Spin-triplet superconductivity from interband effect in doped insulators

Abstract

Despite being of fundamental importance and potential interest for topological quantum computing, spin-triplet superconductors remain rare in solid state materials after decades of research. In this work, we present a general mechanism for spin-triplet superconductivity in multi-band systems, where a non-retarded pairing interaction between conduction electrons is produced by their electronic repulsion to a third-electron undergoing a virtual interband transition. Our theory is analytically controlled by an interband hybridization parameter, and explicitly demonstrated in doped band insulators with the example of an extended Hubbard model. In light of this theory, we propose that recently discovered dilute superconductors such as ZrNCl and WTe${}_2$ are spin-triplet, and compare the expected consequences of our theory with experimental data.

arXiv comment7.5 pages + refs and appendix

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• Inducing ${\mathbb{Z}}_2$ Topology in Twisted Nodal Superconductors
• Pairing around a Single Dirac Point: A Unifying View of Kohn-Luttinger Superconductivity in Chern Bands, Quarter Metals, and Topological Surface States
• Pressure-induced exciton formation and superconductivity in platinum-based mineral Sperrylite
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• Dominant Excitonic Superconductivity in a Three-component Hubbard Chain
• Tuning superconducting pairing symmetry via a staggered potential in the doped honeycomb Hubbard model
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