Tuesday's Stat.Phys. seminar

[Cond.Matt. & Stat.Mech.Section]

 JOINT ICTP/SISSA STATISTICAL PHYSICS SEMINAR

 

Tuesday, 21 December   -   11:30 hrs.

 


Luigi Stasi Seminar Room,  ICTP Leonardo Building - 1st floor

 

 

Shivaji SONDHI      ( Princeton University )

 

"The weakly coupled Pfaffian as  a Type I quantum Hall liquid"



Abstract



The 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.