Observation of distinct bulk and surface chemical environments in a topological insulator under magnetic doping

Ivana Vobornik, Giancarlo Panaccione, Jun Fujii, Zhi Huai Zhu, Francesco Offi, Benjamin R. Salles, Francesco Borgatti, Piero Torelli, Jean Pascal Rueff, Denis Ceolin, Alberto Artioli, Manju Unnikrishnan, Giorgio Levy, Massimiliano Marangolo, Mamhoud Eddrief, Damjan Krizmancic, Huiwen Ji, Andrea Damascelli, Gerrit Van Der Laan, Russell G. EgdellRobert J. Cava

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Abstract

The influence of magnetic dopants on the electronic and chemical environments in topological insulators (TIs) is a key factor when considering possible spintronic applications based on topological surface state properties. Here we provide spectroscopic evidence for the presence of distinct chemical and electronic behavior for surface and bulk magnetic doping of Bi 2Te3. The inclusion of Mn in the bulk of Bi 2Te3 induces a genuine dilute ferromagnetic state, with reduction of the bulk band gap as the Mn content is increased. Deposition of Fe on the Bi2Te3 surface, on the other hand, favors the formation of iron telluride already at coverages as low as 0.07 monolayer, as a consequence of the reactivity of the Te-rich surface. Our results identify the factors that need to be controlled in the realization of magnetic nanosystems and interfaces based on TIs.

Original languageEnglish (US)
Pages (from-to)12333-12339
Number of pages7
JournalJournal of Physical Chemistry C
Volume118
Issue number23
DOIs
StatePublished - Jun 12 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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    Vobornik, I., Panaccione, G., Fujii, J., Zhu, Z. H., Offi, F., Salles, B. R., Borgatti, F., Torelli, P., Rueff, J. P., Ceolin, D., Artioli, A., Unnikrishnan, M., Levy, G., Marangolo, M., Eddrief, M., Krizmancic, D., Ji, H., Damascelli, A., Van Der Laan, G., ... Cava, R. J. (2014). Observation of distinct bulk and surface chemical environments in a topological insulator under magnetic doping. Journal of Physical Chemistry C, 118(23), 12333-12339. https://doi.org/10.1021/jp502729u