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セガワ コウジ
SEGAWA KOJI
瀬川 耕司 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2011/08 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Observations of two-dimensional quantum oscillations and ambipolar transport in the topological insulator Bi2Se3 achieved by Cd doping |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICAL REVIEW B |
| 掲載区分 | 国外 |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 巻・号・頁 | 84(7) |
| 著者・共著者 | Zhi Ren,A. A. Taskin,Satoshi Sasaki,Kouji Segawa,Yoichi Ando |
| 概要 | We present a defect-engineering strategy to optimize the transport properties of the topological insulator Bi2Se3 to show a high bulk resistivity and clear quantum oscillations. Starting with a p-type Bi2Se3 obtained by combining Cd doping and a Se-rich crystal-growth condition, we were able to observe a p-to-n-type conversion upon gradually increasing the Se vacancies by post annealing. With the optimal annealing condition, where a high level of compensation is achieved, the resistivity exceeds 0.5 Omega cm at 1.8 K and we observed two-dimensional Shubnikov-de Haas oscillations composed of multiple frequencies in magnetic fields below 14 T. |
| DOI | 10.1103/PhysRevB.84.075316 |
| ISSN | 1098-0121 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=80052447095&origin=inward |