Competing many-body instabilities and unconventional superconductivity in graphene
作者： Maximilian L. Kiesel , Christian Platt , Werner Hanke , Dmitry A. Abanin , Ronny Thomale
DOI: 10.1103/PHYSREVB.86.020507
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摘要: The band structure of graphene exhibits van Hove singularities (VHSs) at dopings $x=\ifmmode\pm\else\textpm\fi{}1/8$ away from the Dirac point. Near VHS, interactions effects, enhanced due to large density states, can give rise various many-body phases. We study competition between instabilities in using functional renormalization group. predict a rich phase diagram, which, depending on as well range and scale Coulomb interactions, contains $d+id$-wave superconducting (SC) phase, or spin-density-wave VHS. $d+id$ state is expected exhibit quantized charge spin Hall response, Majorana modes bound vortices. Nearby we find singlet triplet $f$-wave SC
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