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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 |
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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.
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Received: 12 February 2012
Revised: 21 March 2012
Accepted manuscript online:
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PACS:
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03.75.Lm
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(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
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64.70.Tg
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(Quantum phase transitions)
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67.85.Hj
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(Bose-Einstein condensates in optical potentials)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11075099, 10974124, and 11105087). |
Corresponding Authors:
Wang Yue-Ming
E-mail: wang_ym@sxu.edu.cn
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Cite this article:
Wang Yue-Ming(王月明) and Liang Jiu-Qing(梁九卿) Quantum phases of Bose gases on a lattice with pair-tunneling 2012 Chin. Phys. B 21 060305
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