TY - JOUR
T1 - Electron spin resonance study of proton-irradiated topological insulator Bi2Se3 nanoparticles
AU - Lee, Yeo Jin
AU - Lee, Kyu Won
AU - Choi, Dong Min
AU - Park, Won Koo
AU - Lee, Cheol Eui
N1 - 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.
PY - 2021/3
Y1 - 2021/3
N2 - 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.
AB - 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.
KW - Electron spin resonance
KW - Hydrogen doping
KW - Proton irradiation
KW - Topological insulator BiSe nanoparticles
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U2 - 10.1016/j.physe.2020.114528
DO - 10.1016/j.physe.2020.114528
M3 - Article
AN - SCOPUS:85097330268
VL - 127
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
SN - 1386-9477
M1 - 114528
ER -