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arXiv 0902.4816cond-mat.str-el
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量子点三聚体中的量子相变

Quantum phase transition in quantum dot trimers

Andrew K. Mitchell, Thomas F. Jarrold, David E. Logan

摘要:

我们研究了一个系统的三个隧道耦合半导体量子点在一个三角形的几何形状,其中之一是连接到一个金属铅,在该制度中,每个点基本上是单独占用。铁磁和反铁磁自旋1/2近藤制度,分离的量子相变,出现在调谐的interdot隧道耦合,应该是实验访问。即使在铁磁耦合局域磁矩相,在有限温度下,近藤效应也出现在相变附近。物理参数和数值重整化群技术被用来获得一个详细的了解的问题。

英文摘要:

We investigate a system of three tunnel-coupled semiconductor quantum dots in a triangular geometry, one of which is connected to a metallic lead, in the regime where each dot is essentially singly occupied. Both ferro- and antiferromagnetic spin-1/2 Kondo regimes, separated by a quantum phase transition, are shown to arise on tuning the interdot tunnel couplings and should be accessible experimentally. Even in the ferromagnetically-coupled local moment phase, the Kondo effect emerges in the vicinity of the transition at finite temperatures. Physical arguments and numerical renormalization group techniques are used to obtain a detailed understanding of the problem.

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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