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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-25@lptms.universite-paris-saclay.fr
DTSTART:20120301T110000Z
DTEND:20120301T110000Z
DTSTAMP:20120208T120129Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-a-petkovic-2/
SUMMARY:Séminaire du LPTMS: A. Petkovic - LPTMS\, salle 201\, 2ème étage
 \, Bât 100\, Campus d'Orsay - 1 Mar 12 11:00
DESCRIPTION:Fluctuations of the superconducting order parameter in two dime
 nsions\nA. Petkovic\, ENS Paris\nTransport properties of 2D superconductin
 g systems can be very different from those of bulk superconductors because
  thermal and quantum fluctuations of superconducting order parameter are m
 ore pronounced and play a crucial role. First we focus on influence of sup
 erconducting fluctuations on dynamics\, while the system is in the normal 
 state but close to the superconducting transition. In the fluctuational re
 gime\, we derive Ginzburg-Landau-type action under far-from equilibrium co
 nditions. Then\, utilizing it\, we calculate fluctuation-induced density o
 f states and Maki-Thomson- and Aslamazov-Larkin-type contributions to the 
 in-plane electrical conductivity [1\,2]. We propose experimental setup whe
 re our results can be tested: thin superconducting film sandwiched between
  a gate and a substrate\, which have different temperatures and different 
 electrochemical potentials.\nThen\, we concentrate on transport at lower t
 emperatures in close-to-equilibrium conditions investigating influence of 
 quantum fluctuations on unbinding of vortex-untivortex pairs. We determine
  the temperature below which quantum fluctuations dominate over thermal fl
 uctuations and describe the transport in this quantum regime. The crossove
 r from quantum to classical regime is discussed and the quantum correction
  to the classical current-voltage relation is determined [3].\n[1] Phys. R
 ev. Lett. 105\, 187003 (2010) [2] Phys. Rev. B 84\, 064510 (2011) [3] Phys
 . Rev. B 80\, 212504 (2009)
CATEGORIES:seminars
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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