二维偶极晶体的准平衡超固相
Quasiequilibrium supersolid phase of a two-dimensional dipolar crystal
摘要：
用量子蒙特卡罗方法研究了零温下二维偶极晶体超固相存在的可能性。结果表明，在热力学极限下，公度固体不是超固体。空位或杂质的存在使固体变成超固相，即使它们中的一小部分存在于宏观系统中。空位之间的有效相互作用是排斥的，使得准平衡偶极超固体成为可能。
英文摘要：
We have studied the possible existence of a supersolid phase of a two-dimensional dipolar crystal using quantum Monte Carlo methods at zero temperature. Our results show that the commensurate solid is not a supersolid in the thermodynamic limit. The presence of vacancies or interstitials turns the solid into a supersolid phase even when a tiny fraction of them are present in a macroscopic system. The effective interaction between vacancies is repulsive making a quasiequilibrium dipolar supersolid possible.
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