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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Chowdhury D,Sodemann I,Senthil Tdoi
10.1038/s41467-018-04163-2subject
Has Abstractpub_date
2018-05-02 00:00:00pages
1766issue
1issn
2041-1723pii
10.1038/s41467-018-04163-2journal_volume
9pub_type
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