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Article
Spin-Orbit Interaction Effect in the Electronic Structure of Bi2Te3 Observed by Angle-Resolved Photoemission Spectroscopy
Europhysics Letters (2008)
  • H.J. Noh
  • H. Koh
  • S.J. Oh
  • J.H. Park, Pohang University of Science and Technology
  • H.D. Kim, Pohang University of Science and Technology
  • J.D. Rameau, Univerity of Northern Iowa
  • T. Valla
  • Timothy E. Kidd, University of Northern Iowa
  • P.D. Johnson, University of Northern Iowa
  • Y. Hu, University of Northern Iowa
Abstract
The electronic structure of p-type doped Bi2Te3 is studied by angle-resolved photoemission spectroscopy (ARPES) to experimentally confirm the mechanism responsible for the high thermoelectric figure of merit. Our ARPES study shows that the band edges are located off the Γ-Z line in the Brillouin zone, which provides direct observation that the spin-orbit interaction is a key factor to understand the electronic structure and the corresponding thermoelectric properties of Bi2Te3. A successive time-dependent ARPES measurement also reveals that the electron-like bands crossing EF near the -point are formed in an hour after cleaving the crystals. We interpret these as surface states induced by surface band bending, possibly due to quintuple inter-layer distance change of Bi2Te3.
Disciplines
Publication Date
February 12, 2008
Citation Information
H.J. Noh, H. Koh, S.J. Oh, J.H. Park, et al.. "Spin-Orbit Interaction Effect in the Electronic Structure of Bi2Te3 Observed by Angle-Resolved Photoemission Spectroscopy" Europhysics Letters Vol. 81 Iss. 57 (2008)
Available at: http://works.bepress.com/tim-kidd/24/