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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2302
DTSTART:20111103T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T124409Z
LAST-MODIFIED:20111021T171531Z
LOCATION:5310 Chamberlin
SUMMARY:Chiral superconductivity from repulsive interactions in doped 
 graphene\, R. G. Herb Condensed Matter Seminar\, Rahul Nandkishore\, M
 assachusetts Institute of Technology
DESCRIPTION:We present a model wherein repulsive interactions unambigu
 ously 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 real
 ization in strongly doped graphene. 
\n
\nWe 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 d
 riven instabilities to exotic phases with high energy scales. Analyzin
 g the competition between various ordering tendencies within a renorma
 lisation group framework\, we find that the leading instability is to 
 d-wave superconductivity\, for any choice of weak repulsive interactio
 ns. The d<sub>x<sup>2</sup>-y<sup>2</sup></sub> and dxy superconductin
 g states have the same critical temperature Tc . Analysis of the compe
 tition of these orders below Tc reveals that both orders co-exist to p
 roduce d + id superconductivity. 
URL:https://www.physics.wisc.edu/events/?id=2302
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