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Kondo effect with Wilson fermions

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arxiv 2107.07270 v2 pith:OA5ZKIKZ submitted 2021-07-15 hep-lat cond-mat.mes-hallcond-mat.str-elhep-ph

Kondo effect with Wilson fermions

classification hep-lat cond-mat.mes-hallcond-mat.str-elhep-ph
keywords kondoeffectwilsonfermionscondensatefermionheavyphase
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the Kondo effect with Wilson fermions. This is based on a mean-field approach for the chiral Gross-Neveu model including four-point interactions between a light Wilson fermion and a heavy fermion. For massless Wilson fermions, we demonstrate the appearance of the Kondo effect. We point out that there is a coexistence phase with both the light-fermion scalar condensate and Kondo condensate, and the critical chemical potentials of the scalar condensate are shifted by the Kondo effect. For negative-mass Wilson fermions, we find that the Kondo effect is favored near the parameter region realizing the Aoki phase. Our findings will be useful for understanding the roles of heavy impurities in Dirac semimetals, topological insulators, and lattice simulations.

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