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arXiv 1503.00534cond-mat.mes-hall
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电容耦合纳米导体:棘轮电流和交换涨落关系

Capacitively coupled nano conductors: Ratchet currents and exchange fluctuation relations

Robert Hussein, Sigmund Kohler

摘要:

研究了两个相互库仑作用的量子线路中的电子输运。第一个电路是一个双量子点连接到两个电子库,而第二个是一个量子点接触在弱隧穿极限。这种耦合使得第一电路中的电子增强了点接触的势垒,从而降低了其导电性。虽然这种设置经常被用作电荷监测器,但我们关注两个不同的方面。首先,我们推导出最近被用来测试广义均衡条件称为交换波动关系的传输系数。这些形式上的精确关系使我们能够测试我们的主方程方法的一致性。第二,偏置点接触会在DQD上产生噪声,并引起非平衡现象,如棘轮电流。

英文摘要:

We investigate electron transport in two quantum circuits with mutual Coulomb interaction. The first circuit is a double quantum dot connected to two electron reservoirs, while the second one is a quantum point contact in the weak tunneling limit. The coupling is such that an electron in the first circuit enhances the barrier of the point contact and, thus, reduces its conductivity. While such setups are frequently used as charge monitors, we focus on two different aspects. First, we derive transport coefficients which have recently been employed for testing generalized equilibrium conditions known as exchange fluctuation relations. These formally exact relations allows us to test the consistency of our master equation approach. Second, a biased point contact entails noise on the DQD and induces non-equilibrium phenomena such as a ratchet current.

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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