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DY: Fachverband Dynamik und Statistische Physik

DY 6: Quantum Dynamics, Decoherence, and Quantum Information I

DY 6.2: Vortrag

Montag, 14. März 2011, 14:15–14:30, ZEU 255

Environment-assisted transport and trapping in networks — •Oliver Mülken — Physikalisches Institut, Universität Freiburg, Freiburg, Germany

We study the dynamics and trapping of excitations for a networks with disorder coupled to an external environment. Using a quantum master equation approach, we calculate the survival probability Π(t) of the excitation and define different lifetimes τs of the excitation, corresponding to the duration of the decay of Π(t) in between two predefined values. We show that it is not possible to always enhance the overall decay to the trap. However, it is possible, even for not too small environmental couplings, to decrease certain lifetimes, leading to faster decay of Π(t) in these time intervals: there is an optimal environmental coupling, leading to a maximal decay for fixed disorder strength.

[1] Phys. Rev. E 82, 042104 (2010)