Electron-phonon coupling and surface Debye temperature of Bi2Te3(111) from helium atom scattering

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  • Anton Tamtogl, Graz University of Technology
  • ,
  • Patrick Kraus, Graz University of Technology
  • ,
  • Nadav Avidor, Cambridge University
  • ,
  • Martin Bremholm
  • Ellen M. J. Hedegaard
  • ,
  • Bo B. Iversen
  • Marco Bianchi
  • Philip Hofmann
  • John Ellis, Cambridge University
  • ,
  • William Allison, Cambridge University
  • ,
  • Giorgio Benedek, Univ Basque Country, University of Basque Country
  • ,
  • Wolfgang E. Ernst, Graz University of Technology

We have studied the topological insulator Bi2Te3(111) by means of helium atom scattering. The average electron-phonon coupling lambda of Bi2Te3(111) is determined by adapting a recently developed quantum-theoretical derivation of the helium scattering probabilities to the case of degenerate semiconductors. Based on the Debye-Waller attenuation of the elastic diffraction peaks of Bi2Te3(111), measured at surface temperatures between 110 and 355 K, we find lambda to be in the range of 0.04-0.11. This method allows us to extract a correctly averaged. and to address the discrepancy between previous studies. The relatively modest value of. is not surprising even though some individual phonons may provide a larger electron-phonon interaction. Furthermore, the surface Debye temperature of Bi2Te3(111) is determined as Theta(D) = (81 +/- 6) K. The electronic surface corrugation was analyzed based on close-coupling calculations. By using a corrugated Morse potential a peak-to-peak corrugation of 9% of the lattice constant is obtained.

OriginalsprogEngelsk
Artikelnummer195401
TidsskriftPhysical Review B
Vol/bind95
Nummer19
Antal sider9
ISSN2469-9950
DOI
StatusUdgivet - 4 maj 2017

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