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Localized Asymmetric Atomic Matter Waves in Two-Component Bose-Einstein Condensates Coupled with Two-Photon Microwave Field

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Communications in Theoretical Physics 2008年第5期49卷 1225-1228页

作者： XIONG Bo Beijing National Laboratory for Condensed Matter Physics Institute of Physics the Chinese Academy of SciencesBeijing 100080 China

We investigate localized atomic matter waves in the two-photon microwave field. Interestingly, the oscillations two-component Bose-Einstein condensates coupled by of localized atomic matter waves will gradually decay and finally become non-oscillating behavior even if existing coupling field. In particular, atom numbers occupied in two different hyperfine spin states will appear asymmetric occupations after some time evolution.

关键词： Bose Einstein condensate feshbach resonance soliton Josephson effect

Tunneling Dynamics Between Atomic and Molecular Bose-Einstein Condensates

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Communications in Theoretical Physics 2004年第4期41卷 547-552页

作者： CHENChang-Yong DepartmentofPhysics LoudiTeachers＇CollegeLoudi417000China

Tunneling dynamics of multi-atomic molecules between atomic and multi-atomic molecular Bose-Einstein condensates with feshbach resonance is *** is indicated that the tunneling in the two Bose-Einstein condensates depends on not only the inter-atomic-molecular nonlinear interactions and the initial number of atoms in these condensates,but also the tunneling coupling between the atomic condensate and the multi-atomic molecular *** is discovered that besides oscillating tunneling current between the atomic condensate and the multi-atomic molecular condensate,the nonlinear multi-atomic molecular tunneling dynamics sustains a self-locked population imbalance:a macroscopic quantum self-trapping *** influence of de-coherence caused by non-condensate atoms on the tunneling dynamics is *** is shown that de-coherence suppresses the multi-atomic molecular ***,the conception of the molecular Bose-Einstein condensate,which is different from the conventional single-atomic Bose-Einstein condensate,is specially emphasized in this paper.

关键词： tunneling dynamics an atomic(a molecular)Bose-Einstein condensate feshbach resonance decoherence

Spontaneous U(1) Symmetry Breaking in Coupled Bose System

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Communications in Theoretical Physics 2011年第6期55卷 997-1000页

作者：王影徐金荣陈理刘果红 Department of Mathematics and Physics Anhui University of Architecture Department of Physics Southeast University

Adding a U（1） symmetry breaking term √V（λ1a0 ＋ λ1＊a0）＋ √V（λ2b0 ＋ λ2＊b0） to Bogoliubov＇s truncated Hamiltonian HB for a weakly interacting coupled Bose system, by using the mean-field approximation rather than the c-number approximation, we And that, via a feshbach resonance at zero temperature, the states of the coupled Bose system are generalized SU（1,1） SU（1,1） coherent states. The Bose-Einstein condensation occurs in response to the spontaneous U（1） symmetry breaking.

关键词： BEC U(1) symmetry breaking generalized SU(1,1) SU(1,1) coherent state feshbach resonance

Radio-frequency spectroscopic measurement for pairing gap in an ultracold Fermi gas

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Science China Chemistry 2013年第3期56卷 581-587页

作者： JIANG KaiJun LUO Hua LI Kai ZHANG DongFang GAO TianYou PENG ShiGuo State Key Laboratory of Magnetic resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of Sciences Center for Cold Atom Physics Chinese Academy of Sciences

The study of ultracold Fermi gases has exploded a variety of experimental and theoretical research since the achievement of degenerate quantum gases in the lab,which expands the research range over atomic physics,condensed matter physics,astrophysics and particle *** the feshbach resonance,one can tune the attractive two-body interaction from weak to strong and thereby make a smooth crossover from the BCS superfluid of cooper pairs to the Bose Einstein condensate of bound *** this crossover regime,the pairing effect plays a significant role in interpreting the interaction *** the localized or delocalized pairing occurs at sufficiently low temperature,the single-particle energy will shift with respect to free atoms,due to the two-body or many-body *** the pairing gap can improve the understanding of the thermodynamics and hydrodynamics of the phase transition from the pseudogap to the superfluid,which will make an analogue to the high-temperature superconductivity in condensed *** this work,we will give a brief introduction to a novel radio-frequency(RF) spectroscopic measurement for pairing gap in an ultracold Fermi gas,which is currently widely used on the ultracold atomic table in the *** different interaction regimes of the BEC-BCS crossover,ultracold atoms are excited with a RF pulse and the characteristic behavior can be extracted from the spectrum.

关键词： degenerate Fermi gas feshbach resonance Bose Einstein condensate superfluid