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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

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:
Report Number(s):
IS-J-9193
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1701319
Grant/Contract Number:
FG02-07ER46352; AC02-05CH11231; SC0012575; AC02-07CH11358
Type:
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)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1347898
Alternate Identifier(s):
OSTI ID: 1330293