Mixed-valence insulators with neutral Fermi surfaces
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 neutr...
| Main Authors: | , , |
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| Format: | Article |
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Nature Publishing Group
2018
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| Online Access: | http://hdl.handle.net/1721.1/118845 https://orcid.org/0000-0002-1824-5167 |
| _version_ | 1826189296061644800 |
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| author | Chowdhury, Debanjan Sodemann Villadiego, Inti A. Senthil, T. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Chowdhury, Debanjan Sodemann Villadiego, Inti A. Senthil, T. |
| author_sort | Chowdhury, Debanjan |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T08:12:33Z |
| format | Article |
| id | mit-1721.1/118845 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T08:12:33Z |
| publishDate | 2018 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | mit-1721.1/1188452022-09-23T11:38:41Z Mixed-valence insulators with neutral Fermi surfaces Chowdhury, Debanjan Sodemann Villadiego, Inti A. Senthil, T. Massachusetts Institute of Technology. Department of Physics Chowdhury, Debanjan Sodemann Villadiego, Inti A. Senthil, T. 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. Gordon and Betty Moore Foundation (Grant GBMF-4303) United States. Department of Energy (Grant DE-SC0008739) 2018-11-02T18:20:59Z 2018-11-02T18:20:59Z 2018-05 2018-01 2018-10-10T13:47:05Z Article http://purl.org/eprint/type/JournalArticle 2041-1723 http://hdl.handle.net/1721.1/118845 Chowdhury, Debanjan et al. “Mixed-Valence Insulators with Neutral Fermi Surfaces.” Nature Communications 9, 1 (May 2018): 1766 © 2018 The Author(s) https://orcid.org/0000-0002-1824-5167 http://dx.doi.org/10.1038/S41467-018-04163-2 Nature Communications Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf Nature Publishing Group Nature |
| spellingShingle | Chowdhury, Debanjan Sodemann Villadiego, Inti A. Senthil, T. Mixed-valence insulators with neutral Fermi surfaces |
| title | Mixed-valence insulators with neutral Fermi surfaces |
| title_full | Mixed-valence insulators with neutral Fermi surfaces |
| title_fullStr | Mixed-valence insulators with neutral Fermi surfaces |
| title_full_unstemmed | Mixed-valence insulators with neutral Fermi surfaces |
| title_short | Mixed-valence insulators with neutral Fermi surfaces |
| title_sort | mixed valence insulators with neutral fermi surfaces |
| url | http://hdl.handle.net/1721.1/118845 https://orcid.org/0000-0002-1824-5167 |
| work_keys_str_mv | AT chowdhurydebanjan mixedvalenceinsulatorswithneutralfermisurfaces AT sodemannvilladiegointia mixedvalenceinsulatorswithneutralfermisurfaces AT senthilt mixedvalenceinsulatorswithneutralfermisurfaces |