Quantum phases of Bose gases on a lattice with pair-tunneling

doi:10.1088/1674-1056/21/6/060305

中国物理B ›› 2012, Vol. 21 ›› Issue (6): 60305-060305.doi: 10.1088/1674-1056/21/6/060305

Quantum phases of Bose gases on a lattice with pair-tunneling

王月明, 梁九卿

Department of Physics, Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China

收稿日期:2012-02-12 修回日期:2012-03-21 出版日期:2012-05-01 发布日期:2012-05-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11075099, 10974124, and 11105087).

Quantum phases of Bose gases on a lattice with pair-tunneling

Wang Yue-Ming(王月明)^† and Liang Jiu-Qing(梁九卿)

Department of Physics, Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China

Received:2012-02-12 Revised:2012-03-21 Online:2012-05-01 Published:2012-05-01
Contact: Wang Yue-Ming E-mail:wang_ym@sxu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11075099, 10974124, and 11105087).

摘要/Abstract

摘要： We investigate the strongly interacting lattice Bose gases on a lattice with two-body interaction of nearest neighbors characterized by pair tunneling. The excitation spectrum and the depletion of the condensate of lattice Bose gases are investigated using the Bogoliubov transformation method and the results show that there is a pair condensate as well as a single particle condensate. The various possible quantum phases, such as the Mott-insulator phase (MI), the superfluid phase (SF) of an individual atom, the charge density wave phase (CDW), the supersolid phase (SS), the pair-superfluid (PSF) phase, and the pair-supersolid phase (PSS) are discussed in different parametric regions within our extended Bose-Hubbard model using perturbation theory.

关键词: Bose-Einstein condensate, quantum phase, optical lattice, superfluidity

Abstract: We investigate the strongly interacting lattice Bose gases on a lattice with two-body interaction of nearest neighbors characterized by pair tunneling. The excitation spectrum and the depletion of the condensate of lattice Bose gases are investigated using the Bogoliubov transformation method and the results show that there is a pair condensate as well as a single particle condensate. The various possible quantum phases, such as the Mott-insulator phase (MI), the superfluid phase (SF) of an individual atom, the charge density wave phase (CDW), the supersolid phase (SS), the pair-superfluid (PSF) phase, and the pair-supersolid phase (PSS) are discussed in different parametric regions within our extended Bose-Hubbard model using perturbation theory.

Key words: Bose-Einstein condensate, quantum phase, optical lattice, superfluidity

中图分类号: (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)

03.75.Lm

64.70.Tg (Quantum phase transitions) 67.85.Hj (Bose-Einstein condensates in optical potentials)

王月明, 梁九卿. Quantum phases of Bose gases on a lattice with pair-tunneling[J]. 中国物理B, 2012, 21(6): 60305-060305.

Wang Yue-Ming(王月明) and Liang Jiu-Qing(梁九卿) . Quantum phases of Bose gases on a lattice with pair-tunneling[J]. Chin. Phys. B, 2012, 21(6): 60305-060305.

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Quantum phases of Bose gases on a lattice with pair-tunneling

Quantum phases of Bose gases on a lattice with pair-tunneling

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