量子涨落在冷极性分子六角相中的作用
The Role of Quantum Fluctuations in the Hexatic Phase of Cold Polar Molecules
摘要：
二维晶体通过中间\textit{hexatic}相熔化，其特征在于空间和取向关联函数的异常标度以及位错之间不存在吸引力。我们提出了一个协议来研究这个阶段的性质与系统的强相关的极性分子的热和量子波动的数量级相同的参数制度的量子波动的作用。实验中，位错可以通过引起位错分子内部斯塔克位移的局部能量差来定位。我们提出了一个从拓扑缺陷弦端点的统计量来判别六角相的判据，并在晶体相和超流相之间找到了一个由量子涨落控制的六角相.
英文摘要：
Two dimensional crystals melt via an intermediate \textit{hexatic} phase which is characterized by an anomalous scaling of spatial and orientational correlation functions and the absence of an attraction between dislocations. We propose a protocol to study the role of quantum fluctuations on the nature of this phase with a system of strongly correlated polar molecules in a parameter regime where thermal and quantum fluctuations are of the same order of magnitude. The dislocations can be located in experiment from local energy differences which induce internal stark shifts in dislocation molecules. We present a criterium to identify the hexatic phase from the statistics of the end points of topological defect strings and find a hexatic phase, which is dominated by quantum fluctuations, between crystal and superfluid phase.
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