Mixed-valence insulators with neutral Fermi surfaces

Chowdhury, Debanjan; Sodemann, Inti; Senthil, T.

doi:10.1038/s41467-018-04163-2

Title: Mixed-valence insulators with neutral Fermi surfaces

Journal Article · Wed May 02 00:00:00 EDT 2018 · Nature Communications

DOI:https://doi.org/10.1038/s41467-018-04163-2· OSTI ID:1526274

^[1]; Sodemann, Inti ^[2]; Senthil, T. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Max Planck Society, Dresden (Germany)

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.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0008739

OSTI ID:: 1526274

Journal Information:: Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 54 works

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