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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 | 2011/11 |
| 形態種別 | 研究論文 |
| 標題 | Topological Superconductivity in CuxBi2Se3 |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICAL REVIEW LETTERS |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 巻・号・頁 | 107(21) |
| 著者・共著者 | Satoshi Sasaki,M. Kriener,Kouji Segawa,Keiji Yada,Yukio Tanaka,Masatoshi Sato,Yoichi Ando |
| 概要 | A topological superconductor (TSC) is characterized by the topologically protected gapless surface state that is essentially an Andreev bound state consisting of Majorana fermions. While a TSC has not yet been discovered, the doped topological insulator CuxBi2Se3, which superconducts below similar to 3 K, has been predicted to possess a topological superconducting state. We report that the point-contact spectra on the cleaved surface of superconducting CuxBi2Se3 present a zero-bias conductance peak (ZBCP) which signifies unconventional superconductivity. Theoretical considerations of all possible superconducting states help us conclude that this ZBCP is due to Majorana fermions and gives evidence for a topological superconductivity in CuxBi2Se3. In addition, we found an unusual pseudogap that develops below similar to 20 K and coexists with the topological superconducting state. |
| DOI | 10.1103/PhysRevLett.107.217001 |
| ISSN | 0031-9007 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=81155123600&origin=inward |