Mesoscopic dipolar quantum crystals
Mesoscopic dipolar quantum crystals
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介观偶极量子晶体
DOI：
10.1103/physreva.87.063604
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发表时间：
2013
影响因子：
2.9
通讯作者：
M. Boninsegni
中科院分区：
文献类型：
--
作者：
M. Boninsegni
本文通过计算机模拟研究了由30个极性分子组成的二维、谐波约束介观组装体的基态。随着束缚阱强度的增加，团簇由超流体、超固体、绝缘晶体演变而来。对于强约束，晶体结构可以基于经典能量学进行预测。然而，特定数量的粒子簇（即N=12和N=19）显示出一种由量子效应稳定的{\it非经典晶体结构}，在中等范围的约束强度内。在这些情况下，在有限温度下观察到量子和经典晶体构型的共存。
The ground state of a two-dimensional, harmonically confined mesoscopic assembly of up to thirty polar molecules is studied by computer simulations. As the strength of the confining trap is increased, clusters evolve from superfluid, to supersolid, to insulating crystals. For strong confinement, the crystalline structure can be predicted based on classical energetics. However, clusters of specific numbers of particles (i.e., N=12 and N=19) display a {\it non-classical crystalline structure}, stabilized by quantum effects, in an intermediate range of confinement strength. In these cases, coexistence of quantum and classical crystalline configurations is observed at finite temperature.