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Title: Laser angle-resolved photoemission as a probe of initial state k z dispersion, final-state band gaps, and spin texture of Dirac states in the Bi 2Te 3 topological insulator

Abstract

Here, we have obtained angle-resolved photoemission (ARPES) spectra from single crystals of the topological insulator material Bi 2Te 3 using tunable laser spectrometer. The spectra were collected for eleven different photon energies ranging from 5.57 to 6.70 eV for incident light polarized linearly along two different in-plane directions. Parallel first-principles, fully relativistic computations of photo-intensities were carried out using the experimental geometry within the framework of the one-step model of photoemission. Good overall accord between theory and experiment is used to gain insight into how properties of the initial and final state band structures as well as those of the topological surface states and their spin-textures are reflected in the laser-ARPES spectra. In conclusion, our analysis reveals that laser-ARPES is sensitive to both the initial state k z dispersion and the presence of delicate gaps in the final state electronic spectrum.

Authors:
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [2];  [3];  [2];  [6]
  1. Tampere Univ. of Technology (Finland). Inst. of Physics
  2. Northeastern Univ., Boston, MA (United States). Dept. of Physics
  3. Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Ames Lab., Ames, IA (United States). Materials Science and Engineering Division
  4. Ames Lab., Ames, IA (United States). Materials Science and Engineering Division
  5. Ames Lab., Ames, IA (United States). Materials Science and Engineering Division; Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering
  6. Tampere Univ. of Technology (Finland). Inst. of Physics; Northeastern Univ., Boston, MA (United States). Dept. of Physics
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1347898
Alternate Identifier(s):
OSTI ID: 1330293
Report Number(s):
IS-J-9193
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1701319
Grant/Contract Number:  
FG02-07ER46352; AC02-05CH11231; SC0012575; AC02-07CH11358
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 15; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Ärrälä, Minna, Hafiz, Hasnain, Mou, Daixiang, Wu, Yun, Jiang, Rui, Riedemann, Trevor, Lograsso, Thomas A., Barbiellini, Bernardo, Kaminski, Adam, Bansil, Arun, and Lindroos, Matti. Laser angle-resolved photoemission as a probe of initial state kz dispersion, final-state band gaps, and spin texture of Dirac states in the Bi2Te3 topological insulator. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.155144.
Ärrälä, Minna, Hafiz, Hasnain, Mou, Daixiang, Wu, Yun, Jiang, Rui, Riedemann, Trevor, Lograsso, Thomas A., Barbiellini, Bernardo, Kaminski, Adam, Bansil, Arun, & Lindroos, Matti. Laser angle-resolved photoemission as a probe of initial state kz dispersion, final-state band gaps, and spin texture of Dirac states in the Bi2Te3 topological insulator. United States. doi:10.1103/PhysRevB.94.155144.
Ärrälä, Minna, Hafiz, Hasnain, Mou, Daixiang, Wu, Yun, Jiang, Rui, Riedemann, Trevor, Lograsso, Thomas A., Barbiellini, Bernardo, Kaminski, Adam, Bansil, Arun, and Lindroos, Matti. Thu . "Laser angle-resolved photoemission as a probe of initial state kz dispersion, final-state band gaps, and spin texture of Dirac states in the Bi2Te3 topological insulator". United States. doi:10.1103/PhysRevB.94.155144. https://www.osti.gov/servlets/purl/1347898.
@article{osti_1347898,
title = {Laser angle-resolved photoemission as a probe of initial state kz dispersion, final-state band gaps, and spin texture of Dirac states in the Bi2Te3 topological insulator},
author = {Ärrälä, Minna and Hafiz, Hasnain and Mou, Daixiang and Wu, Yun and Jiang, Rui and Riedemann, Trevor and Lograsso, Thomas A. and Barbiellini, Bernardo and Kaminski, Adam and Bansil, Arun and Lindroos, Matti},
abstractNote = {Here, we have obtained angle-resolved photoemission (ARPES) spectra from single crystals of the topological insulator material Bi2Te3 using tunable laser spectrometer. The spectra were collected for eleven different photon energies ranging from 5.57 to 6.70 eV for incident light polarized linearly along two different in-plane directions. Parallel first-principles, fully relativistic computations of photo-intensities were carried out using the experimental geometry within the framework of the one-step model of photoemission. Good overall accord between theory and experiment is used to gain insight into how properties of the initial and final state band structures as well as those of the topological surface states and their spin-textures are reflected in the laser-ARPES spectra. In conclusion, our analysis reveals that laser-ARPES is sensitive to both the initial state kz dispersion and the presence of delicate gaps in the final state electronic spectrum.},
doi = {10.1103/PhysRevB.94.155144},
journal = {Physical Review B},
number = 15,
volume = 94,
place = {United States},
year = {Thu Oct 27 00:00:00 EDT 2016},
month = {Thu Oct 27 00:00:00 EDT 2016}
}

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Works referenced in this record:

Colloquium: Topological insulators
journal, November 2010


Topological Insulator Materials
journal, October 2013

  • Ando, Yoichi
  • Journal of the Physical Society of Japan, Vol. 82, Issue 10, Article No. 102001
  • DOI: 10.7566/JPSJ.82.102001