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Elliptic Function Waves of Spinor Bose-Einstein Condensates in an Optical Lattice 被引量:2
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作者 XIE Yuan-Dong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第3期445-449,共5页
An improved nonlinear Schrodinger equation different from usual one of spinor Bose-Einstein condensates (BECs) in an optical lattice are obtained by taking into account a nonlinear term in the equation of motion for... An improved nonlinear Schrodinger equation different from usual one of spinor Bose-Einstein condensates (BECs) in an optical lattice are obtained by taking into account a nonlinear term in the equation of motion for probability amplitude of spins carefully. The elliptic function wave solutions of the model are found under specific boundary condition, for example, the two ends of the atomic chain are fixed. In the case of limit the elliptic function wave solutions are reduced into spin-wave-like or solitons. 展开更多
关键词 spinor bose einstein condensates optical lattice elliptic tunction wave solution SOLITON
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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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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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Tunable ground-state solitons in spin–orbit coupling Bose–Einstein condensates in the presence of optical lattices 被引量:1
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作者 张华峰 陈方 +2 位作者 郁春潮 孙利辉 徐大海 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第8期54-60,共7页
Properties of the ground-state solitons, which exist in the spin-orbit coupling (SOC) Bose-Einstein condensates (BEC) in the presence of optical lattices, are presented. Results show that several system parameters... Properties of the ground-state solitons, which exist in the spin-orbit coupling (SOC) Bose-Einstein condensates (BEC) in the presence of optical lattices, are presented. Results show that several system parameters, such as SOC strength, lattice depth, and lattice frequency, have important influences on properties of ground state solitons in SOC BEC. By controlling these parameters, structure and spin polarization of the ground-state solitons can be effectively tuned, so ma- nipulation of atoms may be realized. 展开更多
关键词 spin-orbit coupling bose-einstein condensates optical lattices
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Landau-Zener Tunnelling of Two-Component Bose-Einstein Condensates in Optical Lattices
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作者 彭娉 李冠强 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第7期101-106,共6页
We investigate the Landau-Zener tunnelling of two-component Bose-Einstein condensates (BECs) in optical lattices. In the neighborhood of the Brillouin zone edge, the system can be reduced to two coupled nonlinear tw... We investigate the Landau-Zener tunnelling of two-component Bose-Einstein condensates (BECs) in optical lattices. In the neighborhood of the Brillouin zone edge, the system can be reduced to two coupled nonlinear two-level models. From the models, we calculate the change of the tunnelling probability for each component with the linear sweeping rate. It is found that the probability for each component exhibits regular oscillating behavior for the larger sweeping rate, but for smaller rate the oscillation is irregular. Moreover, the asymmetry of the tunnelling between the two components can be induced by the unbalanced initial populations or the inequality of the two self-interactions when the cross-interaction between the components exists. The result can not be found in the single component BECs. 展开更多
关键词 Landau Zener tunnelling two-component bose einstein condensates optical lattices
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Stationary Classical Chaos of Trapped Two-Component Bose-Einstein Condensates in 1-D Optical Lattice Potentials
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作者 FANG Jian-Shu LIU Wing-Ki ZHU Shan-Hua1 Institute of Physics,Hunan University of Technology,Zhuzhou 412008,China2 Department of Physics,Hunan Normal University,Changsha 410081,China3 Department of Physics,University of Waterloo,Waterloo,Ontario,Canada N2L 3G1 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第7期125-131,共7页
We study the nonlinear dynamics of two-component Bose-Einstein condensates in one-dimensional pe-riodic optical lattice potentials.The stationary state perturbation solutions of the coupled two-component nonlinearSchr... We study the nonlinear dynamics of two-component Bose-Einstein condensates in one-dimensional pe-riodic optical lattice potentials.The stationary state perturbation solutions of the coupled two-component nonlinearSchr?dinger/Gross-Pitaevskii equations are constructed by using the direct perturbation method.Theoretical analysisrevels that the perturbation solution is the chaotic one,which indicates the existence of chaos and chaotic region inparameter space.The corresponding numerical calculation results agree well with the analytical results.By applying thechaotic perturbation solution,we demonstrate the atomic spatial population and the energy distribution of the systemare chaotic generally. 展开更多
关键词 stationary state classical chaos two-component bose-einstein condensates optical lattice potential
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Effects of periodic optical lattice potential on dark solitons in a Bose Einstein condensate
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作者 李宏 王东宁 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第11期4726-4733,共8页
This paper investigates the dynamics of dark solitons in a Bose-Einstein condensate with a magnetic trap and an optical lattice (OL) trap, and analyses the effects of the periodic OL potential on the dynamics by app... This paper investigates the dynamics of dark solitons in a Bose-Einstein condensate with a magnetic trap and an optical lattice (OL) trap, and analyses the effects of the periodic OL potential on the dynamics by applying the variational approach based on the renormalized integrals of motion. The results show that the dark soliton becomes only a standing-wave and free propagation of the dark soliton is not possible when the periodic length of the OL potential is approximately equal to the effective width of the dark soliton. When the periodic length is very small or very large, the effects of the OL potential on the dark soliton will be sharply reduced. Finally, the numerical results confirm these theoretical findings. 展开更多
关键词 bose-einstein condensate dark soliton magnetic potential optical lattice potential
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Dynamical stability of dipolar condensate in a parametrically modulated one-dimensional optical lattice
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作者 Ji-Li Ma Xiao-Xun Li +2 位作者 Rui-Jin Cheng Ai-Xia Zhang Ju-Kui Xue 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第6期143-148,共6页
We study the stabilization properties of dipolar Bose–Einstein condensate in a deep one-dimensional optical lattice with an additional external parametrically modulated harmonic trap potential. Through both analytica... We study the stabilization properties of dipolar Bose–Einstein condensate in a deep one-dimensional optical lattice with an additional external parametrically modulated harmonic trap potential. Through both analytical and numerical methods, we solve a dimensionless nonlocal nonlinear discrete Gross–Pitaevskii equation with both the short-range contact interaction and the long-range dipole–dipole interaction. It is shown that, the stability of dipolar condensate in modulated deep optical lattice can be controled by coupled effects of the contact interaction, the dipolar interaction and the external modulation. The system can be stabilized when the dipolar interaction, the contact interaction, the average strength of potential and the ratio of amplitude to frequency of the modulation satisfy a critical condition. In addition, the breather state, the diffused state and the attractive-interaction-induced-trapped state are predicted. The dipolar interaction and the external modulation of the lattice play important roles in stabilizing the condensate. 展开更多
关键词 boseeinstein condensate optical lattice dipole–dipole interaction periodic modulation
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Dynamical properties of ultracold Bose atomic gases in one-dimensional optical lattices created by two schemes
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作者 Jiang Zhu Cheng-Ling Bian Hong-Chen Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第9期175-179,共5页
An optical lattice could be produced either by splitting an input light(splitting scheme) or by reflecting the input light by a mirror(retro-reflected scheme).We study quantum dynamical properties of an atomic Bose-Ei... An optical lattice could be produced either by splitting an input light(splitting scheme) or by reflecting the input light by a mirror(retro-reflected scheme).We study quantum dynamical properties of an atomic Bose-Einstein condensate(BEC) in the two schemes.Adopting a mean field theory and neglecting collision interactions between atoms, we find that the momentum and spatial distributions of BEC are always symmetric in the splitting scheme which, however, are asymmetric in the retro-reflected scheme.The reason for this difference is due to the local field effect.Furthermore, we propose an effective method to avoid asymmetric diffraction. 展开更多
关键词 optical lattice bose-einstein condensATE local field effect
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Cyclotron dynamics of neutral atoms in optical lattices with additional magnetic field and harmonic trap potential
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作者 Ai-Xia Zhang Ying Zhang +3 位作者 Yan-Fang Jiang Zi-Fa Yu Li-Xia Cai Ju-Kui Xue 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第1期156-163,共8页
We analytically and numerically discuss the stability and dynamics of neutral atoms in a two-dimensional optical lattice subjected to an additional harmonic trap potential and artificial magnetic field.The harmonic tr... We analytically and numerically discuss the stability and dynamics of neutral atoms in a two-dimensional optical lattice subjected to an additional harmonic trap potential and artificial magnetic field.The harmonic trap potential plays a key role in modifying the equilibrium state properties of the system and stabilizing the cyclotron orbits of the condensate.Meanwhile,the presence of the harmonic trap potential and lattice potential results in rich cyclotron dynamics of the condensate.The coupling effects of lattice potential,artificial magnetic field,and harmonic trap potential lead to single periodic,multi-periodic or quasi-periodic cyclotron orbits of the condensate.So we can control the cyclotron dynamics of neutral atoms in optical lattice by manipulating the strength of harmonic confinement,artificial magnetic field,and initial conditions.Our results provide a direct theoretical evidence for the cyclotron dynamics of neutral atoms in optical lattices exposed to the artificial gauge magnetic field and harmonic trap potential. 展开更多
关键词 boseeinstein condensate artificial magnetic field optical lattice
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Superfluid to Mott-insulator transition in a one-dimensional optical lattice
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作者 Wenliang Liu Ningxuan Zheng +9 位作者 Jun Jian Li Tian Jizhou Wu Yuqing Li Yongming Fu Peng Li Vladimir Sovkov Jie Ma Liantuan Xiao Suotang Jia 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第7期268-271,共4页
Bose–Einstein condensates(BEC)of sodium atoms are transferred into one-dimensional(1D)optical lattice potentials,formed by two laser beams with a wavelength of 1064 nm,in a shallow optical trap.The phase coherence of... Bose–Einstein condensates(BEC)of sodium atoms are transferred into one-dimensional(1D)optical lattice potentials,formed by two laser beams with a wavelength of 1064 nm,in a shallow optical trap.The phase coherence of the condensate in the lattice potential is studied by changing the lattice depth.A qualitative change in behavior of the BEC is observed at a lattice depth of~13.7Er,where the quantum gas undergoes a transition from a superfluid state to a state that lacks well-to-well phase coherence. 展开更多
关键词 boseeinstein condensate optical lattice SUPERFLUID Mott-insulator phase
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Dynamics of Bose-Einstein condensates in a one-dimensional optical lattice with double-well potential 被引量:3
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作者 Han-Lei Zheng Qiang Gu 《Frontiers of physics》 SCIE CSCD 2013年第4期375-380,共6页
We study dynamical behaviors of the weakly interacting Bose-Einstein condensate in the one- dimensional optical lattice with an overall double-well potential by solving the time-dependent Gross-Pitaevskii equation. It... We study dynamical behaviors of the weakly interacting Bose-Einstein condensate in the one- dimensional optical lattice with an overall double-well potential by solving the time-dependent Gross-Pitaevskii equation. It is observed that the double-well potential dominates the dynamics of such a system even if the lattice depth is several times larger than the height of the double-well potential. This result suggests that the condensate flows without resistance in the periodic lattice just like the case of a single particle moving in periodic potentials. Nevertheless, the effective mass of atoms is increased, which can be experimentally verified since it is connected to the Josephson oscillation frequency. Moreover, the periodic lattice enhances the nonlinearity of the double-well condensate, making the condensate more "self-trapped" in the ^-mode self-trapping regime. 展开更多
关键词 bose-einstein condensate double-well potential optical lattice dynamical behavior
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Gap-type dark localized modes in a Bose-Einstein condensate with optical lattices 被引量:6
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作者 Liangwei Zeng Jianhua Zeng 《Advanced Photonics》 EI CSCD 2019年第4期32-41,共10页
Bose-Einstein condensate(BEC)exhibits a variety of fascinating and unexpected macroscopic phenomena,and has attracted sustained attention in recent years-particularly in the field of solitons and associated nonlinear ... Bose-Einstein condensate(BEC)exhibits a variety of fascinating and unexpected macroscopic phenomena,and has attracted sustained attention in recent years-particularly in the field of solitons and associated nonlinear phenomena.Meanwhile,optical lattices have emerged as a versatile toolbox for understanding the properties and controlling the dynamics of BEC,among which the realization of bright gap solitons is an iconic result.However,the dark gap solitons are still experimentally unproven,and their properties in more than one dimension remain unknown.In light of this,we describe,numerically and theoretically,the formation and stability properties of gap-type dark localized modes in the context of ultracold atoms trapped in optical lattices.Two kinds of stable dark localized modes-gap solitons and soliton clusters-are predicted in both the one-and two-dimensional geometries.The vortical counterparts of both modes are also constructed in two dimensions.A unique feature is the existence of a nonlinear Bloch-wave background on which all above gap modes are situated.By employing linear-stability analysis and direct simulations,stability regions of the predicted modes are obtained.Our results offer the possibility of observing dark gap localized structures with cutting-edge techniques in ultracold atoms experiments and beyond,including in optics with photonic crystals and lattices. 展开更多
关键词 boseeinstein condensates optical lattices photonic crystals and lattices self-defocusing Kerr nonlinearity dark gap solitons and soliton clusters
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Quantum Entanglement of Many Distant Bose–Einstein Condensates in an Optical Lattice by Interference
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作者 刘亚峰 邹旭波 郭光灿 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第7期13-16,共4页
We propose a scheme to generate maximally entangled states of two distant Bose–Einstein condensates,which are trapped in different potential wells of a one-dimensional optical lattice. We show how such maximally enta... We propose a scheme to generate maximally entangled states of two distant Bose–Einstein condensates,which are trapped in different potential wells of a one-dimensional optical lattice. We show how such maximally entangled state can be used to test the Bell inequality and realize quantum teleportation of a Bose–Einstein condensate state. The scheme proposed here is based on the interference of Bose-Einstein condensates leaking out from different potential wells of optical lattice. It is briefly pointed out that this scheme can be extended to generate maximally entangled Greenberger–Horne–Zeilinger(GHZ) states of 2m(m > 1) distant Bose–Einstein condensates. 展开更多
关键词 quantum ENTANGLEMENT boseeinstein condensates optical lattice cold atomic
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Pulse loading ^(87)Rb Bose-Einstein condensation in optical lattice:the Kapitza-Dirac scattering and temporal matter-wave-dispersion Talbot effect
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作者 陈海霞 熊德智 +1 位作者 王鹏军 张靖 《Chinese Optics Letters》 SCIE EI CAS CSCD 2010年第4期348-350,共3页
We study ^(87)Rb Bose-Einstein condensation(BEC) loading into the pulse of the one-dimensional(1D) optical lattice experimentally.The lattice is turned on abruptly,held constant for a variable time,and then turn... We study ^(87)Rb Bose-Einstein condensation(BEC) loading into the pulse of the one-dimensional(1D) optical lattice experimentally.The lattice is turned on abruptly,held constant for a variable time,and then turned off abruptly.The measurement of the depth of the optical lattice is obtained by Kapitza-Dirac scattering.The temporal matter-wave-dispersion Talbot effect with ^(87)Rb BEC is observed by applying a pair of pulsed standing waves(as pulsed phase gratings) with the separation of a variable delay. 展开更多
关键词 bose einstein condensation condensATION Crystal lattices Fermi level optical materials RUBIDIUM Sound reproduction Statistical mechanics
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Critical temperature and condensed fraction of Bose-Einstein condensation in optical lattices
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作者 YU XueCai HUANG Xue YE YuTang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2007年第2期177-184,共8页
Critical temperature and condensate fraction of Bose-Einstein condensation in the optical lattice are studied. The results show that the critical temperature in optical lattices can be characterized with an equivalent... Critical temperature and condensate fraction of Bose-Einstein condensation in the optical lattice are studied. The results show that the critical temperature in optical lattices can be characterized with an equivalent critical temperature in a single lattice, which provide a fast evaluation of critical temperature and condensate fraction of Bose-Einstein condensation confined with pure optical trap. Critical temperature can be estimated with an equivalent critical temperature. It is predicted that critical temperature is proportional to q ?3/2 in q number lattices for superfluid state and should be equal to that in a single lattic for Mott insulate state. Required potential depth or Rabi frequency and maximum atom number in the lattices both for superfluid state and Mott state are presented based on views of thermal mechanical statistics. 展开更多
关键词 bose-einstein condensATION critical temperature optical lattice SUPERFLUID STATE MOTT insulate STATE
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Periodically modulated interaction effect on transport of Bose–Einstein condensates in lattice with local defects 被引量:1
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作者 Kun-Qiang Zhu Zi-Fa Yu +3 位作者 Ji-Ming Gao Ai-Xia Zhang Hong-Ping Xu Ju-Kui Xue 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第1期245-250,共6页
We theoretically investigate the periodically modulated interaction effect on the propagation properties of a traveling plane wave in a Bose–Einstein condensate(BEC) trapped in a deep annular lattice with local defec... We theoretically investigate the periodically modulated interaction effect on the propagation properties of a traveling plane wave in a Bose–Einstein condensate(BEC) trapped in a deep annular lattice with local defects both analytically and numerically. By using the two-mode ansatz and the tight-binding approximation, a critical condition for the system preserving the superfluidity is obtained analytically and confirmed numerically. We find that the coupled effects of periodic modulated atomic interactions, the quasi-momentum of the plane wave, and the defect can control the superfluidity of the system. Particularly, when we consider the periodic modulation in the system with single defect, the critical condition for the system entering the superfluid regime depends on both the defect and the momentum of the plane wave. This is different from the case for the system without the periodic modulation, where the critical condition is only determined by the defect. The modulation and quasi-momentum of the plane wave can enhance the system entering the superfluid regime. Interestingly, when the modulated amplitude/frequency, the defect strength, and the quasi-momentum of the plane wave satisfy a certain condition, the system will always be in the superfluid region. This engineering provides a possible means for studying the periodic modulation effect on propagation properties and the corresponding dynamics of BECs in disordered optical lattices. 展开更多
关键词 boseeinstein condensATE periodic modulation SUPERFLUIDITY lattice with defects
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Controllable optical bistability of Bose-Einstein condensate in an optical cavity with a Kerr medium 被引量:1
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作者 郑强 栗生长 +2 位作者 张小平 游泰杰 傅立斌 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第9期229-233,共5页
We study the optical bistability for a Bose-Einstein condensate of atoms in a driven optical cavity with a Kerr medium. We find that both the threshold point of optical bistability transition and the width of optical ... We study the optical bistability for a Bose-Einstein condensate of atoms in a driven optical cavity with a Kerr medium. We find that both the threshold point of optical bistability transition and the width of optical bistability hysteresis can be controlled by appropriately adjusting the Kerr interaction between the photons. In particular, we show that the optical bistability will disappear when the Kerr interaction exceeds a critical value. 展开更多
关键词 bose-einstein condensate optical bistability Kerr interaction
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Production of ^(87)Rb Bose Einstein condensates in a hybrid trap
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作者 段亚凡 姜伯楠 +3 位作者 孙剑芳 刘亢亢 徐震 王育竹 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第5期417-420,共4页
We report a rapid evaporative cooling method using a hybrid trap which is composed of a quadrupole magnetic trap and a one-beam optical dipole trap. It contains two kinds of evaporative coolings to reach the quantum d... We report a rapid evaporative cooling method using a hybrid trap which is composed of a quadrupole magnetic trap and a one-beam optical dipole trap. It contains two kinds of evaporative coolings to reach the quantum degeneracy: initial radio-frequency (RF) enforced evaporative cooling in the quadrupole magnetic trap and further runaway evaporative cooling in the optical dipole trap. The hybrid trap does not require a very high power laser such as that in the traditional pure optical trap, but still has a deep trap depth and a large trap volume, and has better optical access than the normal magnetic trap like the quadrupole-Ioffe-configuration (QUIC) cloverleaf trap. A high trap frequency can be easily realized in the hybrid trap to enhance the elastic collision rate and shorten the evaporative cooling time. In our experiment, pure Bose-Einstein condensates (BECs) with about 1 x 105 atoms can be realized in 6 s evaporative cooling in the optical dipole trap. 展开更多
关键词 ultra-cold atoms bose-einstein condensates optical dipole trap hybrid trap
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