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SUMMARY:Quantum transport in mesoscopic graphene/superconductor hybrid dev
 ices - Miss Carly Richardson\, Cavendish Laboratory\, University of Cambri
 dge
DTSTART:20140519T131500Z
DTEND:20140519T141500Z
UID:TALK52316@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:Graphene’s band structure and established device fabrication
  methods make it an ideal starting point for investigating Dirac physics i
 n a range of materials\, notably the surface states of bulk topological in
 sulators. A better understanding of phenomena related to the Dirac cone is
  required\, particularly in devices with superconducting contacts.\n\nIn g
 raphene driven superconducting by the proximity effect\, zero energy modes
  are predicted in vortex cores. To explore whether the presence of such mo
 des can be detected solely through charge transport\, we have fabricated J
 osephson junction arrays on graphene. We find that the mean conductance an
 d universal conductance fluctuations are enhanced below the critical tempe
 rature and field of the superconductor\, with greater enhancement away fro
 m the graphene Dirac point. We also observe features in the magnetoconduct
 ance at rational fractions of flux quanta per array unit cell\, which we a
 ttribute to the formation of vortices in the arrays.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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