Tight-binding theory of the spin-orbit coupling in graphene

  title={Tight-binding theory of the spin-orbit coupling in graphene},
  author={Sergej Konschuh and Martin Gmitra and Jaroslav Fabian},
The spin-orbit coupling in graphene induces spectral gaps at the high-symmetry points. The relevant gap at the point is similar to the splitting of the p orbitals in the carbon atom, being roughly 8.5 meV. The splitting at the K point is orders of magnitude smaller. Earlier tight-binding theories indicated the value of this intrinsic gap of 1 eV, based on the coupling. All-electron first-principles calculations give much higher values, between 25 and 50 eV, due to the presence of the orbitals… CONTINUE READING
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