Two peaks in the momentum distribution of bosons in a weakly frustrated two-leg optical ladder

被引：24
|
作者：
Cha, Min-Chul [1 ]
Shin, Jong-Geun [1 ]
机构：
[1] Hanyang Univ, Dept Appl Phys, Ansan 426791, South Korea
来源：
PHYSICAL REVIEW A | 2011年 / 83卷 / 05期
关键词：
MAGNETIC-FIELDS; MOTT INSULATOR; ATOMS; TRANSITION; SUPERFLUID; LATTICES; GAS;
D O I：
10.1103/PhysRevA.83.055602
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The ground-state properties of neutral hard-core bosons trapped in an optical two-leg ladder in the presence of an artificial magnetic field are studied. For a weak field, two separated peaks appear in the momentum distribution as a signature of the Meissner state in which bosons, carrying persistent currents on each leg, condense into finite-momentum states, while for a strong field, a central peak and tiny bumps associated with the vortex lattice structure indicate that the ground state is the vortex state.
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页数：4
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