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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-89@lptms.universite-paris-saclay.fr
DTSTART:20130115T110000Z
DTEND:20130115T120000Z
DTSTAMP:20130115T151310Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-christian-hagendorf/
SUMMARY:Séminaire du LPTMS: Christian Hagendorf - LPTMS\, salle 201\, 2èm
 e étage\, Bât 100\, Campus d'Orsay - 15 Jan 13 11:00
DESCRIPTION:Spin chains with dynamical lattice supersymmetry\nChristian Hag
 endorf\, Université de Genève\nStarting from simple observations about t
 he spectrum of the spin-1/2 XXZ and XYZ Heisenberg chains at particular an
 isotropy I will show how to construct a representation of the N=(2\,2) sup
 ersymmetry algebra on the lattice. The supercharges are dynamical: they ch
 ange the number of sites. The construction generalises to higher spin. In 
 particular\, it allows to identify lattice precursors of the N=(2\,2) supe
 rconformal minimal models. The supersymmetry allows to prove the existence
  of zero-energy ground states which have often rich properties related to 
 enumerative combinatorics. I will discuss in detail the case of the Fateev
 -Zamolodchikov chain at spin one whose ground-state components are related
  to the weighted enumeration of alternating sign matrices.
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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