Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 36: Quantum gases: Effects of interactions

Q 36.1: Group Report

Thursday, March 20, 2014, 10:30–11:00, UDL HS2002

BEC with loss – a paradigm for an open many-body system — •Sandro Wimberger — ITP, Universität Heidelberg, Philosophenweg 19, 69121 Heidelberg — Dipartimento di Fisica e Science della Terra, Università di Parma, Via G.P. Usberti 7/a, I-43124 Parma

Modern atom-optical experiments allow for an unprecedented control of microscopic degrees of freedom, not just in the initialization but also in the coherent and incoherent evolution of quantum states. We focus on the dynamics of ultra-cold bosons in an optical lattice with controlled and localized dissipation [1-4]. In the weakly interacting, or semiclassical regime, a quantum version of stochastic resonance is seen [1]. For suitable initial states, strong dissipation can stabilize a Bose-Einstein condensate, such that it remains coherent even in the presence of strong interactions between its constituents [2]. Using an exact unraveling of the underlying master equation for small systems and a perturbative approach for large ones, we predict, in particular, the formation of stable and coherent soliton-like structures [3,4].
[1] D. Witthaut, F. Trimborn, S. Wimberger, PRL 101, 200402 (2008)
[2] D. Witthaut, F. Trimborn, H. Hennig, G. Kordas, T. Geisel, S. Wimberger, PRA 83, 063608 (2011)
[3] G. Kordas, S. Wimberger, D. Witthaut, EPL 100, 30007 (2012)
[4] G. Kordas, S. Wimberger, D. Witthaut, PRA 87, 043618 (2013)