Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Phys Rev Lett. 2009 Nov 13;103(20):206806. doi: 10.1103/PhysRevLett.103.206806.
We investigate nonlinear transport in electronic Fabry-Pérot interferometers in the integer quantum Hall regime. For interferometers sufficiently large that Coulomb blockade effects are absent, a checkerboardlike pattern of conductance oscillations as a function of dc bias and perpendicular magnetic field is observed. Edge-state velocities extracted from the checkerboard data are compared to model calculations and found to be consistent with a crossover from skipping orbits at low fields to E-vector x B-vector drift at high fields. Suppression of visibility as a function of bias and magnetic field is accounted for by including energy- and field-dependent dephasing of edge electrons.
我们研究了整数量子 Hall 区中电子 Fabry-Pérot 干涉仪中的非线性输运。对于不存在库仑阻塞效应的足够大的干涉仪，观察到作为直流偏压和垂直磁场函数的电导振荡的棋盘状图案。从棋盘数据中提取的边缘态速度与模型计算进行了比较，结果表明，从低场的跳跃轨道到高场的 E-vector x B-vector 漂移发生了交叉。通过包括边缘电子的能量和场相关退相，来解释作为偏压和磁场函数的可见度的抑制。
