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- W4385774543 abstract "We calculate the zero-temperature universal electrical conductivity at a superconductor-insulator transition in two spatial dimensions. We focus on transitions in the universality class of the dirty 3d XY model. We use a dual model consisting of a single Dirac fermion at zero density coupled to a Chern-Simons gauge field in the presence of a quenched random mass, with or without an unscreened Coulomb interaction. Our calculation is performed in a $1/N_f$ expansion, where $N_f$ is the number of Dirac fermions. At zeroth order, the model exhibits particle-vortex self-dual electrical transport with $sigma_{xx} lesssim (2e)^2/h$ and small, but finite $sigma_{xy}$. Corrections of $mathcal{O}(1/N_f)$ due to fluctuations in the Chern-Simons gauge field and disorder produce violations of self-duality. We find these violations to be milder when the Coulomb interaction is present." @default.
- W4385774543 created "2023-08-12" @default.
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- W4385774543 date "2023-08-09" @default.
- W4385774543 modified "2023-10-18" @default.
- W4385774543 title "Universal conductivity at a 2d superconductor-insulator transition: the effects of quenched disorder and Coulomb interaction" @default.
- W4385774543 doi "https://doi.org/10.48550/arxiv.2308.05155" @default.
- W4385774543 hasPublicationYear "2023" @default.
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