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SUMMARY:Chiral superconductivity from repulsive interactions in doped grap
 hene - Rahul Nandkishore\, MIT
DTSTART:20110722T143000Z
DTEND:20110722T153000Z
UID:TALK32101@talks.cam.ac.uk
CONTACT:24158
DESCRIPTION:We show that the d+id superconducting state\, which has no kno
 wn experimental realizations\, can be realized in strongly doped graphene.
  We consider graphene that is doped to theMpoint ofthe Brilliouin zone\, w
 here the Fermi surface nesting and the divergent density of states can pro
 duce interaction driven instabilities to  exotic phases with high energy s
 cales. Analyzing the competition between various ordering tendencies withi
 n a renormalisation group framework\, we find that the\nleading instabili
 ty is to d-wave superconductivity\, for any choice of weak repulsive inter
 actions. The dx2−y2 and dxy superconducting states have\nthe same critic
 al temperature Tc. Analysis of the competition of these orders below Tc re
 veals that both orders co-exist to produce d+id superconductivity.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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