Regensburg 2007 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Synchronization
DY 32.1: Vortrag
Freitag, 30. März 2007, 10:15–10:30, H3
Quantum Stochastic Synchronization — •I. Goychuk1, J. Casado-Pascual2, M. Morillo2, J. Lehmann3, and P. Hanggi1 — 1Universität Augsburg, Germany — 2Universidad de Sevilla, Spain — 3Universität Basel, Switzerland
We study, within the spin-boson dynamics, the synchronization of a quantum
tunneling system with an external, time-periodic driving signal [1].
As a main result
we find that at a sufficiently large system-bath coupling strength
(i.e. for a friction strength α>1) the thermal noise plays a constructive
role in yielding forced synchronization.
This noise-induced synchronization can occur when
the driving frequency is larger than the zero-temperature tunneling rate.
As an application evidencing the effect, we consider the charge transfer
dynamics in molecular complexes.
[1] I. Goychuk, J. Casado-Pascual, M. Morillo,
J. Lehmann, P. Hänggi, Phys. Rev. Lett. 97, 210601 (2006).