Volume 78, Number 5, June 2007
Article Number 57001
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 11 May 2007
EPL, 78 (2007) 57001
DOI: 10.1209/0295-5075/78/57001

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

A. S. Moskalenko1, 2, A. Matos-Abiague3 and J. Berakdar2

1  Max-Planck-Institut für Mikrostrukturphysik - Weinberg 2, 06120 Halle, Germany
2  Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Nanotechnikum-Weinberg, Heinrich-Damerow-St. 4, 06120 Halle, Germany
3  Institute for Theoretical Physics,University of Regensburg - 93040 Regensburg, Germany

received 16 January 2007; accepted in final form 13 April 2007; published June 2007
published online 11 May 2007

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.

73.23.-b - Electronic transport in mesoscopic systems.
73.23.Ra - Persistent currents.
42.65.Re - Ultrafast processes; optical pulse generation and pulse compression.

© Europhysics Letters Association 2007