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HL: Halbleiterphysik

HL 24: Ultra fast phenomena

HL 24.2: Talk

Tuesday, March 28, 2006, 15:30–15:45, POT 151

Decay of non-equilibrium states created by half-cycle pulses in mesoscopic semiconductor rings — •Andrey Moskalenko, Alex Matos-Abiague, and Jamal Berakdar — Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany

Picosecond half-cycle electromagnetic pulses can be utilized for the ultrafast generation of non-equilibrium states in mesoscopic semiconductor rings [1,2,3]. We investigate the relaxation processes of these states towards equilibrium using the density matrix formalism. We show that for low temperatures and clean rings the characteristic relaxation times can be much longer than the pulse duration and long enough to observe the characteristic properties of the non-equilibrium states.

[1] A. Matos-Abiague, J. Berakdar, Phys. Rev. B 70, 195338 (2004).

[2] A. Matos-Abiague, J. Berakdar, Europhys. Lett. 69, 277 (2005).

[3] A. Matos-Abiague, J. Berakdar, Phys. Rev. Lett. 94, 166801 (2005).