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Observation of Infrared-Active Modes in Raman Scattering from Topological Insulator Nanoplates
Nanotechnology (2012)
  • Rui He, University of Northern Iowa
  • Zhenhua Wang, Case Western Reserve University
  • Richard L.J. Qiu, Case Western Reserve University
  • Conor Delaney, University of Northern Iowa
  • Benjamin Beck, University of Northern Iowa
  • Tim Kidd, University of Northern Iowa
  • C. C. Chancey, University of Northern Iowa
  • Xuan P.A. Gao, Case Western Reserve University
Two infrared (IR)-active vibrational modes, observed at 93 and 113 cm−1 in Raman scattering, are evidence of an inversion symmetry breakdown in thin (~10 nm) nanoplates of topological insulator Bi2Te3 as-grown on SiO2. Both Raman and IR modes are preserved after typical device fabrication processes. In nanoplates transferred to another SiO2substrate via contact printing, however, the IR modes are absent, and the Raman spectra are similar to those from bulk samples. The differences between as-grown and transferred nanoplates may result from nanoplate–substrate interactions.
Publication Date
October 12, 2012
Citation Information
Rui He, Zhenhua Wang, Richard L.J. Qiu, Conor Delaney, et al.. "Observation of Infrared-Active Modes in Raman Scattering from Topological Insulator Nanoplates" Nanotechnology Vol. 23 Iss. 45 (2012)
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