NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR, I-56127 Pisa, Italy.
Phys Rev Lett. 2013 Jul 19;111(3):036801. doi: 10.1103/PhysRevLett.111.036801. Epub 2013 Jul 17.
We study Coulomb interactions in the finite bias response of Mach-Zehnder interferometers, which exploit copropagating edge states in the integer quantum Hall effect. Here, interactions are particularly important since the coherent coupling of edge channels is due to a resonant mechanism that is spoiled by inelastic processes. We find that interactions yield a saturation, as a function of bias voltage, of the period-averaged interferometer current, which gives rise to unusual features, such as negative differential conductance, enhancement of the visibility of the current, and nonbounded or even diverging visibility of the differential conductance.
我们研究了马赫-曾德尔干涉仪在有限偏压响应中的库仑相互作用，该干涉仪利用整数量子霍尔效应中的共传播边缘态。在这里，相互作用尤为重要，因为边缘通道的相干耦合是由于一个共振机制，而这个机制会被非弹性过程破坏。我们发现，相互作用导致了周期平均干涉仪电流的饱和，这导致了一些不寻常的特征，如负微分电导、电流可见度的增强以及微分电导的无界或甚至发散可见度。
