中国物理B ›› 2021, Vol. 30 ›› Issue (2): 26701-0.doi: 10.1088/1674-1056/abd760

所属专题： SPECIAL TOPIC — Quantum computation and quantum simulation

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  • 收稿日期:2020-10-25 修回日期:2020-11-25 接受日期:2020-12-30 出版日期:2021-01-18 发布日期:2021-01-26

Cluster mean-field study of spinor Bose-Hubbard ladder: Ground-state phase diagram and many-body population dynamics

Li Zhang(张莉)1,2, Wenjie Liu(柳文洁)1,2, Jiahao Huang(黄嘉豪)1,2,†, and Chaohong Lee(李朝红)1,2,‡   

  1. 1 Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing & School of Physics and Astronomy, Sun Yat-Sen University (Zhuhai Campus), Zhuhai 519082, China; 2 State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University (Guangzhou Campus), Guangzhou 510275, China
  • Received:2020-10-25 Revised:2020-11-25 Accepted:2020-12-30 Online:2021-01-18 Published:2021-01-26
  • Contact: †Corresponding author. E-mail: hjiahao@mail2.sysu.edu.cn ‡Corresponding author. E-mail: lichaoh2@mail.sysu.edu.cn
  • Supported by:
    Project supported by the Key-Area Research and Development Program of GuangDong Province, China (Grant No. 2019B030330001), the National Natural Science Foundation of China (Grant Nos. 11874434 and 11574405), the Science and Technology Program of Guangzhou, China (Grant No. 201904020024), and the Guangzhou Science and Technology Projects (Grant No. 202002030459).

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Abstract: We present a cluster mean-field study for ground-state phase diagram and many-body dynamics of spin-1 bosons confined in a two-chain Bose-Hubbard ladder (BHL). For unbiased BHL, we find superfluid (SF) phase and integer filling Mott insulator (IntMI) phase. For biased BHL, in addition to the SF and IntMI phases, there appears half-integer filling Mott insulator (HIntMI) phase. The phase transition between the SF and IntMI phases can be first order at a part of phase boundaries, while the phase transition between the SF and HIntMI phases is always second order. By tuning the bias energy, we report on the change of the nature of SF-MI phase transitions. Furthermore, we study the effect of the spin-dependent interaction on the many-body population dynamics. The spin-dependent interaction can lead to rich dynamical behaviors, but does not influence the particle transfer efficiency. Our results indicate a way to tune the nature of the SF-MI phase transition and open a new avenue to study the many-body dynamics of spinor bosons in optical lattices.

Key words: spinor Bose gases, superfluid-Mott insulator phase transition, Landau-Zener dynamics

中图分类号:  (Multicomponent condensates; spinor condensates)

  • 67.85.Fg
37.10.Jk (Atoms in optical lattices) 05.30.Rt (Quantum phase transitions) 67.85.Hj (Bose-Einstein condensates in optical potentials)