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BP: Fachverband Biologische Physik

BP 29: Biomolecular Spectroscopy

BP 29.5: Vortrag

Donnerstag, 25. März 2010, 15:30–15:45, H45

Motional effects on coherent exciton transport in a chain — •Markus Tiersch^1,2, Ali Asadian^1,2, Gian Giacomo Guerreschi^1,2, Jianming Cai^1,2, Sandu Popescu³, and Hans Briegel^1,2 — ¹Institut für Quantenoptik und Quanteninformation der Österreichischen Akademie der Wissenschaften, Innsbruck, Austria — ²Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria — ³H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom

In a reduced model of coherent excitation transport in α-helical polypeptides, individual amide units in a chain carry the excitation, and are coupled through dipol-dipol interactions. Vibrations of the chain cause a modulation of the distance dependent dipolar coupling between the individual sites, and thereby influence the transport efficiency through the chain. In this setting, we report on the motion-induced, effective locking and guiding of excitations, and investigate control mechanisms to enhance the transport through the chain.