Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.53: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Multiple scattering of interacting bosons in random potentials — Tobias Geiger, •Thomas Wellens, and Andreas Buchleitner — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Germnay

We microscopically derive a theory for scattering of N atoms – with all atoms initially prepared in the same single-particle momentum eigenstate – from a three dimensional random disorder potential in the presence of two-body interactions. Starting from an exact diagrammatic expansion of the N-particle transition amplitude, we identify those combinations of diagrams which – in the case of a weak random potential (mean free path much larger than wavelength) – survive the disorder average, and sum up the remaining series of ladder and crossed diagrams non-perturbatively in the strength of the particle-particle interaction. We show that the latter leads to a relaxation of the individual particles’ energies towards a Maxwell-Boltzmann distribution as the particles diffuse throughout the random potential [1]. As interferential correction to diffusive transport, we furthermore consider the phenomenon of coherent backscattering and analyze how this coherent effect is modified by interactions.

[1] T. Geiger, T. Wellens, and A. Buchleitner, Phys. Rev. Lett. 109, 030601 (2012)