Features in evanescent Aharonov-Bohm interferometry

Abstract

In this work we analyze an Aharonov-Bohm interferometer in the tunneling regime. In this regime, a 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 the revival of the current magnification. Systematics in magnetoconductance oscillations are observed in this evanescent wave geometry. In this framework we also see absence of Fano line shapes in transmission resonances but once again one can recover these if the direct path supports propagating modes.