Ermann L, Chepelianskii A D, Shepelyansky D L
Departamento de Física Teórica, GIyA, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Feb;87(2):022912. doi: 10.1103/PhysRevE.87.022912. Epub 2013 Feb 21.
We study the microwave induced ratchet transport of two-dimensional electrons on an oriented semidisk Galton board. The magnetic field symmetries of ratchet transport are analyzed in the presence of electron-electron interactions. Our results show that a magnetic field asymmetric ratchet current can appear due to two contributions, a Hall drift of the rectified current that depends only weakly on electron-electron interactions and a breaking of the time reversal symmetry due to the combined effects of interactions and magnetic field. In the latter case, the asymmetry between positive and negative magnetic fields vanishes in the weak interaction limit. We also discuss the recent experimental results on ratchet transport in asymmetric nanostructures.
我们研究了在定向半圆形高尔顿板上二维电子的微波诱导棘轮输运。在存在电子 - 电子相互作用的情况下，分析了棘轮输运的磁场对称性。我们的结果表明，由于两种贡献，可能会出现磁场不对称的棘轮电流：一种是整流电流的霍尔漂移，它仅微弱地依赖于电子 - 电子相互作用；另一种是由于相互作用和磁场的综合效应导致的时间反演对称性破缺。在后一种情况下，正负磁场之间的不对称性在弱相互作用极限中消失。我们还讨论了最近关于非对称纳米结构中棘轮输运的实验结果。
