Dramatically Enhanced Superconductivity in Elemental Bismuth from Excitonic Fluctuation Exchange

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ID: 36188
2017
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Abstract
Abstract Motivated by the remarkable discovery of superconductivity in elemental Bismuth at ambient pressure, we study its normal state in detail using a combination of tight-binding (TB) band-structure supplemented by dynamical mean-field theory (DMFT). We show that a two-fluid model composed of preformed and dynamically fluctuating excitons coupled to a tiny number of carriers provides a unified rationalization of a range of ill-understood normal state spectral and transport data. Based on these, we propose that resonant scattering involving a very low density of renormalized carriers and the excitonic liquid drives logarithmic enhancement of vertex corrections, boosting superconductivity in Bi. A confirmatory test for our proposal would be the experimental verification of an excitonic semiconductor with electronic nematicity as a ‘competing order’ on inducing a semi-metal-to semiconductor transition in Bi by an external perturbation like pressure
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koley2017dramaticallyscientific Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Koley, S.;Laad, M. S.;Taraphder, A.;
Journal Scientific reports
Year 2017
DOI
DOI not found
URL
http://link.springer.com/article/10.1038/s41598-017-11269-y
Keywords Keywords not found

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