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SUMMARY:Dynamical quantum phase transitions - Dr Markus Heyl\, Max-Planck 
 Institute for the Physics of Complex Systems\, Dresden
DTSTART:20181108T141500Z
DTEND:20181108T151500Z
UID:TALK108712@talks.cam.ac.uk
CONTACT:Katarzyna Macieszczak
DESCRIPTION:Nonequilibrium states of closed quantum many-body systems defy
  a thermodynamic description. As a consequence\, constraints such as the p
 rinciple of equal a priori probabilities in the microcanonical ensemble ca
 n be relaxed\, which can lead to quantum states with novel properties of g
 enuine nonequilibrium nature. However\, for the theoretical description it
  is in general not sufficient to understand nonequilibrium dynamics on the
  basis of the properties of the involved Hamiltonians. Instead it becomes 
 important to characterize time-evolution operators which adds time as an a
 dditional scale to the problem. In this talk I will summarize recent progr
 ess in the field of dynamical quantum phase transitions\, which are phase 
 transitions in time with temporal nonanalyticities in matrix elements of t
 he time-evolution operator. These transitions are therefore not driven by 
 an external control parameter\, but rather occur due to sharp internal cha
 nges generated solely by unitary real-time dynamics. I will discuss obtain
 ed insights on general properties of dynamical quantum phase transitions\,
  their physical interpretation\, as well as recent experimental observatio
 ns.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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