Impurity scattering,Friedel oscillations and RKKY interaction in graphene |
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Authors: | V V Cheianov |
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Institution: | (1) Physics Department, Lancaster University, Lancaster, LA1 4YB, UK |
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Abstract: | We investigate Friedel Oscillations (FO) surrounding a
point scatterer in graphene. We find that the long-distance decay of
FO depends on the symmetry of the scatterer. In particular, the FO
of the charge density around a Coulomb impurity show a faster,
δρ∼1/ r3, decay than in conventional 2D electron
systems. In contrast, the FO of the exchange field which surrounds
atomically sharp defects breaking the hexagonal symmetry of the
honeycomb lattice decay according to the 1/r2 law. We discuss
the consequences of these findings for the temperature dependence of
the resistivity of the material and the RKKY interaction between
magnetic impurities. |
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Keywords: | |
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