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P: Fachverband Plasmaphysik

P 18: Poster: Theorie/Simulation dichter und stark gekoppelter Plasmen

P 18.6: Poster

Mittwoch, 30. März 2011, 16:30–18:30, Foyer

Crystallization of an exciton superfluid — Jens Böning, •Alexei Filinov, and Michael Bonitz — Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität, Leibnizstr. 15, D-24098 Kiel, Germany

Indirect excitons – pairs of electrons and holes spatially separated in semiconductor bilayers or quantum wells – are known to undergo Bose-Einstein condensation and to form a quantum fluid. Here we show that this superfluid may crystallize upon compression. However, further compression results in quantum melting back to a superfluid. This unusual behavior is explained by the effective interaction potential between indirect excitons which strongly deviates from a dipole potential at small distances due to many-particle and quantum effects [1]. Based on first principle path integral Monte Carlo simulations, we compute the complete phase diagram of this system and predict the relevant parameters necessary to experimentally observe exciton crystallization in semiconductor quantum wells.

[1] A Filinov, P Ludwig, M Bonitz, and Y E Lozovik, J. Phys. A 42, 214016 (2009).