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SUMMARY:Strain engineering of electronic correlations in graphene - Dr Luc
 ian Covaci\, University of Antwerp
DTSTART:20121203T141500Z
DTEND:20121203T151500Z
UID:TALK41658@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:In graphene\, strain has a significant effect on the electroni
 c properties. Due to the peculiar lattice symmetry and band structure\, th
 e effect of strain in graphene is unique. Any deformation of the lattice s
 tructure affects the low energy quasiparticles near the Dirac point in the
  same way a gauge field does. The crucial difference is the fact that the 
 effective field has opposite sign in the two Dirac cones and thus the tota
 l field vanishes and time reversal symmetry is restored. Of particular int
 erest are inhomogeneous strain configurations that give spatially varying 
 gauge fields corresponding to almost constant pseudo-magnetic fields. In s
 uch cases the unit cell has a large number of atoms and the direct diagona
 lization of the single-particle Hamiltonian is not possible. We have inste
 ad developed approximate methods to find the Green's function and subseque
 ntly physical properties [1]. With great improvement in speed by performin
 g computations on video cards (GPUs) we studied the effect of various stra
 in configurations on the electronic properties. We have shown how the supe
 rconducting proximity effect is modified [2]\, how a valley filter can be 
 achieved by using a combination of pseudo and real magnetic fields [3] and
  we have presented possible strain configurations by using pillars deposit
 ed on substrates [4]. We will present an overview of our recent results an
 d give insight into the possibility of inducing magnetism in graphene by a
 pplying strain.\n\nReferences: [1] L. Covaci\, F.M. Peeters and M. Berciu\
 , Phys. Rev. Lett. \n105\, 167006 (2010). [2] L. Covaci and F.M. Peeters\,
  Phys. Rev. B 84\,\n241401(R) (2011). [3] A. Chaves\, L. Covaci\, K. Rakhi
 mov\, G.A. Farias and F.M. Peeters\, Phys. Rev. B 82\, 205430 (2010). [4] 
 M. Neek-Amal\, L. Covaci\, and F. M. Peeters\, Phys. Rev. B 86\, 041405(R)
  (2012).\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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