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Dramatically Enhanced Superconductivity in Elemental Bismuth from Excitonic Fluctuation Exchange.
S Koley1, M S Laad2, A Taraphder3
1Department of Physics, St. Anthony's College, Shillong, Meghalaya, 793001, India. sudiptakoley20@gmail.com.
Scientific Reports
|September 10, 2017
Summary
Superconductivity in Bismuth (Bi) arises from a two-fluid model involving excitons and carriers. This excitonic liquid, coupled with resonant scattering, enhances superconductivity in Bi.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Elemental Bismuth (Bi) exhibits superconductivity at ambient pressure.
- The normal state properties of Bismuth remain poorly understood.
- Excitonic effects are proposed to play a role in Bismuth's superconductivity.
Purpose of the Study:
- To investigate the normal state of elemental Bismuth.
- To provide a unified explanation for Bismuth's spectral and transport data.
- To propose a mechanism for superconductivity enhancement in Bismuth.
Main Methods:
- Tight-binding (TB) band-structure calculations.
- Dynamical mean-field theory (DMFT) simulations.
- Development of a two-fluid model.
Main Results:
- A two-fluid model of preformed, fluctuating excitons coupled to few carriers explains Bismuth's normal state.
- Resonant scattering between renormalized carriers and the excitonic liquid enhances superconductivity.
- Logarithmic enhancement of vertex corrections is driven by this interaction.
Conclusions:
- The proposed excitonic model offers a new perspective on Bismuth superconductivity.
- Experimental verification of an excitonic semiconductor with nematicity in Bismuth is suggested.
- External perturbations like pressure could induce a semi-metal to semiconductor transition, revealing competing orders.
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