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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 | 2015/09 |
| 形態種別 | 研究論文 |
| 標題 | Observation of two-dimensional bulk electronic states in the superconducting topological insulator heterostructure Cu-x(PbSe)(5)(Bi2Se3)(6): Implications for unconventional superconductivity |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICAL REVIEW B |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 巻・号・頁 | 92(10) |
| 著者・共著者 | K. Nakayama,H. Kimizuka,Y. Tanaka,T. Sato,S. Souma,T. Takahashi,Satoshi Sasaki,Kouji Segawa,Yoichi Ando |
| 概要 | We have performed angle-resolved photoemission spectroscopy (ARPES) on Cu-x(PbSe)(5)(Bi2Se3)(6) [(CPSBS); x = 1.47], a superconductor derived from a topological insulator heterostructure, to elucidate the electronic states relevant to the occurrence of possible unconventional superconductivity. Upon Cu intercalation into the parent compound (PbSe)(5)(Bi2Se3)(6), we observed a distinct energy shift of the bulk conduction band due to electron doping. Photon-energy-dependent ARPES measurements of CPSBS revealed that the observed bulk band forms a cylindrical electronlike Fermi surface at the Brillouin-zone center. The two-dimensional nature of the bulk electronic states puts strong constraints on the possible topological character of the superconducting state in CPSBS. |
| DOI | 10.1103/PhysRevB.92.100508 |
| ISSN | 1098-0121/1550-235X |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84943756039&origin=inward |