Role of confinements on the melting of Wigner molecules in quantum dots
Role of confinements on the melting of Wigner molecules in quantum dots
复制标题
量子点中限制对维格纳分子熔化的作用
DOI:
10.1140/epjb/e2016-60448-5
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
M. Bonitz
中科院分区:
文献类型:
--
作者:
D. Bhattacharya;A.V. Filinov;Amit Ghosal;M. Bonitz
We explore the stability of a Wigner molecule (WM) formed in confinements with different geometries emulating the role of disorder and analyze the melting (or crossover) of such a system. Building on a recent calculation [D. Bhattacharya, A. Ghosal, Eur. Phys. J. B86, 499 (2013)] that discussed the effects of irregularities on the thermal crossover in classical systems, we expand our studies in the untested territory by including both the effects ofquantum fluctuationsand ofdisorder. Our results, using classical and quantum (path integral) Monte Carlo techniques, 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 scalenX. 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 analyses carry serious implications for a variety of experiments on many-particle systems − semiconductor heterostructure quantum dots, trapped ions, nanoclusters, colloids and complex plasma.
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DOI:
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发表时间:
2013
期刊:
影响因子:
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作者:
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影响因子:
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