Three-body interactions on a triangular lattice

Three-body interactions on a triangular lattice
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三角晶格上的三体相互作用

DOI:
10.1103/physrevb.83.184513
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发表时间:
2011-01
期刊:
影响因子:
3.7
通讯作者:
--
中科院分区:
物理与天体物理2区
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--
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我们分析了三角形晶格上同时具有三体排斥和最近邻排斥的硬核Bose-Hubbard模型。相图由半经典近似和量子蒙特卡罗模拟得到。对于只有三体相互作用的体系,超固体相和三分之一的固体都消失了,而三分之二的固体是稳定的。作为最近邻排斥玻色子的热行为,固体和超流体分别经历了三态Potts和Kosterlitz-Thouless相变。在一个同时存在受挫的最近邻二体和三体相互作用的系统中,超固体和三分之一的固体被复活。通过调节三体相互作用的强度,相图被扭曲,因为三分之一的固体和超固体被抑制。
We analyze the hard-core Bose-Hubbard model with both three-body and nearest-neighbor repulsions on a triangular lattice. The phase diagram is achieved by means of the semiclassical approximation and a quantum Monte Carlo simulation. For a system with only three-body interactions, both the supersolid phase and the one-third solid disappear while the two-thirds solid is stable. As the thermal behavior of the bosons with nearest-neighbor repulsion, the solid and the superfluid undergo the three-state Potts-and Kosterlitz-Thouless-type phase transitions, respectively. In a system with both frustrated nearest-neighbor two-body and three-body interactions, the supersolid and one-third solid are revived. By tuning the strength of the three-body interactions, the phase diagram is distorted because the one-third solid and the supersolid are suppressed.
DOI: 10.1103/physrevb.83.134511
发表时间: 2011-01
期刊: Physical Review B
影响因子: 3.7
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