Mixed-valence insulators with neutral Fermi surfaces
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Author(s)
Chowdhury, Debanjan
Sodemann Villadiego, Inti A.
Senthil, T.
Date Issued
May 2018
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Chowdhury, Debanjan et al. “Mixed-Valence Insulators with Neutral Fermi Surfaces.” Nature Communications 9, 1 (May 2018): 1766 © 2018 The Author(s)
Version
Final published version
Abstract
Samarium hexaboride is a classic three-dimensional mixed valence system with a high-Temperature metallic phase that evolves into a paramagnetic charge insulator below 40 K. A number of recent experiments have suggested the possibility that the low-Temperature insulating bulk hosts electrically neutral gapless fermionic excitations. Here we show that a possible ground state of strongly correlated mixed valence insulators-a composite exciton Fermi liquid-hosts a three dimensional Fermi surface of a neutral fermion, that we name the "composite exciton." We describe the mechanism responsible for the formation of such excitons, discuss the phenomenology of the composite exciton Fermi liquids and make comparison to experiments in SmB₆.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1038/S41467-018-04163-2
