Topological phase transition of Bi2–xInxTe3

Q. Jing; W. X. Jiang; Z. Q. Yang; J. F. Wang; M. Y. Yao; F. F. Zhu; Y. L. Li; S. B. Li; J. Y. Hu; C. H. Xu; B. Liu; D. Qian

doi:10.1209/0295-5075/128/37001

All issues

Volume 128 / No 3 (November 2019)

EPL, 128 3 (2019) 37001

Abstract

Issue		EPL Volume 128, Number 3, November 2019


Article Number		37001
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/128/37001
Published online		10 January 2020

EPL, 128 (2019) 37001

Topological phase transition of Bi_2–xIn_xTe₃

Q. Jing¹^,2, W. X. Jiang¹^,3, Z. Q. Yang¹^,3, J. F. Wang², M. Y. Yao¹^,3, F. F. Zhu¹^,3, Y. L. Li¹^,3, S. B. Li¹^,3, J. Y. Hu¹^,3, C. H. Xu¹^,3, B. Liu² and D. Qian¹^,3^(a)

¹ Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University - Shanghai 200240, China
² Laboratory of Functional Molecules and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology - 266 Xincun Xi Road, Zibo, 255000, China
³ Tsung-Dao Lee Institute, Shanghai Jiao Tong University - Shanghai 200240, China

^(a) dqian@sjtu.edu.cn

Received: 30 August 2019
Accepted: 15 November 2019

Abstract

Compared with Bi₂Se₃ with its Dirac point in the bulk gap, the Dirac point of Bi₂Te₃ is in the valence band, then it is generally considered that it is difficult to observe the topological phase transition course in the Bi₂Te₃ system via nonmagnetic lighter element doping. Here, we report the phase transition of Bi_2–xIn_xTe₃, from a topological insulator to a trivial band insulator observed by angle-resolved photoemission spectroscopy. The robust surface state exists in the range of $x \sim 0.1$ . At $x =0.3$ , the surface state completely disappears and only the bulk gap exists, suggesting a sudden gap closure and topological phase transition around $x=0.1\text{--}0.3$ .

PACS: 79.60.-i – Photoemission and photoelectron spectra / 73.20.-r – Electron states at surfaces and interfaces / 73.20.At – Surface states, band structure, electron density of states

© EPLA, 2020

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