DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2014 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.55: Poster

Wednesday, March 19, 2014, 16:30–18:30, Spree-Palais

Bose-Einstein Condensation with Strong Disorder – Replica Method — •Tama Khellil1, Antun Balaž2, and Axel Pelster31Department of Physics, Freie Universität Berlin, Germany — 2Scientific Computing Laboratory, Institute of Physics Belgrade, University of Belgrade, Serbia — 3Fachbereich Physik und Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Germany

A recent non-perturbative approach towards the dirty boson problem relies on applying the replica method [1]. Here we extend this Hartree-Fock theory for a weakly interacting Bose-gas in a quenched delta-correlated disorder potential from the homogeneous case to a harmonic confinement within the Thomas-Fermi approximation. In this way we obtain and solve coupled self-consistency equations which involve the particle and the condensate density as well as the density of fragmented local Bose-Einstein condensates, which emerge in the respective minima of the random potential landscape. Whereas for weak disorder the results of Huang and Meng from a Bogoliubov theory [2,3] are reproduced only qualitatively, we yield for strong disorder a quantum phase transition to a Bose-glass phase.

[1] R. Graham and A. Pelster, I. J. Bif. Chaos 19, 2745 (2009)

[2] K. Huang, H.-F. Meng, Phys. Rev. Lett. 69, 644 (1992)

[3] G.M. Falco, A. Pelster, and R. Graham, Phys. Rev. A 75, 063619 (2007)

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2014 > Berlin