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 language | English |
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Article number | 114528 |
Journal | Physica E: Low-Dimensional Systems and Nanostructures |
Volume | 127 |
DOIs | |
Publication status | Published - 2021 Mar |
Bibliographical note
Funding Information:This work was supported by the National Research Foundation of Korea (Project Nos. 2019R1A2C1002076 and 2019S1A5A2A03050121 ). The Korea Basic Science Institute (KBSI) is acknowledged for the measurements.
Funding Information:
This work was supported by the National Research Foundation of Korea (Project Nos. 2019R1A2C1002076 and 2019S1A5A2A03050121). The Korea Basic Science Institute (KBSI) is acknowledged for the measurements.
Publisher Copyright:
© 2020 Elsevier B.V.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
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