具有偶极相互作用的二维均匀玻色子系统的基态性质
Ground state properties of a homogeneous 2D system of Bosons with dipolar interactions
摘要：
利用量子蒙特卡罗技术研究了具有偶极-偶极相互作用的二维玻色系统的基态相位特性。讨论了二维几何中平均场论的局限性。发现了从气体到固体的量子相变，并在相变附近检验了晶体中超固体的存在。在有限尺寸晶体中，非对角长程序的介观模拟存在于单体密度矩阵中。非零超流分数被发现在一个有限尺寸的晶体，信号显着增加的空位的存在。
英文摘要：
The ground-state phase properties of a two-dimensional Bose system with dipole-dipole interactions is studied by means of quantum Monte Carlo techniques. Limitations of mean-field theory in a two-dimensional geometry are discussed. A quantum phase transition from gas to solid is found. Crystal is tested for existence of a supersolid in the vicinity of the phase transition. Existence of mesoscopic analogue of the off-diagonal long-range order is shown in the one-body density matrix in a finite-size crystal. Non-zero superfluid fraction is found in a finite-size crystal, the signal being dramatically increased in presence of vacancies.
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