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Event Number 2302

  Thursday, November 3rd, 2011

R. G. Herb Condensed Matter Seminar
Chiral superconductivity from repulsive interactions in doped graphene
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Rahul Nandkishore, Massachusetts Institute of Technology
Abstract: We present a model wherein repulsive interactions unambiguously lead to superconductivity with enhanced Tc. The superconducting state is the chiral d + id superconducting state, which has no known experimental realizations. Intriguingly, our model has a natural realization in strongly doped graphene. We consider graphene that is doped to the M point of the Brilliouin zone, where the Fermi surface nesting and the divergent density of states can produce interaction driven instabilities to exotic phases with high energy scales. Analyzing the competition between various ordering tendencies within a renormalisation group framework, we find that the leading instability is to d-wave superconductivity, for any choice of weak repulsive interactions. The dx2-y2 and dxy superconducting states have the same critical temperature Tc . Analysis of the competition of these orders below Tc reveals that both orders co-exist to produce d + id superconductivity.
Host: Chubukov
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