Affiliation:
1. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139
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
2
.
Funder
DOE office basic energy science
Mathworks fellowship
Simons Foundation
Publisher
Proceedings of the National Academy of Sciences
Cited by
20 articles.
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