Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 17: Postersitzung II: Transport, Quantenkoh
ärenz, Quantenflüssigkeiten

TT 17.19: Poster

Dienstag, 9. März 2004, 14:30–19:00, Poster A

Periodically controlled qubit system coupled to an environment — •Marcus Stollsteimer und Günter Mahler — Universität Stuttgart, Institut für Theoretische Physik 1, Pfaffenwaldring 57, D-70550 Stuttgart

We study the Schrödinger dynamics of a small system of coupled spin-1/2 particles (qubits) which is subject to periodic external parameter control (Floquet-type system). This system proper is coupled to another quantum system that acts as environment or ”bath” (no bath approximations are made).

When the control is switched off, the system relaxes into an equilibrium state (except for finite size effects); for non-zero control the system reaches a different ”quasi-equilibrium” state. We are interested on properties of this new equilibrium state, and how they can be manipulated by the external control.