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题名: Extended Bose-Hubbard model on a honeycomb lattice
作者: Gan, Jing Yu ;  Wen, Yu Chuan ;  Ye, Jinwu ;  Li, Tao ;  Yang, Shi-Jie ;  Yu, Yue
刊名: PHYSICAL REVIEW B
出版日期: 2007
卷号: 75, 期号:21, 页码:-
关键词: OPTICAL LATTICES ;  QUANTUM GASES
学科分类: Physics
通讯作者: Gan, JY , Tsing Hua Univ, Ctr Adv Study, Beijing 100084, Peoples R China
部门归属: Tsing Hua Univ, Ctr Adv Study, Beijing 100084, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Chinese Acad Sci, Interdisciplinary Ctr Theoret Studies, Beijing 100080, Peoples R China; Penn State Univ, Dept Phys, University Pk, PA 16802 USA; Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China; Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China
英文摘要: We study the extended Bose-Hubbard model on a two-dimensional honeycomb lattice by using large-scale quantum Monte Carlo simulations. We present the ground-state phase diagrams for both the hard-core and the soft-core bosons. For the hard-core case, the transition between the rho=1/2 solid and the superfluid is first order, and the supersolid state is unstable toward phase separation. For the soft-core case, due to the presence of multiple occupation, a stable particle-induced supersolid (SS-p) phase emerges when 1/2 < 1. The transition from the solid at rho=1/2 to the SS-p phase is second order with the superfluid density scaling as rho(s)similar to rho-1/2. The SS-p phase has the same diagonal order as the solid at rho=1/2. As the chemical potential increases further, the SS-p phase turns into a solid where two bosons occupy each site of one sublattice through a first-order transition. We also calculate the critical exponents of the transition between the rho=1/2 solid and superfluid at the Heisenberg point for the hard-core case. We find the dynamical critical exponent z=0.15, which is smaller than results obtained on smaller lattices. This indicates that z approaches zero in the thermodynamic limit, and thus the transition is also first order even at the Heisenberg point.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000247624700094
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5720
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Gan, Jing Yu,Wen, Yu Chuan,Ye, Jinwu,et al. Extended Bose-Hubbard model on a honeycomb lattice[J]. PHYSICAL REVIEW B,2007,75(21):-.
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