Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 6: Dynamics in many-body systems: interference, equilibration and localization I (joint session DY/TT)

DY 6.1: Talk

Monday, March 12, 2018, 10:00–10:15, EB 107

Post-Ehrenfest many-body quantum interferences far-out-of-equilibrium many-body systems — Steve Tomsovic^1,4, Denis Ullmo², Peter Schlagheck³, •Juan-Diego Urbina⁴, and Klaus Richter⁴ — ¹Washington State University, USA — ²Universite Paris Sud, France — ³University of Liege, Belgium — ⁴University of Regensburg, Germany

Many-body quantum dynamics in isolated systems far from equilibrium generate interferences beyond the Ehrenfest time where quantum and classical expectation values diverge, with recent interest in the role these interferences play in the spreading of quantum information across the many degrees of freedom[1]. We have developed a semiclassical theory which properly incorporates such quantum interference effects and showed that, for mesoscopically populated Bose-Hubbard systems, it captures post-Ehrenfest quantum phenomena very accurately even to the point to alllow for high-precision many-body spectroscopy [2].

We present here a description of this novel approach and point out how it can be used to improve the heavily used truncated Wigner method [3] by incorporating exact degenaracies of classical actions responsible of robust many-body interference effects.
S. H. Shenker and D. Stanford, JHEP 3, 67 (2014).
S. Tomsovic, P. Schlagheck, D. Ullmo, J. D. Urbina, and K. Richter arXiv 1711.04693 (2017).
A. Sinatra, C. Lobo, and Y. Castin, J. Phys. B: Atom. Molec. Opt. Phys. 35, 3599 (2002).