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arXiv 0804.0545cond-mat.mes-hall
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开放量子点中库仑阻塞的数值研究

Numerical study of the Coulomb blockade in an open quantum dot

Yuji Hamamoto, Takeo Kato

摘要:

采用路径积分蒙特卡罗方法,数值研究了单模点接触连接的开放量子点中的库仑阻塞。研究了量子点的平均电荷和电容的库仑振荡,并与强隧穿时的解析表达式进行了比较。在简并点,我们观察到对数发散的电容在点接触的强背散射。这一观察结果支持了这样的猜想,即本系统在简并点的性质是由两通道近藤问题描述的任意强度的隧穿。

英文摘要:

The Coulomb blockade in an open quantum dot connected to a bulk lead by a single mode point contact is studied numerically using the path-integral Monte Carlo method. The Coulomb oscillation of the average charge and capacitance of the dot is investigated, and is compared with the analytic expression for strong tunneling. At the degeneracy point, we observe logarithmic divergence of the capacitance for strong backscattering at the point contact. This observation supports the conjecture that the nature of the present system at the degeneracy point is described by the two-channel Kondo problem for an arbitrary strength of tunneling.

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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