Spin-triplet superconductivity from excitonic effect in doped insulators

Author(s)
Crépel, Valentin; Fu, Liang
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Abstract
Significance We present a mechanism for unconventional superconductivity in doped band insulators, where short-ranged pairing interaction arises from Coulomb repulsion due to virtual interband or excitonic processes. Remarkably, electron pairing is found upon infinitesimal doping, giving rise to Bose–Einstein condensate (BEC)–Bardeen–Cooper–Schrieffer (BCS) crossover at low density. Our theory explains puzzling behaviors of superconductivity and predicts spin-triplet pairing in electron-doped ZrNCl and WTe <jats:sub>2</jats:sub> .
Date issued
2022-03-29
URI
https://hdl.handle.net/1721.1/141856
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Proceedings of the National Academy of Sciences
Publisher
Proceedings of the National Academy of Sciences
Citation
Crépel, Valentin and Fu, Liang. 2022. "Spin-triplet superconductivity from excitonic effect in doped insulators." Proceedings of the National Academy of Sciences, 119 (13).
Version: Final published version
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