Three-dimensional Fermi surface and electron-phonon coupling in semimetallic 1T- TiTe2 studied by angle-resolved photoemission spectroscopy

Xiao-Fang Tang, Yu-Xia Duan, Fan-Ying Wu, Shu-Yu Liu, Chen Zhang, Yin-Zou Zhao, Jiao-Jiao Song, Yang Luo, Qi-Yi Wu, Jun He, H. Y. Liu, Wen Xu, and Jian-Qiao Meng
Phys. Rev. B 99, 125112 – Published 11 March 2019
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Abstract

We present an investigation of the electronic structure of 1TTiTe2 single crystals using high-resolution angle-resolved photoemission spectroscopy utilizing tunable photon energy excitation. The typical semimetal-like electronic structure is observed and examined, where multiple hole pockets related to Te5p bands and one-electron pockets related to Ti 3d bands are populated by carriers. The obtained results reveal (i) a pronounced three-dimensional (3D) electronic band structure of 1TTiTe2 with typical semi-metallic features for both the Ti 3d and the Te5p states; (ii) multiple Fermi surface sheets and complex band structure; and (iii) an obvious kink in the dispersion at an energy of about 18 meV below the Fermi energy, which is an experimental observation of the kink structure in 1TTiTe2 single crystal. We find that this kink is induced by electron-phonon coupling in the material. These important and significant findings can help us to gain an in-depth understanding of the 3D electronic structure of semimetallic 1TTiTe2.

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  • Received 27 August 2018
  • Revised 20 February 2019
  • Corrected 8 April 2019

DOI:https://doi.org/10.1103/PhysRevB.99.125112

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Corrections

8 April 2019

Correction: Figure 2(b) was processed improperly during the initial production cycle and has been fixed.

Authors & Affiliations

Xiao-Fang Tang1,2,3, Yu-Xia Duan3, Fan-Ying Wu3, Shu-Yu Liu3, Chen Zhang3, Yin-Zou Zhao3, Jiao-Jiao Song3, Yang Luo3, Qi-Yi Wu3, Jun He3, H. Y. Liu4, Wen Xu1,5,*, and Jian-Qiao Meng3,6,†

  • 1Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
  • 2University of Science and Technology of China, Hefei 230026, People's Republic of China
  • 3School of Physics and Electronics, Central South University, Changsha 410083, Hunan, China
  • 4Beijing Academy of Quantum Information Sciences, Beijing 100085, China
  • 5School of Physics and Astronomy and Key Laboratory of Quantum Information of Yunnan Province, Yunnan University, Kunming 650091, China
  • 6Synergetic Innovation Center for Quantum Effects and Applications (SICQEA), Hunan Normal University, Changsha 410081, China

  • *Corresponding author: wenxu_issp@aliyun.com
  • Corresponding author: jqmeng@csu.edu.cn

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Issue

Vol. 99, Iss. 12 — 15 March 2019

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