Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-02-11
EPL 90, 27006 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 6 figs; (v2) extended discussion of RG flow, final version as published
Scientific paper
10.1209/0295-5075/90/27006
Magnetic impurities in neutral graphene provide a realization of the pseudogap Kondo model, which displays a quantum phase transition between phases with screened and unscreened impurity moment. Here, we present a detailed study of the pseudogap Kondo model with finite chemical potential mu. While carrier doping restores conventional Kondo screening at lowest energies, properties of the quantum critical fixed point turn out to influence the behavior over a large parameter range. Most importantly, the Kondo temperature T_K shows an extreme asymmetry between electron and hole doping. At criticality, depending on the sign of mu, T_K follows either the scaling prediction T_K ~ |mu| with a universal prefactor, or T_K ~ |mu|^x with x = 2.6. This asymmetry between electron and hole doping extends well outside the quantum critical regime and also implies a qualitative difference in the shape of the tunneling spectra for both signs of mu.
Bulla Ralf
Fritz Lars
Vojta Matthias
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