Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 9: Poster I

HL 9.69: Poster

Montag, 27. März 2006, 15:15–17:45, P3

Persistent vs. photoinduced currents in semiconductor mesoscopic rings. — •A. Matos-Abiague, A. S. Moskalenko, and J. Berakdar — Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany.

The dynamics of semiconductor mesoscopic rings driven by ultrashort electromagnetic pulses is theoretically investigated. It is shown that by subjecting the ring to a sequence of shaped pulses a charge current can be generated in the ring in absence of any external magnetic field. The dependence of the photoinduced currents (and the associated magnetization of the ring) on the electromagnetic field parameters is studied in details. We also demonstrate that predefined magnetic states of an array of rings can be optically generated and manipulated. Furthermore, when the ring is pierced by a magnetic flux there exist persistent currents that are dynamically modified by the action of the pulses. The influence of the electromagnetic field on the persistent current as well as its coexistence and competition with the photoinduced current are discussed.