Reentrant quantum phase transition in double-well optical lattices

被引：15
作者：
Danshita, Ippei [1 ,2 ,3 ]
de Melo, Carlos A. R. Sa [1 ,2 ]
Clark, Charles W. [1 ,2 ,4 ]
机构：
[1] Natl Inst Stand & Technol, Joint Quantum Inst, Gaithersburg, MD 20899 USA
[2] Univ Maryland, Gaithersburg, MD 20899 USA
[3] Waseda Univ, Dept Phys, Shinjuku Ku, Tokyo 1698555, Japan
[4] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
来源：
PHYSICAL REVIEW A | 2008年 / 77卷 / 06期
关键词：
D O I：
10.1103/PhysRevA.77.063609
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We study the quantum phases of bosons confined to a combined potential of a one-dimensional double-well optical lattice and a parabolic trap (two-legged ladders). We apply the time-evolving block decimation method to the corresponding ladders described by a two-legged Bose-Hubbard model. In the absence of a parabolic trap, the system of bosons in the double-well optical lattice exhibits a reentrant quantum phase transition between Mott insulator and superfluid phases at unit filling as the tilt of the double wells is increased. We show that this reentrant phase transition still occurs in the presence of a parabolic trap, and we suggest that it can be detected experimentally by measuring matter-wave interference patterns.
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页数：5
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