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SUMMARY:Possibility of Hot Superconductivity in Charged Graphene - G Baska
 ran\, The Institute of Mathematical Sciences\, Chennai\, India
DTSTART:20101007T131500Z
DTEND:20101007T141500Z
UID:TALK26532@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:In 2002 we combined Pauling's resonating valence bond theory w
 ith band theory and  proposed [1] a phenomenological microscopic Hamiltoni
 an for doped graphene like systems and found high Tc superconductivity. Re
 cently Black-Schaffer and Doniach [2] analyzed our model further and found
  a PT violating d + id symmetry for the order parameter. In another work [
 3] Meng and collaborators found  Pauling's  RVB phase\, interpolating a se
 mi metal and Mott insulating antiferromagnetic phases in repulsive Hubbard
  model at half filling in honeycomb lattice. In this talk we discuss our r
 ecent work [4]\, where we replace our old model by a more realistic repuls
 ive Hubbard model and perform an extensive\, state of the art\,  variation
 al Monte Carlo analysis. We find that graphene\, around an optimal doping\
 , could support Kosterlitz-Thouless superconductivity\, reaching room temp
 erature scales. How could Graphene\, which is weakly or at best a moderate
 ly correlated electron system\, support a high Tc superconductivity ? We s
 uggest an adiabatic connection of our superconductivity in doped graphene 
 to strong coupling RVB superconductivity.\n\nReferences\n# G. Baskaran\, P
 hys. Rev. B *65*\, 212505 (2002)\n# A.M. Black-Schaffer and S. Doniach\, P
 hys. Rev. B *75*\, 134512 (2007)\n# Z. Y. Meng\, T. Lang\, S. Wessel\, F. 
 Assaad\, and A. Muramatsu\, Nature *464*\, 847 (2010)\n# S Pathak\, V B Sh
 enoy and G. Baskaran\, Phys. Rev. B *81*\, 085431 (2010)\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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