Periodic giant persistent current in sharp pulses on a ring

We show here a mesoscopic device based on a narrow ring containing an electron. In the device, an amount of energy is stored in advance. Similar to a pendulum, an exact periodic motion of the electron is thereby initiated. The motion appears as a series of sharp pulses and is in nature different from the well-known Aharonov-Bohm (A-B) oscillation. In particular, the current pulses can be tuned to be very strong (say, more than two orders of magnitude stronger than the usual A-B current). Related theory and numerical results are presented.