{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/gap-opening-mechanism-for-correlated-dirac","title":"Gap opening mechanism for correlated Dirac electrons in organic compounds $α$-(BEDT-TTF)$_2$I$_3$ and $α$-(BEDT-TSeF)$_2$I$_3$","arxiv_id":"2209.13460","date":"2022-09-27","proceeding":null,"authors":["Daigo Ohki","Kazuyoshi Yoshimi","Akito Kobayashi","Takahiro Misawa"],"abstract":"To determine how electron correlations open a gap in two-dimensional massless Dirac electrons in the organic compounds $\\alpha$-(BEDT-TTF)$_2$I$_3$ [$\\alpha$-(ET)$_2$I$_3$] and $\\alpha$-(BEDT-TSeF)$_2$I$_3$ [$\\alpha$-(BETS)$_2$I$_3$], we derive and analyze $ab$ $initio$ low-energy effective Hamiltonians for these two compounds. We find that the horizontal stripe charge ordering opens a gap in the massless Dirac electrons in $\\alpha$-(ET)$_2$I$_3$, while an insulating phase without explicit symmetry breaking appears in $\\alpha$-(BETS)$_2$I$_3$. We clarify that the combination of the anisotropic transfer integrals and the electron correlations induces a dimensional reduction in the spin correlations, i.e., one-dimensional spin correlations develop in $\\alpha$-(BETS)$_2$I$_3$. We show that the one-dimensional spin correlations open a gap in the massless Dirac electrons. Our finding paves the way for opening gaps for massless Dirac electrons using strong electronic correlations.","url_abs":"https://arxiv.org/abs/2209.13460v4","url_pdf":"https://arxiv.org/pdf/2209.13460v4.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"gap-opening-mechanism-for-correlated-dirac","repo_url":"https://isspns-gitlab.issp.u-tokyo.ac.jp/k-yoshimi/alpha-salts","is_official":1,"mentioned_in_paper":0,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}