Nonequilibrium charge dynamics of light-driven rings threaded by a magnetic flux

TL;DR

This paper investigates how short electromagnetic pulses and magnetic flux influence charge polarization and currents in mesoscopic rings, revealing controllable light emission and methods to manipulate persistent currents.

Contribution

It introduces a theoretical framework for controlling charge dynamics in mesoscopic rings using electromagnetic pulses and magnetic flux, highlighting new ways to manipulate persistent currents.

Findings

Charge polarization and light emission are tunable via magnetic flux.

Perpendicular pulses can induce and control charge currents.

Conditions to halt persistent currents with pulses are identified.

Abstract

We study theoretically the charge polarization and the charge current dynamics of a mesoscopic ring driven by short asymmetric electromagnetic pulses and threaded by an external static magnetic flux. It is shown that the pulse-induced charge polarization and the associated light-emission is controllable by tuning the external magnetic flux. Applying two mutually perpendicular pulses triggers a charge current in the ring. The interplay between this nonequilibrium and the persistent currents is investigated and the conditions under which the pulses stop the persistent current are identified.