Hamburg 2009 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster II

Q 30.1: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

Transport of Bogoliubov excitations in correlated disorder — Christopher Gaul, Nina Renner, and •Cord Axel Müller — Physikalisches Institut, Universität Bayreuth, Deutschland

We investigate the dynamics of an interacting BEC in presence of an external disorder potential by considering its Bogoliubov excitations. The effective disorder-averaged Bogoliubov dispersion relation is calculated via the self-energy of the impurity-scattering Hamiltonian derived recently in [1]. We find that the excitation life time is determined by elastic scattering events, whereas corrections to the speed of sound are due to virtual excitations by inelastic scattering and pair creation/annihilation processes. We explore a variety of regimes by varying the finite disorder correlation length as compared to the excitation wave-length and condensate healing length and confront our predictions with numerical simulations.

[1] Gaul and Müller, Europhys. Lett. 83, 10006 (2008)