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arXiv 1505.04044cond-mat.mes-hallcond-mat.dis-nncond-mat.str-el
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量子点中禁闭性质对Wigner分子熔化的影响

Influence of the nature of confinement on the melting of Wigner molecules in quantum dots

Dyuti Bhattacharya, A. V. Filinov, Amit Ghosal, M. Bonitz

摘要:

我们分析了具有不同对称性的受限几何中二维维格纳分子的量子熔化,并与相应的热熔化进行了比较。我们的研究结果揭示了互补机制,驱动量子和热交叉在WM和显示,限制的对称性在确定量子交叉规模$n_X$没有显着的作用。这是因为零点运动屏蔽了短距离内的边界效应。相图作为一个功能的热和量子波动确定独立的标准是唯一的,并显示“熔化”从WM的经典和量子“液体。“在极端量子状态下发现了一个有趣的信号,即随着温度的升高流动性减弱,$T$。交叉与缺陷的产生有关。然而,这些缺陷似乎在驱动量子和热“熔化”方面发挥着不同的作用。“我们的研究将有助于理解各种实验陷阱中的熔化-从量子点到复杂的等离子体。

英文摘要:

We analyze the quantum melting of two-dimensional Wigner molecules (WM) in confined geometries with distinct symmetries and compare it with corresponding thermal melting. Our findings unfold complementary mechanisms that drive the quantum and thermal crossovers in a WM and show that the symmetry of the confinement plays no significant role in determining the quantum crossover scale $n_X$. This is because the zero-point motion screens the boundary effects within short distances. The phase diagram as a function of thermal and quantum fluctuations determined from independent criteria is unique, and shows "melting" from the WM to both the classical and quantum "liquids." An intriguing signature of weakening liquidity with increasing temperature, $T$, is found in the extreme quantum regime. The crossover is associated with production of defects. However, these defects appear to play distinct roles in driving the quantum and thermal "melting." Our study will help comprehending melting in a variety of experimental traps - from quantum dots to complex plasma.

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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