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HL: Halbleiterphysik

HL 4: Ultrakurzzeitph
änomene

HL 4.9: Talk

Monday, March 8, 2004, 12:15–12:30, H13

Optically induced realspace-transfer between mesoscopic quantum dots — •Claus Metzner and Dominik Stehr — Technische Physik I, Universität Erlangen Nürnberg, Erwin-Rommel-Str. 1, 91052 Erlangen

We theoretically investigate a physical scenario in which packets of electrons (less than 100) are moving coherently over mesoscopic distances in a two-dimensional potential landscape, created by laterally selective doping of a quantum well. The motion of the charge packets is controlled and monitored in a purely optical way by using ultrashort light (or THz) pulses, acting as time-dependent electric driving forces. In the strong field regime, the interacting few-particle system shows a complex, nonlinear, collective dynamics, partially corrupted by stochastic phonon scattering events. Nevertheless, a controlled transfer between metastable states (corresponding to spatially separated potential minima, or meso-dots) can be achieved with proper light pulses. The pulse parameters can be found automatically by evolutionary optimization.