Electronic structure of Fe1.08Te bulk crystals and epitaxial FeTe thin films on Bi2Te3

Fabian Arnold, Jonas Warmuth, Matteo Michiardi, Jan Fikáček, Marco Bianchi, Jin Hu, Zhiqiang Mao, Jill Miwa, Udai Raj Singh, Martin Bremholm, Roland Wiesendanger, Jan Honolka, Tim Wehling, Jens Wiebe, Philip Hofmann

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Abstract

The electronic structure of thin films of FeTe grown on Bi2Te3 is investigated using angle-resolved photoemission spectroscopy, scanning tunneling microscopy and first principles calculations. As a comparison, data from cleaved bulk Fe1.08Te taken under the same experimental conditions is also presented. Due to the substrate and thin film symmetry, FeTe thin films grow on Bi2Te3 in three domains, rotated by 0°, 120°, and 240°. This results in a superposition of photoemission intensity from the domains, complicating the analysis. However, by combining bulk and thin film data, it is possible to partly disentangle the contributions from three domains. We find a close similarity between thin film and bulk electronic structure and an overall good agreement with first principles calculations, assuming a p-doping shift of 65 meV for the bulk and a renormalization factor of around two. By tracking the change of substrate electronic structure upon film growth, we find indications of an electron transfer from the FeTe film to the substrate. No significant change of the film's electronic structure or doping is observed when alkali atoms are dosed onto the surface. This is ascribed to the film's high density of states at the Fermi energy. This behavior is also supported by the ab initio calculations.

Original languageEnglish (US)
Article number065502
JournalJournal of Physics Condensed Matter
Volume30
Issue number6
DOIs
StatePublished - Jan 12 2018

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Arnold, F., Warmuth, J., Michiardi, M., Fikáček, J., Bianchi, M., Hu, J., Mao, Z., Miwa, J., Raj Singh, U., Bremholm, M., Wiesendanger, R., Honolka, J., Wehling, T., Wiebe, J., & Hofmann, P. (2018). Electronic structure of Fe1.08Te bulk crystals and epitaxial FeTe thin films on Bi2Te3. Journal of Physics Condensed Matter, 30(6), [065502]. https://doi.org/10.1088/1361-648X/aaa43e