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The NS2 (NanoStructures at the NanoSecond timescale) group is interested in the dynamical properties of mesoscopic systems. We are presently investigating, among other things, the dynamics of SNS or SFS junctions (S=superconductor, N=normal metal, F=ferromagnet) and non-Gaussian high frequency quantum noise.
NS2 is part of the Laboratoire de Physique des Solides (LPS, Solid State Laboratory), a Centre National de Recherche Scientifique (CNRS) laboratory housed on the campus of the Université Paris-Sud 11 in Orsay (about 30km south-west of Paris on the Saclay plateau).
We are always happy to talk to bright and motivated students interested in internships, PhD positions or postdocs. Please feel free to contact us.
February 2012 Pascale Diener has joined the group as a postdoc. She comes to us from SRON (the Netherlands Institute for Space Research.) Welcome, Pascale!
January 2012 Jonathan Graveline is visiting the group for two months from the University of Sherbrooke, Quebec, Canada. Welcome, Jonathan!
The supercurrent across a Josephson junction --- two superconductors in contact via a non-SC spacer layer --- is a periodic function of the superconducting phase difference across the junction, the Josephson phase. The boundary conditions for the Josephson phase can be modified inter alia by applying a static magnetic field to the junction or by coupling microwaves to the junction (thus inducing time-varying fields). We study the interference between these two effects. arXiv
June 2011 The phase-cooling paper (see October 2010) is out in PRL as 'Microwave Cooling of Josephson Plasma Oscillations'. It has been selected as an Editor's Suggestion.
December 2010 Charis's postdoc work with the Quantronics Group at Saclay is out as 'Andreev bound states in supercurrent-carrying carbon nanotubes revealed' in Nature Physics. See also the associated 'News and Views'.
October 2010 Did you know that a vibrating mirror can be cooled (made to vibrate less) using light? Marco, Ivana and Jakob have done the same thing for the Josephson phase --- the phase difference between the two superconductors on either side of a Josephson junction --- with microwave radiation. A version of their paper 'Cavity sideband cooling of the Josephson phase' is now available on the arXiv.
July 2010 Francesca Chiodi has succesfully defended her dissertation 'Dynamical effects in superconducting/normal metal/Superconducting long Josephson junctions', supervised by Bertrand Reulet and Hélène Bouchiat. Congratulations, Dr. Chiodi!
