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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 SmB6.

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 Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
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
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

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. https://doi.org/10.1038/s41467-018-04163-2
Chowdhury, Debanjan, Sodemann, Inti, and Senthil, T. Wed . "Mixed-valence insulators with neutral Fermi surfaces". United States. https://doi.org/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}
}

Journal Article:
Free Publicly Available Full Text
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Citation Metrics:
Cited by: 25 works
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Figures / Tables:

Fig. 1 Fig. 1: Route to composite exciton Fermi liquids. a Slave-boson representation for the $\tilde{f}$–hole in terms of a holon (blue circle) and spinon (black arrow), coupled mutually to a (zigzag line). b Strong binding of the conduction d–electron (red circle with arrow) to the holon leads to formation of amore » fermionic composite exciton coupled to the same a. c Two-band model when the $f$–valence fluctuates between n$f$= 1 and 2. The composite exciton dispersion $ε$CE (blue dashed line) and a narrow spinon dispersion $ε$$χ$ (orange dashed line) shown for the gauge-invariant combination $ζ$= tCE/t$χ$ > 0. The hybridization between the two gives rise to two bands (orange and green solid lines) and as a result of the filling leads to a semi-metallic state (yellow shaded regions), where the volumes of the two pockets are equal. For $ζ$ < 0, the resulting state would be an insulator« less

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Figures / Tables found in this record:

    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.