Features in Evanescent Aharonov-Bohm interferometry

TL;DR

This paper investigates the behavior of an Aharonov-Bohm interferometer in the tunneling regime, revealing how quantum wells can revive current magnification and affect magneto-conductance oscillations and resonance lineshapes.

Contribution

It demonstrates that a quantum well in one arm of the interferometer can restore current magnification and Fano resonance features in the tunneling regime.

Findings

Current magnification is absent in the tunneling regime without modifications.

Introducing a quantum well revives current magnification effects.

Magneto-conductance oscillations show systematic behavior in evanescent wave geometry.

Abstract

In this work we analyze an Aharonov-Bohm interferometer in the tunneling regime. In this regime, current magnification effect which arises in presence of transport currents is absent. A slight modification in the form of a quantum well incorporated in one of the arms leads to revival of current magnification. Systematics in magneto-conductance oscillations are observed in this evanescent wave geometry. In this framework we also see absence of Fano lineshapes in transmission resonances but once again one can recover these if the direct path supports propagating modes.