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SUMMARY:Complex temperature: correlation functions and quantum critical po
 ints - Dr Chris Hooley\, University of St Andrews
DTSTART:20110505T131500Z
DTEND:20110505T144500Z
UID:TALK31053@talks.cam.ac.uk
CONTACT:Joe Bhaseen
DESCRIPTION:I shall briefly review previous work (due to Yang\, Lee\, Fish
 er\, and others) that uses the analytic properties of the partition functi
 on at complex temperature as a way of categorising and interpreting the be
 haviour of many-body systems.  Such work has traditionally concentrated on
  calculating the free energies of various classical systems\, with a view 
 to analysing their phase transitions.  I shall instead ask two questions t
 hat do not appear to have been posed before.  First\, how do the correlati
 on functions of simple magnetic models behave when the temperature becomes
  complex?  Second\, how does the analytic structure of the partition funct
 ion in the complex temperature plane change as a quantum critical point is
  approached\, and what can we learn from those changes?  This is very much
  work in progress (in collaboration with Dr Vadim Oganesyan and Ms Felicit
 as Beichert)\, but I shall present a couple of intriguing interim results.
 \n\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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