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
言語種別 英語
発行・発表の年月 2011/10
形態種別 研究論文
標題 Optimizing Bi2-xSbxTe3-ySey solid solutions to approach the intrinsic topological insulator regime
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 84(16)
著者・共著者 Zhi Ren,A. A. Taskin,Satoshi Sasaki,Kouji Segawa,Yoichi Ando
概要 To optimize the bulk-insulating behavior in the topological insulator materials having a tetradymite structure, we have synthesized and have characterized single-crystal samples of Bi2-xSbxTe3-ySey solid solution at various compositions. We have elucidated that there are a series of intrinsic compositions where the acceptors and donors compensate each other and present a maximal bulk-insulating behavior. At such compositions, the resistivity can become as large as several Omega cm at low temperatures, and one can infer the role of the surface-transport channel in the nonlinear Hall effect. In particular, the composition of Bi1.5Sb0.5Te1.7Se1.3 achieves the lowest bulk carrier density and appears to be best suited for surface-transport studies.
DOI 10.1103/PhysRevB.84.165311
ISSN 1098-0121
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