[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.
[1] T. Engl, J. Dujardin, A. Argüelles, P. Schlagheck, K. Richter, and J. D. Urbina, Phys. Rev. Lett. 112, 140403 (2014).
Disciplines :
Physics
Author, co-author :
Engl, Thomas
Dujardin, Julien
Tisserond, Emilie
Argüelles, Arturo
Richter, Klaus
Urbina, Juan Diego
Schlagheck, Peter ; Université de Liège > Département de physique > Physique quantique statistique
Language :
English
Title :
Coherent backscattering in the Fock space of a disordered Bose-Hubbard system
Publication date :
June 2015
Event name :
Quantum Correlated Matter and Chaos: A workshop in Honor of the Life and Work of Richard Prange
Event organizer :
Steven M. Anlage (University of Maryland, USA), Shmuel Fishman (Technion, IL), Günter Radons (TU Chemnitz, DE)
