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SUMMARY:Vortices and the BKT transition in regions of competing order - Dr
  Sam Carr\, Kent University
DTSTART:20130425T131500Z
DTEND:20130425T144500Z
UID:TALK42438@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:Regions of competing order often lie near a multicritical poin
 t with enhanced symmetry.  This is particular interesting in two dimension
 s when an O(2) order parameter which supports vortices and a finite-temper
 ature Berezinskii-Kosterlitz-Thouless transition may be enhanced to a high
 er symmetry with no finite temperature phase transition.  We present a the
 oretical description of this phenomenon by reconciling the perturbative sp
 in-waves with the non-perturbative vortex excitations.  We also give a pot
 ential realization of such behavior in quasi-one-dimensional dipolar cold 
 bosons with competing density wave\, superfluid\, and supersolid phases.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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