupling directions. With the enhancement of isotropic SU(3) SOC strength, the position of the three chains remains unchanged, in which the number of half-skyrmions increases gradually. With the increase of rotation frequency and atomic density–density interaction, the number of halfskyrmions on the three chains and in the regions between two chains increases gradually. The relationships of the total number of half-skyrmions on the three chains with the increase of SU(3) SOC strength, rotation frequency and atomic density–density interaction are also given. In addition, changing the anisotropic SU(3) SOC strength can regulate the number and morphology of the half-skyrmion chains. 展开更多
关键词 bose-einstein condensates SU(3)spin-orbit coupling ROTATION half-skyrmion chains
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Influence of Decoherence on Interference Between Two Bose-Einstein Condensates 被引量:1
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作者 ZENGAi-Hua KUANGLe-Man 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第1期41-44,共4页
The influence of decoherence on interference between two trapped Bose-Einstein condensates with arbitraryinitial states is studied. Analytic expressions of the intensity and visibility of the interference pattern are ... The influence of decoherence on interference between two trapped Bose-Einstein condensates with arbitraryinitial states is studied. Analytic expressions of the intensity and visibility of the interference pattern are found. It isshown that the decoherence weakens the interference intensity and decreases the visibility of the interference pattern. 展开更多
关键词 bose-einstein condensate DECOHERENCE INTERFERENCE
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Effect of interaction strength on gap solitons of Bose-Einstein condensates in optical lattices 被引量:1
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作者 杨如曙 杨江河 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第4期1189-1195,共7页
We have developed a systematic analytical approach to the study on the dynamic properties of the linear and the nonlinear excitations for quasi-one-dimensional Bose-Einstein condensate trapped in optical lattices. A n... We have developed a systematic analytical approach to the study on the dynamic properties of the linear and the nonlinear excitations for quasi-one-dimensional Bose-Einstein condensate trapped in optical lattices. A novel linear dispersion relation and an algebraic soliton solution of the condensate are derived analytically under consideration of Bose-Einstein condensate with a periodic potential. By analysing the soliton solution, we find that the interatomic interaction strength has an important effect on soliton dynamic properties of Bose-Einstein condensate. 展开更多
关键词 bose-einstein condensates SOLITONS optical lattices
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