WEKO3
アイテム
de Haas–van Alphen oscillations near the Lifshitz transition from two electron pockets to one in the two-dimensional Dirac fermion systems
http://hdl.handle.net/2298/00044881
http://hdl.handle.net/2298/000448813feba4ea-c4b7-4442-a692-91ac65d35beb
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
PhysRevB.104.085412 (2.3 MB)
|
|
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2022-01-18 | |||||
| タイトル | ||||||
| タイトル | de Haas–van Alphen oscillations near the Lifshitz transition from two electron pockets to one in the two-dimensional Dirac fermion systems | |||||
| 言語 | en | |||||
| 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 |
岸木, 敬太
× 岸木, 敬太× 長谷川, 泰正 |
|||||
| 別言語の著者 |
Kishigi, Keita
× Kishigi, Keita× 長谷川, 泰正 |
|||||
| 内容記述 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | We theoretically study the de Haas-van Alphen (dHvA) oscillations in the system with changing the topology of the Fermi surface (the Lifshitz transition) by electron dopings. We employ the two-dimensional tight-binding model for α-(BEDT-TTF)2I3 under pressure which has two Dirac points in the first Brillouin zone. When this system is slightly doped, there exists two closed Fermi surfaces with the same area and the dHvA oscillations become saw-ooth pattern or inversed sawtooth pattern for both cases of fixed electron filling (ν) or fixed chemical potential (μ) with respect to the magnetic field, respectively. By increasing dopings, the system approaches the Lifshitz transition where two closed Fermi surfaces are close each other. Then, we find that the pattern of the dHvA oscillations changes. A jump of the magnetization appears at the center of the fundamental period, and its magnitude increases in the case of the fixed electron filling, whereas a jump is separated into a pair of jumps and its separation becomes large in the case of the fixed chemical potential. This is due to the lifting of double degeneracy in the Landau levels. Since this lifting is seen in the two-dimensional Dirac fermion system with two Dirac points, the obtained results in this paper can be applied to not only α-(BEDT-TTF)2I3, but also other materials with closely located Dirac points, such as graphene under the uniaxial strain, in black phosphorus, twisted bilayer graphene, and so on. | |||||
| 書誌情報 |
PHYSICAL REVIEW B 巻 104, 号 8, p. 085412-1-085412-14, 発行年 2021-08-10 |
|||||
| ISSN | ||||||
| 収録物識別子 | 2469-9950 | |||||
| DOI | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 関連識別子 | https://doi.org/10.1103/PhysRevB.104.085412 | |||||
| 権利 | ||||||
| 権利情報 | (C) 2021 American Physical Society | |||||
| 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 | |||||
