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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-98@lptms.universite-paris-saclay.fr
DTSTART:20130409T110000Z
DTEND:20130409T120000Z
DTSTAMP:20130418T123936Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-p-soule-et-p-e-larre/
SUMMARY:Séminaire du LPTMS: P. Soulé et P.-E. Larré - LPTMS\, salle 201\
 , 2ème étage\, Bât 100\, Campus d'Orsay - 9 Avr 13 11:00
DESCRIPTION:Wave pattern generated by an obstacle moving in a one-dimension
 al polariton condensate\nPierre-Elie Larré\, LPTMS\nMotivated by recent e
 xperiments on generation of wave patterns in polariton condensates\, we an
 alyze superfluid and dissipative characteristics of the one-dimensional fl
 ow of a nonresonantly-pumped polariton condensate past a localized obstacl
 e. We consider the response of the condensate flow in the weak-perturbatio
 n limit\, but also by means of the Whitham averaging theory in the nonline
 ar regime. One of the results of this work is the identification of a new 
 time-dependent regime separating two types of stationary flows (a mostly v
 iscous one and another one dominated by Cherenkov radiation).\nI will also
  present results obtained by including polarization effects in the descrip
 tion of the polariton condensate\, and I will argue that similar effects i
 n presence of an acoustic horizon offer possibilities for demonstrating Ha
 wking-like radiation in polariton condensates.\nMany-body study of a quant
 um point contact in the fractional quantum Hall regime\nPaul Soulé\, LPTM
 S\nFractional Quantum Hall (FQH) fluids have a low-energy effective theory
  localized at their edges. The edge states are expected to form a very spe
 cial one-dimensional strongly interacting electronic system\, a chiral Lut
 tinger liquid. Depending on FQH phases\, a variety of 1D models has been p
 roposed. But only poor experimental agreements have been found yet. Using 
 exact diagonalizations in the cylinder geometry we identify the edge modes
  in the presence of a parabolic confining potential at Landau level fillin
 g factors v=1/3 and v=5/2. If we change the sign of the potential we can a
 ccess both the tunneling through the bulk of the fluid and the tunneling b
 etween spatially separated droplets\, and measure numerically Luttinger pa
 rameters in both cases. These phenomena are at the basis of tunneling expe
 riments in quantum point contact devices of two-dimensional electron gases
 .\nP. Soulé\, T. Jolicoeur\, Phys. Rev. B 86\, 115214 (2012)P. Soulé\, T
 . Jolicoeur\, in preparation
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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