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TZID:Europe/Paris
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UID:1-99@lptms.universite-paris-saclay.fr
DTSTART:20130226T110000Z
DTEND:20130226T120000Z
DTSTAMP:20130418T124114Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-kabir-ramola/
SUMMARY:Séminaire du LPTMS: Kabir Ramola - LPTMS\, salle 201\, 2ème étag
 e\, Bât 100\, Campus d'Orsay - 26 Fév 13 11:00
DESCRIPTION:Columnar Order and Ashkin-Teller Criticality in the Hard Square
  Lattice Gas\nKabir Ramola\, LPTMS Orsay\nThe lattice gas model of particl
 es with nearest and next-nearest-neighbour exclusion on a square lattice (
 hard squares) undergoes a transition from a fluid phase at low density to 
 a columnar ordered phase at high density. The high-activity series for thi
 s model is a singular perturbation series in powers of 1/z\, where z is th
 e fugacity associated with each particle. We show that the different terms
  of the series need to be regrouped to get a Mayer-like series for a polyd
 isperse system of interacting vertical rods. We also analyse the nature of
  the phase transition as a function of density in this system. We argue th
 at the critical properties of the model are that of a more general Ashkin-
 Teller model. We employ Monte Carlo simulations to study the correlations 
 between various quantities in the system to get a fairly precise estimate 
 of the position of the transition on the Ashkin-Teller critical line.
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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