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. Egdell; Robert J. Cava

doi:10.1021/jp502729u

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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34 Scopus citations

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 language	English (US)
Pages (from-to)	12333-12339
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	23
DOIs	https://doi.org/10.1021/jp502729u
State	Published - Jun 12 2014

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp502729u

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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

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title = "Observation of distinct bulk and surface chemical environments in a topological insulator under magnetic doping",

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.",

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

year = "2014",

month = jun,

day = "12",

doi = "10.1021/jp502729u",

language = "English (US)",

volume = "118",

pages = "12333--12339",

journal = "Journal of Physical Chemistry C",

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}

Vobornik, I, Panaccione, G, Fujii, J, Zhu, ZH, Offi, F, Salles, BR, Borgatti, F, Torelli, P, Rueff, JP, Ceolin, D, Artioli, A, Unnikrishnan, M, Levy, G, Marangolo, M, Eddrief, M, Krizmancic, D, Ji, H, Damascelli, A, Van Der Laan, G, Egdell, RG & Cava, RJ 2014, 'Observation of distinct bulk and surface chemical environments in a topological insulator under magnetic doping', Journal of Physical Chemistry C, vol. 118, no. 23, pp. 12333-12339. https://doi.org/10.1021/jp502729u

TY - JOUR

T1 - Observation of distinct bulk and surface chemical environments in a topological insulator under magnetic doping

AU - Vobornik, Ivana

AU - Panaccione, Giancarlo

AU - Fujii, Jun

AU - Zhu, Zhi Huai

AU - Offi, Francesco

AU - Salles, Benjamin R.

AU - Borgatti, Francesco

AU - Torelli, Piero

AU - Rueff, Jean Pascal

AU - Ceolin, Denis

AU - Artioli, Alberto

AU - Unnikrishnan, Manju

AU - Levy, Giorgio

AU - Marangolo, Massimiliano

AU - Eddrief, Mamhoud

AU - Krizmancic, Damjan

AU - Ji, Huiwen

AU - Damascelli, Andrea

AU - Van Der Laan, Gerrit

AU - Egdell, Russell G.

AU - Cava, Robert J.

PY - 2014/6/12

Y1 - 2014/6/12

N2 - 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.

AB - 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.

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DO - 10.1021/jp502729u

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SN - 1932-7447

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SP - 12333

EP - 12339

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 23

ER -

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

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All Science Journal Classification (ASJC) codes

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