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SYQC: Symposium Facets of many-body quantum chaos

SYQC 1: Facets of many-body quantum chaos

SYQC 1.4: Hauptvortrag

Dienstag, 28. September 2021, 15:15–15:45, Audimax 2

Post-Ehrenfest many-body quantum interferences in ultracold atoms — •Steven Tomsovic — Department of Physics and Astronomy, Washington State University, Pullman, WA USA

Far out-of-equilibrium many-body quantum dynamics in isolated systems necessarily generate interferences beyond an Ehrenfest time scale, where quantum and classical expectation values diverge. Ultracold atomic gases provide a promising setting to explore these phenomena. Theoretically speaking, the heavily-relied-upon truncated Wigner approximation leaves out these interferences. We develop a semiclassical theory of coherent state propagation for many-body bosonic systems, which properly incorporates such missing quantum effects. For mesoscopically populated Bose-Hubbard systems, it is shown that this theory captures post-Ehrenfest quantum interference phenomena very accurately, and contains relevant phase information to perform many-body spectroscopy with high precision.