Two types of conductance minima in electrostatic Aharonov-Bohm conductance oscillations

Abstract

We predict the existence of two different types of conductance minima, arising from different interference conditions, in the conductance oscillation of a one-dimensional ring due to the electrostatic Aharonov-Bohm effect. The occurrence of two types of minima doubles the frequency of the conductance troughs in the oscillations, making it twice that predicted by the Aharonov-Bohm effect. This feature, which is not inhibited by elastic scattering in the weak-localization regime, can, however, be observed only at sufficiently low temperatures. At elevated temperatures, one of the two types of minima is bleached out and the normal Aharonov-Bohm frequency is restored.