Do Dynamical Excitonic Liquid Correlations Mediate Superconductivity in Elemental Bismuth?

Abstract

Motivated by the remarkable discovery of superconductivity in elemental Bismuth, we study its normal state in detail using a combination of tight-binding (TB) and-structural 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.

References in corpus (14)

• Orbital-Selective Mott transition out of band degeneracy lifting
• Experimental evidence for bulk superconductivity in pure Bismuth single crystal at ambient pressure
• Signatures of Electron Fractionalization in Ultraquantum Bismuth
• Observation of a Nematic Quantum Hall Liquid on the Surface of Bismuth
• Optical properties of correlated materials -- Generalized Peierls approach and its application to VO2
• Band insulator to Mott insulator transition in a bilayer Hubbard model
• Charge carrier interaction with a purely electronic collective mode: Plasmarons and the infrared response of elemental bismuth
• Quantitative analysis of nonadiabatic effects in dense H${}_3$S and PH${}_3$ superconductors
• Infrared Conductivity of Elemental Bismuth under Pressure: Evidence for an Avoided Lifshitz-Type Semimetal-Semiconductor Transition
• A multi-orbital iterated perturbation theory for model Hamiltonians and real material-specific calculations of correlated systems
• Pressure Driven Phase Transition in 1T-TiSe${}_2$ , a MOIPT+DMFT Study
• Charge-Density-Wave Order in 2H-NbSe${}_2$
• Quantum Criticality in the 122 Iron Pnictide Superconductors Emerging from Orbital-Selective Mottness
• Multiband Semimetallic Electronic Structure of Superconducting Ta2PdSe5

Cited by in corpus (3)

• Development of an efficient impurity solver in dynamical mean field theory for multi-band systems: The iterative perturbation theory combined with the parquet equations
• Anomalous Hall Effect in Bismuth
• Periodicity of superconducting shape resonances in thin films