Instability and topological robustness of Weyl semimetals against Coulomb interaction

Article

关键词: BOSE-EINSTEIN CONDENSATION;    MAGNETIC MONOPOLES;    EXCITON POLARITONS;    HALL CONDUCTANCE;    SPIN ICE;    ELECTRON;    GRAPHENE;    FERMIONS;    POINTS;    STATE;   

DOI  :  10.1103/PhysRevB.96.195160

来源: SCIE

【 摘 要 】

There is a close connection between various new phenomena in Weyl semimetals and the existence of linear band crossings in the single particle description. We show, by a full self-consistent mean-field calculation, how this picture is modified in the presence of long-range Coulomb interactions. The chiral symmetry breaking occurs at strong enough interactions and the internode interband excitonic pairing channel is found to be significant, which determines the gap-opened band profile varying with interaction strength. Remarkably, in the resultant interacting phase, finite band Chern number jumps in the three-dimensional momentum space are retained, indicating the robustness of the topologically nontrivial features.

【 授权许可】

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