Reference : Coherent Backscattering in Fock Space: A Signature of Quantum Many-Body Interference ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/165555
Coherent Backscattering in Fock Space: A Signature of Quantum Many-Body Interference in Interacting Bosonic Systems
English
Engl, Thomas []
Dujardin, Julien mailto [Université de Liège - ULiège > Département de physique > Physique quantique statistique >]
Argüelles, Arturo []
Schlagheck, Peter mailto [Université de Liège - ULiège > Département de physique > Physique quantique statistique >]
Richter, Klaus []
Urbina, Juan Diego []
2014
Physical Review Letters
American Physical Society
112
140403
Yes (verified by ORBi)
International
0031-9007
1079-7114
Ridge
NY
[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. 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 that 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.
http://hdl.handle.net/2268/165555

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