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arXiv 1105.4075cond-mat.quant-gas
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阱中偶极介观超固体

Mesoscopic supersolid of dipoles in a trap

A. E. Golomedov, G. E. Astrakharchik, Yu. E. Lozovik

摘要:

本文研究了一个被简谐势囚禁的间接偶极玻色子介观系统。该系统具有许多物理实现,包括偶极激子、大偶极矩原子、极性分子、非均匀电场中的里德伯原子等。我们进行了扩散蒙特卡罗模拟,以确定在零温度下的二维被困偶极子系统的量子特性。在无量纲单位的系统描述的两个控制参数,即粒子的数量和粒子间相互作用的强度。我们已经证明,当粒子间的相互作用足够强时,就会形成介观晶体。随着相互作用强度的降低,发生多阶段熔融。使用自然轨道分析测试了系统中的非对角阶。我们发现,即使在强相互作用的情况下,系统也可能是玻色凝聚的。存在一组参数,对于这些参数,形成空间有序结构,同时玻色凝聚粒子的分数不为零。这可能被认为是介观超固体的实现。

英文摘要:

A mesoscopic system of indirect dipolar bosons trapped by a harmonic potential is considered. The system has a number of physical realizations including dipole excitons, atoms with large dipolar moment, polar molecules, Rydberg atoms in inhomogenious electric field. We carry out a diffusion Monte Carlo simulation to define the quantum properties of a two-dimensional system of trapped dipoles at zero temperature. In dimensionless units the system is described by two control parameters, namely the number of particles and the strength of the interparticle interaction. We have shown that when the interparticle interaction is strong enough a mesoscopic crystal is formed. As the strength of interactions is decreased a multi-stage melting takes place. Off-diagonal order in the system is tested using natural orbitals analysis. We have found that the system might be Bose-condensed even in the case of strong interparticle interactions. There is a set of parameters for which a spatially ordered structure is formed while simultaneously the fraction of Bose condensed particles is non zero. This might be considered as a realization of a mesoscopic supersolid.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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