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arXiv 1004.4052cond-mat.mes-hall
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通过开放量子线的旋转门泵

Turnstile pumping through an open quantum wire

Cosmin Mihai Gainar, Valeriu Moldoveanu, Andrei Manolescu, Vidar Gudmundsson

摘要:

我们使用一个非马尔可夫广义主方程(GME)来描述通过耦合到半无限准二维导线的有限长度的抛物约束量子线的含时电荷转移。量子线和引线处于垂直的外部磁场中。左引线和右引线的接触取决于时间,并且保持异相以模拟有限尺寸的量子旋转门。的旋转门的驱动周期,外部磁场,字符的接触,和化学势偏置上的旋转门的电荷转移的有效性的影响进行检查,无论是在存在和不存在的磁场。还讨论了耦合强度和磁场强度之间的相互作用。我们观察如何在磁场的存在下产生的边缘状态有助于泵浦电荷。

英文摘要:

We use a non-Markovian generalized master equation (GME) to describe the time-dependent charge transfer through a parabolically confined quantum wire of a finite length coupled to semi-infinite quasi two-dimensional leads. The quantum wire and the leads are in a perpendicular external magnetic field. The contacts to the left and right leads depend on time and are kept out of phase to model a quantum turnstile of finite size. The effects of the driving period of the turnstile, the external magnetic field, the character of the contacts, and the chemical potential bias on the effectiveness of the charge transfer of the turnstile are examined, both in the absence and in the presence of the magnetic field. The interplay between the strength of the coupling and the strength of the magnetic field is also discussed. We observe how the edge states created in the presence of the magnetic field contribute to the pumped charge.

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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