Ambient-Pressure Organic Dirac Electron State in $α$-(BETS)$_2$AuCl$_2$
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917387379408896 |
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| author | Kobayashi, Takuya Yoshimi, Kazuyoshi Nishimoto, Aoto Michimura, Shinji Taniguchi, Hiromi |
| author_facet | Kobayashi, Takuya Yoshimi, Kazuyoshi Nishimoto, Aoto Michimura, Shinji Taniguchi, Hiromi |
| contents | We report an ambient-pressure Dirac electron (DE) state in a new organic conductor, $α$-(BETS)$_2$AuCl$_2$ (BETS = bis(ethylenedithio)tetraselenafulvalene). This salt exhibits characteristic transport properties, including large positive in-plane and anomalous negative interlayer magnetoresistance. These signatures closely resemble the high-pressure DE states of $α$-(ET)$_2$I$_3$ (ET = bis(ethylenedithio)tetrathiafulvalene). First-principles calculations including spin-orbit coupling identify the electronic state as a quasi-three-dimensional massive Dirac semimetal with residual Fermi pockets. This discovery provides a valuable platform for exploring bulk Dirac fermions without the complexity of high-pressure measurements. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_21398 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ambient-Pressure Organic Dirac Electron State in $α$-(BETS)$_2$AuCl$_2$ Kobayashi, Takuya Yoshimi, Kazuyoshi Nishimoto, Aoto Michimura, Shinji Taniguchi, Hiromi Materials Science Strongly Correlated Electrons We report an ambient-pressure Dirac electron (DE) state in a new organic conductor, $α$-(BETS)$_2$AuCl$_2$ (BETS = bis(ethylenedithio)tetraselenafulvalene). This salt exhibits characteristic transport properties, including large positive in-plane and anomalous negative interlayer magnetoresistance. These signatures closely resemble the high-pressure DE states of $α$-(ET)$_2$I$_3$ (ET = bis(ethylenedithio)tetrathiafulvalene). First-principles calculations including spin-orbit coupling identify the electronic state as a quasi-three-dimensional massive Dirac semimetal with residual Fermi pockets. This discovery provides a valuable platform for exploring bulk Dirac fermions without the complexity of high-pressure measurements. |
| title | Ambient-Pressure Organic Dirac Electron State in $α$-(BETS)$_2$AuCl$_2$ |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2602.21398 |