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UID:DSC-16115
DTSTART;TZID=Europe/Berlin:20190619T130000
SEQUENCE:1561382469
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20190619T140000
URL:https://www.dresden-science-calendar.de/calendar/de/detail/16115
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Schlagheck: IMPRS Seminar: Quantum and Semiclassical Dynamics of In
 teracting Bosons
CLASS:PUBLIC
DESCRIPTION:Speaker: Peter Schlagheck\nInstitute of Speaker: University of 
 Liège\nTopics:\nPhysik\n Location:\n  Name: MPI-PKS ()\n  Street: Nöthni
 tzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49 (0)351 871 0\n  Fax:
  \nDescription: Recent experimental studies of thermalization and localiza
 tion phenomena with ultracold bosonic atoms in optical lattices have under
 lined the role of such bosonic many-body systems as quantum simulators and
  pose new challenges for numerical simulations [1\,2]. As genuine quantum 
 many-body methods are often limited in applicability for large systems and
 /or do not always provide sufficient insight into relevant mechanisms\, se
 miclassical approaches become useful in order to obtain a theoretical unde
 rstanding of bosonic many-body dynamics. In my talk I shall focus on two c
 omplementary semiclassical approaches. On the one hand\, the van Vleck-Gut
 zwiller propagator can be generalized to the many-body domain. This framew
 ork allows one to predict a significant deviation from quantum ergodicity 
 due to coherent backscattering in Fock space\, which is confirmed by numer
 ical simulations [3]. On the other hand\, the time evolution of a Bose-Ein
 stein condensate that loses its matter-wave coherence due to significantly
  strong interaction effects can be faithfully predicted by an adaptation o
 f Maslov's WKB method\, which amounts to representing the quantum many-bod
 y system in terms of a discrete sum over complexified Gross-Pitaevskii tra
 jectories [4]. We discuss how the insight provided by these semiclassical 
 approaches allows one to enhance the applicability of the quasiclassical T
 runcated Wigner method. [1] J.-y. Choi et al.\, Science 352\, 1547 (2016).
  [2] A. M. Kaufman et al.\, Science 353\, 794 (2016). [3] T. Engl et al.\,
  Phys. Rev. Lett. 112\,  140403  (2014). [4] S. Tomsovic et al.\, Phys. 
 Rev. A 97\, 061606(R) (2018).
DTSTAMP:20260820T234559Z
CREATED:20190527T220856Z
LAST-MODIFIED:20190624T132109Z
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