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TT: Tiefe Temperaturen

TT 29: Transport: Quantum Coherence and Quantum Information Systems - Part 1

TT 29.10: Vortrag

Donnerstag, 30. März 2006, 12:15–12:30, HSZ 304

How does a spin decay? A novel time dependent numerical renormalization group approach — •Frithjof B Anders — Theoretische Physik, Universität des Saarlandes, Saarbrücken, Germany

In contrast to equilibrium conditions, the understanding of real-time evolution of many-particle quantum systems is still at its infancy. A novel approach to time dependent non-equilibrium quantum impurity systems based on the numerical renormalization group is presented [1]. As a first application, a spin coupled either a bosonic or a fermionic bath is considered. While the spin-boson model is often used in context of decoherence of qubits as well as for charge transfer reactions in chemistry, the latter describes spin- and charge-relaxation processes in ultra-small quantum dots. I will discuss how the environment governs the time scales of the spin decay in both cases. I will present an outlook to the application of our method to charge transfer dynamics in large functional bio-molecules as well as to DC-currents though ultra-small quantum dots.

[1] F. B. Anders and A. Schiller, Phys. Rev. Lett. 95, 196801 (2005)