Magnetic-field asymmetry of nonlinear mesoscopic transport -: art. no. 106802
Magnetic-field asymmetry of nonlinear mesoscopic transport -: art. no. 106802
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DOI：
10.1103/physrevlett.93.106802
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发表时间：
2004-09-03
影响因子：
8.6
通讯作者：
Büttiker, M
中科院分区：
文献类型：
--
作者：
Sánchez, D;Büttiker, M
我们调查偏离的Onsager关系的非线性制度的电子输运通过介观系统。我们表明，非线性电流-电压特性是不是一个均匀的磁场的函数，由于只在导体内的屏蔽电位的磁场依赖性。我们说明了这一结果的两种类型的导体：量子霍尔酒吧与antidot和混沌腔连接到量子点接触。对于混沌腔，我们得到通过随机矩阵理论的非线性电导的波动，迅速消失的接触的大小的不对称性。
We investigate departures of the Onsager relations in the nonlinear regime of electronic transport through mesoscopic systems. We show that the nonlinear current-voltage characteristic is not an even function of the magnetic field due only to the magnetic-field dependence of the screening potential within the conductor. We illustrate this result for two types of conductors: A quantum Hall bar with an antidot and a chaotic cavity connected to quantum point contacts. For the chaotic cavity we obtain through random matrix theory an asymmetry in the fluctuations of the nonlinear conductance that vanishes rapidly with the size of the contacts.