Volume 78, Number 5, June 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 May 2007|
Nonequilibrium charge dynamics of light-driven rings threaded by a magnetic flux
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
Accepted: 13 April 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.
PACS: 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
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