Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3

J. Sanchez-Barriga; Andrei Varykhalov; Gunther Springholz; Hubert Steiner; Raimund Kirchschlager; Günther Bauer; O. Caha; E. Schierle; E. Weschke; A. A. Ünal; S. Valencia; M. Dunst; J. Braun; H. Ebert; J. Minar; E. Golias; Lada V. Yashina; Andreas Ney; Vaclav Holy; O. Rader

doi:10.1038/ncomms10559

Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3

J. Sanchez-Barriga, Andrei Varykhalov, Gunther Springholz, Hubert Steiner, Raimund Kirchschlager, Günther Bauer, O. Caha, E. Schierle, E. Weschke, A. A. Ünal, S. Valencia, M. Dunst, J. Braun, H. Ebert, J. Minar, E. Golias, Lada V. Yashina, Andreas Ney, Vaclav Holy, O. Rader

Research output: Contribution to journal › Article › peer-review

Abstract

Magnetic doping is expected to open a band gap at the Dirac point of topological insulators by breaking time-reversal symmetry and to enable novel topological phases. Epitaxial (Bi1−xMnx)2Se3 is a prototypical magnetic topological insulator with a pronounced surface band gap of ~100 meV. We show that this gap is neither due to ferromagnetic order in the bulk or at the surface nor to the local magnetic moment of the Mn, making the system unsuitable for realizing the novel phases. We further show that Mn doping does not affect the inverted bulk band gap and the system remains topologically nontrivial. We suggest that strong resonant scattering processes cause the gap at the Dirac point and support this by the observation of in-gap states using resonant photoemission. Our findings establish a mechanism for gap opening in topological surface states which challenges the currently known conditions for topological protection.

Original language	English
Article number	10559
Pages (from-to)	10559
Number of pages	10
Journal	nature communications
Volume	7
DOIs	https://doi.org/10.1038/ncomms10559
Publication status	Published - Feb 2016

Fields of science

103 Physics, Astronomy

JKU Focus areas

Nano-, Bio- and Polymer-Systems: From Structure to Function

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Sanchez-Barriga, J., Varykhalov, A., Springholz, G., Steiner, H., Kirchschlager, R., Bauer, G., Caha, O., Schierle, E., Weschke, E., Ünal, A. A., Valencia, S., Dunst, M., Braun, J., Ebert, H., Minar, J., Golias, E., Yashina, L. V., Ney, A., Holy, V., & Rader, O. (2016). Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3. nature communications, 7, 10559. Article 10559. https://doi.org/10.1038/ncomms10559

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title = "Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3",

abstract = "Magnetic doping is expected to open a band gap at the Dirac point of topological insulators by breaking time-reversal symmetry and to enable novel topological phases. Epitaxial (Bi1−xMnx)2Se3 is a prototypical magnetic topological insulator with a pronounced surface band gap of ~100 meV. We show that this gap is neither due to ferromagnetic order in the bulk or at the surface nor to the local magnetic moment of the Mn, making the system unsuitable for realizing the novel phases. We further show that Mn doping does not affect the inverted bulk band gap and the system remains topologically nontrivial. We suggest that strong resonant scattering processes cause the gap at the Dirac point and support this by the observation of in-gap states using resonant photoemission. Our findings establish a mechanism for gap opening in topological surface states which challenges the currently known conditions for topological protection.",

author = "J. Sanchez-Barriga and Andrei Varykhalov and Gunther Springholz and Hubert Steiner and Raimund Kirchschlager and G{\"u}nther Bauer and O. Caha and E. Schierle and E. Weschke and {\"U}nal, {A. A.} and S. Valencia and M. Dunst and J. Braun and H. Ebert and J. Minar and E. Golias and Yashina, {Lada V.} and Andreas Ney and Vaclav Holy and O. Rader",

year = "2016",

month = feb,

doi = "10.1038/ncomms10559",

language = "English",

volume = "7",

pages = "10559",

journal = "nature communications",

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Sanchez-Barriga, J, Varykhalov, A, Springholz, G, Steiner, H, Kirchschlager, R, Bauer, G, Caha, O, Schierle, E, Weschke, E, Ünal, AA, Valencia, S, Dunst, M, Braun, J, Ebert, H, Minar, J, Golias, E, Yashina, LV, Ney, A, Holy, V & Rader, O 2016, 'Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3', nature communications, vol. 7, 10559, pp. 10559. https://doi.org/10.1038/ncomms10559

TY - JOUR

T1 - Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3

AU - Sanchez-Barriga, J.

AU - Varykhalov, Andrei

AU - Springholz, Gunther

AU - Steiner, Hubert

AU - Kirchschlager, Raimund

AU - Bauer, Günther

AU - Caha, O.

AU - Schierle, E.

AU - Weschke, E.

AU - Ünal, A. A.

AU - Valencia, S.

AU - Dunst, M.

AU - Braun, J.

AU - Ebert, H.

AU - Minar, J.

AU - Golias, E.

AU - Yashina, Lada V.

AU - Ney, Andreas

AU - Holy, Vaclav

AU - Rader, O.

PY - 2016/2

Y1 - 2016/2

N2 - Magnetic doping is expected to open a band gap at the Dirac point of topological insulators by breaking time-reversal symmetry and to enable novel topological phases. Epitaxial (Bi1−xMnx)2Se3 is a prototypical magnetic topological insulator with a pronounced surface band gap of ~100 meV. We show that this gap is neither due to ferromagnetic order in the bulk or at the surface nor to the local magnetic moment of the Mn, making the system unsuitable for realizing the novel phases. We further show that Mn doping does not affect the inverted bulk band gap and the system remains topologically nontrivial. We suggest that strong resonant scattering processes cause the gap at the Dirac point and support this by the observation of in-gap states using resonant photoemission. Our findings establish a mechanism for gap opening in topological surface states which challenges the currently known conditions for topological protection.

AB - Magnetic doping is expected to open a band gap at the Dirac point of topological insulators by breaking time-reversal symmetry and to enable novel topological phases. Epitaxial (Bi1−xMnx)2Se3 is a prototypical magnetic topological insulator with a pronounced surface band gap of ~100 meV. We show that this gap is neither due to ferromagnetic order in the bulk or at the surface nor to the local magnetic moment of the Mn, making the system unsuitable for realizing the novel phases. We further show that Mn doping does not affect the inverted bulk band gap and the system remains topologically nontrivial. We suggest that strong resonant scattering processes cause the gap at the Dirac point and support this by the observation of in-gap states using resonant photoemission. Our findings establish a mechanism for gap opening in topological surface states which challenges the currently known conditions for topological protection.

UR - http://www.nature.com/ncomms/2016/160219/ncomms10559/full/ncomms10559.html

U2 - 10.1038/ncomms10559

DO - 10.1038/ncomms10559

M3 - Article

SN - 2041-1723

VL - 7

SP - 10559

JO - nature communications

JF - nature communications

M1 - 10559

ER -

Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3

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