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DY: Fachverband Dynamik und Statistische Physik

DY 8: Quantum Dynamics, Decoherence, and Quantum Information I

DY 8.2: Vortrag

Dienstag, 23. März 2010, 10:15–10:30, H38

Dissipative Excitonic Dynamics with Trapping — •Oliver Mülken, Tobias Schmid, Alexander Blumen, and Lothar Mühlbacher — Institut für Physik, Universität Freiburg, Freiburg, Germany

The trapping of excitations in systems coupled to an environment allows to study the quantum to classical crossover by different means. We show how to combine the phenomenological description by a non-hermitian Liouville-von Neumann Equation (LvNE) approach in the Lindblad form to the numerically exact Path Integral Monte-Carlo (PIMC) method, and examplify our results by considering coupled two-level systems. By varying the coupling strenght to the environment we are able to estimate the parameter range in which the LvNE approach yields satisfactory results. Moreover, by matching the PIMC results with the LvNE calculations we have a powerful tool to extrapolate the numerically exact PIMC method to long times.

References:

[1] Mülken et al., Phys. Rev. Lett 99, 090601 (2007).

[2] Mülken, Schmid, Blumen, and Mühlbacher, submitted (2009).

[3] Mülken and Mühlbacher, in preparation (2009)