Superfluid-insulator transition and the BEC-BCS crossover in the Rashba moat band

We study the superconducting transition in a two-dimensional electron gas with strong Rashba spin-orbit coupling. We assume low electron density, such that only the majority spin band participates in the transition. We show that the superconducting transition follows either the Bose-Einstein condens...

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Bibliographic Details
Published in:Physical review. B 2019-03, Vol.99 (10), p.104505, Article 104505
Main Authors: Allami, Hassan, Starykh, O. A., Pesin, D. A.
Format: Article
Language:English
Subjects:
Chemical potential
Crossovers
Electron density
Electron gas
Electron spin
Fluids
Organic chemistry
Spin-orbit interactions
Superconductivity
Superfluidity
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Summary:We study the superconducting transition in a two-dimensional electron gas with strong Rashba spin-orbit coupling. We assume low electron density, such that only the majority spin band participates in the transition. We show that the superconducting transition follows either the Bose-Einstein condensation (BEC) or the Bardeen-Cooper-Schrieffer (BCS) scenarios, depending on the position of the chemical potential with respect to the bottom of the majority band, and the strength of the Coulomb repulsion between electrons. Hence, the BEC-BCS crossover in this system can be driven either by the change in the chemical potential, or the distance to a gate.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.99.104505