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DY: Fachverband Dynamik und Statistische Physik

DY 4: Quantum Dynamics, Decoherence, and Quantum Information

DY 4.8: Vortrag

Montag, 26. März 2012, 17:00–17:15, MA 001

Noise-induced Förster Resonant Energy Transfer between orthogonal dipoles — •Peter Nalbach¹, Igor Pugliesi², and Michael Thorwart¹ — ¹I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg, Germany — ²II. Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität München, Oettingenstraße 67, 80538 Munich, Germany

We show that Förster resonance energy transfer (FRET) in an orthogonally arranged donor-acceptor pair can be induced by environmental noise although direct transfer is prohibited. Environmental fluctuations break the strict orthogonal arrangement of the dipoles and cause effective fluctuating excitonic interactions. Using a scaling argument, we show that interaction fluctuations are coupled to those of the energy levels and are strong enough to induce large FRET rates. This mechanism also explains their temperature dependence observed in a recent experiment on a perylene bisimide dyad and predicts a modified distance dependence as compared to standard Förster theory.