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SUMMARY:Topology and scale invariance in atomic Flatland - Prof. Jean Dali
 bard\, Collège de France and Laboratoire Kastler Brossel
DTSTART:20200116T141500Z
DTEND:20200116T151500Z
UID:TALK126931@talks.cam.ac.uk
CONTACT:Katarzyna Macieszczak
DESCRIPTION:In a 2D world\, most transitions towards ordered states of mat
 ter like crystals or magnets would not occur because of the increased role
  of fluctuations. However\, non-conventional topological transitions can s
 till occur\, as understood by Kosterlitz and Thouless. In this talk I will
  present some important features of Flatland physics explored with cold at
 omic gases\, such as the existence of a superfluid phase with quasi long-r
 ange order. I will also investigate the scale invariance of these fluids a
 nd discuss the existence of "breathers"\, i.e.\,  specific initial shapes 
 leading to a periodic evolution of the gas when it is suddenly immersed in
  a harmonic potential. Finally using the notion of a synthetic dimension\,
  I will connect the physics of these atomic systems with other prominent t
 opological properties of matter\, such as quantum-Hall type phenomenon.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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