論文

2023年1月11日

Semiconductor–metal transition in Bi2Se3 caused by impurity doping

Scientific Reports
  • Takaki Uchiyama
  • Hidenori Goto
  • Eri Uesugi
  • Akihisa Takai
  • Lei Zhi
  • Akari Miura
  • Shino Hamao
  • Ritsuko Eguchi
  • Hiromi Ota
  • Kunihisa Sugimoto
  • Akihiko Fujiwara
  • Fumihiko Matsui
  • Koji Kimura
  • Kouichi Hayashi
  • Teppei Ueno
  • Kaya Kobayashi
  • Jun Akimitsu
  • Yoshihiro Kubozono
  • 全て表示

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記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/s41598-023-27701-5
出版者・発行元
Springer Science and Business Media LLC

Abstract

Doping a typical topological insulator, Bi2Se3, with Ag impurity causes a semiconductor–metal (S-M) transition at 35 K. To deepen the understanding of this phenomenon, structural and transport properties of Ag-doped Bi2Se3 were studied. Single-crystal X-ray diffraction (SC-XRD) showed no structural transitions but slight shrinkage of the lattice, indicating no structural origin of the transition. To better understand electronic properties of Ag-doped Bi2Se3, extended analyses of Hall effect and electric-field effect were carried out. Hall effect measurements revealed that the reduction of resistance was accompanied by increases in not only carrier density but carrier mobility. The field-effect mobility is different for positive and negative gate voltages, indicating that the EF is located at around the bottom of the bulk conduction band (BCB) and that the carrier mobility in the bulk is larger than that at the bottom surface at all temperatures. The pinning of the EF at the BCB is found to be a key issue to induce the S-M transition, because the transition can be caused by depinning of the EF or the crossover between the bulk and the top surface transport.

リンク情報
DOI
https://doi.org/10.1038/s41598-023-27701-5
URL
https://www.nature.com/articles/s41598-023-27701-5.pdf
URL
https://www.nature.com/articles/s41598-023-27701-5
ID情報
  • DOI : 10.1038/s41598-023-27701-5
  • eISSN : 2045-2322

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