Tage Erlander Award Conference "Frontiers of Condensed Matter Physics" 3-8 January 2011
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The Weakly Coupled Pfaffian as a Type I Quantum Hall Liquid

 he Pfaffian phase of electrons in the proximity of a half-filled Landau level is understood to be a p+ip superconductor of composite fermions. We consider the properties of this paired quantum Hall phase when the pairing scale is small, i.e. in the weak-coupling, BCS, limit, where the coherence length is much larger than the charge screening length. We find that, as in a Type I superconductor, the vortices attract so that, upon varying the magnetic field from its magic value at \nu=5/2, the system exhibits Coulomb frustrated phase separation. We propose that the weakly and strongly coupled Pfaffian states exemplify a general dichotomy between Type I and Type II quantum Hall fluids.

Id: 264
Place:
Room: FB54
Starting date:
 06-Jan-2011 14:40
Duration: 50'
Presenters: SPIVAK (U. OF WASHINGTON), Boris