ICMT Seminar: "Interaction, disorder and topological superconductivity in nodal-line semimetals"
(sign-up)Yuxuan Wang, University of Illinois Urbana Champaign
Institute for Condensed Matter Physics
In the first part of the talk, We study surface superconductivity in doped nodal-line semimetals. The leading weak-coupling instability in the bulk is toward a chiral superconducting order, which fully gaps the Fermi surface. We show that in this state the surface also becomes superconducting, with p +i p symmetry. The surface SC state is "topological" as long as it is fully gapped, and in contrast to true two-dimensional p +i p superconductors, these Majorana zero modes arise even in the "strong pairing" regime where the chemical potential is entirely above/below the drumhead.
In the second part we report an RG study of the interplay between long-range Coulomb interaction and various types of disorders. It has been found that in the clean case the Coulomb interaction is marginally irrelevant, leading to a conventional Fermi liquid behavior. However, the disorder couplings is also marginal at tree level and should be treated on an equal footing with Coulomb interaction. We found that disorder effects flow to strong coupling, and also drives the Coulomb interaction to strong coupling, thus destroying the Fermi liquid behavior.
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