Reference : Coherent backscattering in the Fock space of a disordered Bose-Hubbard system
Scientific congresses and symposiums : Unpublished conference/Abstract
Physical, chemical, mathematical & earth Sciences : Physics
Coherent backscattering in the Fock space of a disordered Bose-Hubbard system
Schlagheck, Peter mailto [Université de Liège > Département de physique > Physique quantique statistique >]
Quantum Disordered Systems: What’s Next?
24-27 June, 2014
J. Billy (LCAR Toulouse, France), N. Laflorencie (LPT Toulouse, France), G. Lemarié (LPT Toulouse, France)
[en] We predict a generic signature of quantum interference in many-body bosonic systems resulting in a coherent enhancement of the average return probability in Fock space [1]. This enhancement is robust with respect to variations of external parameters even though it represents a dynamical manifestation of the delicate superposition principle in Fock space. It is a genuine quantum many-body effect which lies beyond the reach of any mean-field approach. Using a semiclassical approach based on interfering paths in Fock space, we calculate the magnitude of the backscattering peak and its dependence on gauge fields that break time-reversal invariance. We confirm our predictions by comparing them to exact quantum evolution probabilities in Bose-Hubbard models, and discuss their relevance in the context of many-body thermalization. We furthermore propose a specific experimental setup in order to detect this many-body coherent backscattering phenomenon with ultracold bosonic atoms.

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