Fermi level tuning of Ag-doped Bi 2 Se 3 topological insulator

Eri Uesugi, Takaki Uchiyama, Hidenori Goto, Hiromi Ota, Teppei Ueno, Hirokazu Fujiwara, Kensei Terashima, Takayoshi Yokoya, Fumihiko Matsui, Jun Akimitsu, Kaya Kobayashi, Yoshihiro Kubozono

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Abstract

The temperature dependence of the resistivity (ρ) of Ag-doped Bi 2 Se 3 (Ag x Bi 2−x Se 3 ) shows insulating behavior above 35 K, but below 35 K, ρ suddenly decreases with decreasing temperature, in contrast to the metallic behavior for non-doped Bi 2 Se 3 at 1.5–300 K. This significant change in transport properties from metallic behavior clearly shows that the Ag doping of Bi 2 Se 3 can effectively tune the Fermi level downward. The Hall effect measurement shows that carrier is still electron in Ag x Bi 2−x Se 3 and the electron density changes with temperature to reasonably explain the transport properties. Furthermore, the positive gating of Ag x Bi 2−x Se 3 provides metallic behavior that is similar to that of non-doped Bi 2 Se 3 , indicating a successful upward tuning of the Fermi level.

Original languageEnglish
Article number5376
Pages (from-to)5376
JournalScientific reports
Volume9
Issue number1
DOIs
Publication statusPublished - Mar 29 2019

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