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SUMMARY:Superconducting states in time reversal invariant Landau levels - 
 Prof. Bruno Uchoa\, Oklahoma
DTSTART:20150806T131500Z
DTEND:20150806T141500Z
UID:TALK60269@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:In this talk\, I will address the problem of superconductivity
  in Landau levels that preserve time reversal symmetry (TRS). Those Landau
  levels have been experimentally observed in a class of strained honeycomb
  lattices (both atomic and optical)\, where sharply separated Landau level
 s are formed in the complete absence of a magnetic flux at every lattice s
 ite. I will show that superconductivity is quantum critical at integer fil
 ling of the Landau levels\, when the system becomes incompressible.  At pa
 rtial filling\, the quenching of the kinetic energy due to the Landau leve
 ls leads to a crossover to an exotic regime\, where the critical temperatu
 re scales linearly with the coupling in the weak coupling limit\, rather t
 han exponentially. Due to this anomalous scaling\, the critical temperatur
 e can be orders of magnitude larger than in conventional weak coupling sup
 erconductors\, and may be triggered by phonons when screening is restored 
 at length scales larger than the magnetic length. Since the system is gapp
 ed in bulk\, the supercurrent flows along the edges of the system. I will 
 show that normal-superconducting junctions have unique transport and spect
 roscopy signatures of those states. 
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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