PERSISTENT CURRENT IN A ONE-DIMENSIONAL RING INDUCED BY AN ELECTROMAGNETIC POTENTIAL

In this paper, we study the persistent current in a normal conductor r ing coupled to a reservoir with an ideal lead and investigate the effe ct of an electromagnetic potential on free electrons in a normal-condu ctor one-dimensional ring. The electrostatic potential on the ring mod ulates the amplitude, phase and frequency of the Aharonov-Bohm flux cu rrent. We discuss the effect of reflection on both sides of the gate e lectrode on the persistent current in the presence of an electromagnet ic potential. The oscillation amplitude of the persistent current and the density of states decrease as the electrostatic potential increase s at constant magnetic flux.