Wednesday, March 20, 2013

1303.4339 (Luca Chirolli et al.)

Interactions in electronic Mach-Zehnder interferometers with
co-propagating edge channels

Luca Chirolli, Fabio Taddei, Rosario Fazio, Vittorio Giovannetti
We study Coulomb interactions in the finite bias response of Mach-Zehnder interferometers which exploit co-propagating 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 which 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, non-bounded or even diverging visibility of the differential conductance.
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