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Title: Mixed-valence insulators with neutral Fermi surfaces

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 introduce the mechanism responsible for the formation of such excitons, discuss the phenomenology of the composite exciton Fermi liquids and make comparison to experiments in SmB 6.

Authors:
ORCiD logo [1];  [2];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Max Planck Society, Dresden (Germany)
Publication Date:
Research Org.:
Massachusetts Inst. of Tech., Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1526274
Grant/Contract Number:  
SC0008739
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English

Citation Formats

Chowdhury, Debanjan, Sodemann, Inti, and Senthil, T. Mixed-valence insulators with neutral Fermi surfaces. United States: N. p., 2018. Web. doi:10.1038/s41467-018-04163-2.
Chowdhury, Debanjan, Sodemann, Inti, & Senthil, T. Mixed-valence insulators with neutral Fermi surfaces. United States. doi:10.1038/s41467-018-04163-2.
Chowdhury, Debanjan, Sodemann, Inti, and Senthil, T. Wed . "Mixed-valence insulators with neutral Fermi surfaces". United States. doi:10.1038/s41467-018-04163-2. https://www.osti.gov/servlets/purl/1526274.
@article{osti_1526274,
title = {Mixed-valence insulators with neutral Fermi surfaces},
author = {Chowdhury, Debanjan and Sodemann, Inti and Senthil, T.},
abstractNote = {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 introduce 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.},
doi = {10.1038/s41467-018-04163-2},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {5}
}

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Cited by: 14 works
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Works referenced in this record:

Colloquium: Topological insulators
journal, November 2010