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Mixed-valence insulators with neutral Fermi surfaces

Author

Listed:
  • Debanjan Chowdhury

    (Massachusetts Institute of Technology)

  • Inti Sodemann

    (Massachusetts Institute of Technology
    Max-Planck Institute for the Physics of Complex Systems)

  • T. Senthil

    (Massachusetts Institute of Technology)

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.

Suggested Citation

  • Debanjan Chowdhury & Inti Sodemann & T. Senthil, 2018. "Mixed-valence insulators with neutral Fermi surfaces," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04163-2
    DOI: 10.1038/s41467-018-04163-2
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    Cited by:

    1. Christopher A. Mizzi & Satya K. Kushwaha & Priscila F. S. Rosa & W. Adam Phelan & David C. Arellano & Lucas A. Pressley & Tyrel M. McQueen & Mun K. Chan & Neil Harrison, 2024. "The reverse quantum limit and its implications for unconventional quantum oscillations in YbB12," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    2. Zhuo Yang & Christophe Marcenat & Sunghoon Kim & Shusaku Imajo & Motoi Kimata & Toshihiro Nomura & Albin Muer & Duncan K. Maude & Fumitoshi Iga & Thierry Klein & Debanjan Chowdhury & Yoshimitsu Kohama, 2024. "Evidence for large thermodynamic signatures of in-gap fermionic quasiparticle states in a Kondo insulator," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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