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

Ärrälä, Minna; Hafiz, Hasnain; Mou, Daixiang; Wu, Yun; Jiang, Rui; Riedemann, Trevor; Lograsso, Thomas A.; Barbiellini, Bernardo; Kaminski, Adam; Bansil, Arun; Lindroos, Matti

doi:10.1103/PhysRevB.94.155144

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 Bi₂Te₃ topological insulator

Journal Article · Thu Oct 27 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.155144· OSTI ID:1347898

Ärrälä, Minna ^[1]; Hafiz, Hasnain ^[2]; Mou, Daixiang ^[3]; Wu, Yun ^[3]; Jiang, Rui ^[3]; Riedemann, Trevor ^[4]; Lograsso, Thomas A. ^[5]; Barbiellini, Bernardo ^[2]; Kaminski, Adam ^[3]; Bansil, Arun ^[2]; Lindroos, Matti ^[6]

Tampere Univ. of Technology (Finland). Inst. of Physics
Northeastern Univ., Boston, MA (United States). Dept. of Physics
Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Ames Lab., Ames, IA (United States). Materials Science and Engineering Division
Ames Lab., Ames, IA (United States). Materials Science and Engineering Division
Ames Lab., Ames, IA (United States). Materials Science and Engineering Division; Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering
Tampere Univ. of Technology (Finland). Inst. of Physics; Northeastern Univ., Boston, MA (United States). Dept. of Physics

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 k_z dispersion and the presence of delicate gaps in the final state electronic spectrum.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for the Computational Design of Functional Layered Materials (CCDM)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-07ER46352; AC02-05CH11231; SC0012575; AC02-07CH11358

OSTI ID:: 1347898

Alternate ID(s):: OSTI ID: 1330293

Report Number(s):: IS-J-9193; PRBMDO; TRN: US1701319

Journal Information:: Physical Review B, Vol. 94, Issue 15; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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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

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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 Bi₂Te₃ topological insulator