Nuclear magnetic resonance study of a Bi2Te3 topological insulator

被引：9

作者：

Podorozhkin, D. Yu. ^{[1
]}

Charnaya, E. V. ^{[2
]}

Antonenko, A. ^{[2
]}

Mukhamad'yarov, R. ^{[2
]}

Marchenkov, V. V. ^{[3
,4
]}

Naumov, S. V. ^{[3
]}

Huang, J. C. A. ^{[5
]}

Weber, H. W. ^{[6
]}

Bugaev, A. S. ^{[7
]}

机构：

[1] St Petersburg State Univ, Ctr Diagnost Funct Mat Med Pharmacol & Nanoelect, St Petersburg 198504, Russia

[2] St Petersburg State Univ, St Petersburg 199034, Russia

[3] Russian Acad Sci, Ural Branch, Inst Met Phys, Ekaterinburg 620990, Russia

[4] Ural Fed Univ, Ekaterinburg 620002, Russia

[5] Natl Cheng Kung Univ, Tainan 701, Taiwan

[6] Vienna Univ Technol, Atominst Inst Atom & Subat Phys, A-1020 Vienna, Austria

[7] State Univ, Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Oblast, Russia

来源：

PHYSICS OF THE SOLID STATE | 2015年 / 57卷 / 09期

基金：

俄罗斯基础研究基金会;

关键词：

SINGLE DIRAC CONE; ELECTRONIC-STRUCTURE; SURFACE;

D O I：

10.1134/S1063783415090279

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The results of the nuclear magnetic resonance (NMR) study of a grown high-quality Bi2Te3 semiconductor single crystal have been presented. Signals from the Te-125 isotope were detected by the spin echo method in the range from 10 K to room temperature. It was found that the NMR spectrum consists of two lines. The line with a positive shift of the resonance frequency corresponded to the bulk of the sample. The line with a negative shift was interpreted as a signal from the surface of the single crystal. The temperature and orientational dependences of the positions of the NMR line of nuclei in the bulk of the crystal were studied. It was shown that the shifts are mainly determined by the Knight shift due to the interaction with mobile charge carriers. The thermoactivation character of the concentration of mobile charges in the crystal under study, which corresponds to the intrinsic conductance, was proved, and the energy parameters of the thermoactivation processes were calculated.

引用

页码：1741 / 1745

页数：5

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