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Three-quarter Dirac points, Landau levels, and magnetization in α-(BEDT-TTF)2I3
http://hdl.handle.net/2298/38481
http://hdl.handle.net/2298/38481de86f318-a0c0-4016-8023-86a26117a63e
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
PhysRevB.96.085430.pdf (10.1 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2017-11-07 | |||||
| タイトル | ||||||
| タイトル | Three-quarter Dirac points, Landau levels, and magnetization in α-(BEDT-TTF)2I3 | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| 著者 |
Kishigi, Keita
× Kishigi, Keita× 長谷川, 泰正 |
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| 別言語の著者 |
岸木, 敬太
× 岸木, 敬太× 長谷川, 泰正 |
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| 内容記述 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | The energies as a function of the magnetic field (H) and the pressure are studied theoretically in the tight-binding model for the two-dimensional organic conductor α-(BEDT-TTF)2I3, in which massless Dirac fermions are realized. The effects of the uniaxial pressure (P) are studied by using the pressure-dependent hopping parameters. The system is semimetallic with the same area of an electron pocket and a hole pocket atP <3.0 kbar, where the energies (ε0D) at the Dirac points locate below the Fermi energy (ε0F) when H = 0. We find that at P = 2.3 kbar the Dirac cones are critically tilted. In that case a type of band crossing occurs at “three-quarter” Dirac points; i.e., the dispersion is quadratic in one direction and linear in the other three directions. We obtain magnetic field dependencies of the Landau levels (εn): εn − ε0D ∝ (nH)4/5 at P = 2.3 kbar (three-quarter Dirac points) and εn − ε0F ∝ (nH)2 at P = 3.0 kbar (the critical pressure for the semimetallic state). We also study the magnetization as a function of the inverse magnetic field. We obtain two types of quantum oscillations. One is the usual de Haas–van Alphen (dHvA) oscillation, and the other is the unusual dHvA-like oscillation which is seen even in the system without the Fermi surface. | |||||
| 書誌情報 |
Physical Review B 巻 96, p. 085430-1-085430-23, 発行年 2017-08-22 |
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| ISSN | ||||||
| 収録物識別子 | 24699950 | |||||
| DOI | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 関連識別子 | https://doi.org/10.1103/PhysRevB.96.085430 | |||||
| 権利 | ||||||
| 権利情報 | ©2017 American Physical Society | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 形態 | ||||||
| 値 | 10128238 bytes | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 428 | |||||
| 出版者 | ||||||
| 出版者 | American Physical Society | |||||
| 資源タイプ | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 論文(Article) | |||||
| 資源タイプ・ローカル | ||||||
| 値 | 雑誌掲載論文 | |||||
| 資源タイプ・NII | ||||||
| 値 | Journal Article | |||||
| 資源タイプ・DCMI | ||||||
| 値 | text | |||||
| 資源タイプ・ローカル表示コード | ||||||
| 値 | 01 | |||||
| URL | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.085430 | |||||
