Electron spin resonance study of proton-irradiated topological insulator Bi2Se3 nanoparticles

Yeo Jin Lee, Kyu Won Lee, Dong Min Choi, Won Koo Park, Cheol Eui Lee

Research output: Contribution to journalArticlepeer-review

Abstract

We have studied the proton-irradiation effects on the topological insulator Bi2Se3 nanoparticles by means of electron spin resonance (ESR) measurements. The ESR signals from the hydrogen-doped Bi2Se3 nanoparticles, ascribed to the metallic surface of the topological insulator, were enhanced at high enough proton irradiation doses, which was explained by the enhanced surface effect. Our density functional theory calculations indicated that the hydrogen defects act as donors whose transition levels are in the conduction band. Thus, weak potential fluctuations are taken to be responsible for the small activation energy of ~5 meV, obtained from the temperature-dependent ESR intensity.

Original languageEnglish
Article number114528
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume127
DOIs
Publication statusPublished - 2021 Mar

Keywords

  • Electron spin resonance
  • Hydrogen doping
  • Proton irradiation
  • Topological insulator BiSe nanoparticles

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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