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.