Magnetism breaks the time-reversal symmetry expected to open a Dirac gap in 3D topological insulators that consequently leads to the quantum anomalous Hall effect. The most common approach of inducing a ferromagnetic state is by doping magnetic 3 elements into the bulk of 3D topological insulators. In , the material where the quantum anomalous Hall effect was initially discovered at temperatures much lower than the ferromagnetic transition, , the scanning tunneling microscopy studies have reported a large Dirac gap of meV. The discrepancy between the low temperature of quantum anomalous Hall effect () and large spectroscopic Dirac gaps () found in magnetic topological insulators remains puzzling. Here, we used angle-resolved photoemission spectroscopy to study the surface electronic structure of the pristine and potassium doped surface of . Upon potassium deposition, the -type surface state of the pristine sample was turned into an -type, allowing the spectroscopic observation of Dirac point. We find a gapless surface state, with no evidence of a large Dirac gap reported in tunneling studies.
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Absence of a Dirac gap in ferromagnetic Crx(Bi0.1Sb0.9)2−xTe3
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28 February 2021
Research Article|
February 24 2021
Absence of a Dirac gap in ferromagnetic Crx(Bi0.1Sb0.9)2−xTe3
Special Collection:
Topological Materials and Devices
Chung Koo Kim;
Chung Koo Kim
1
Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
, Upton, New York 11973, USA
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Jonathan D. Denlinger;
Jonathan D. Denlinger
2
Advanced Light Source, Lawrence Berkeley National Laboratory
, Berkeley, California 94305, USA
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Asish K. Kundu
;
Asish K. Kundu
1
Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
, Upton, New York 11973, USA
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Genda Gu;
Genda Gu
1
Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
, Upton, New York 11973, USA
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Tonica Valla
Tonica Valla
a)
1
Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
, Upton, New York 11973, USA
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the Special Topic on Topological Materials and Devices.
J. Appl. Phys. 129, 083902 (2021)
Article history
Received:
November 30 2020
Accepted:
January 23 2021
Citation
Chung Koo Kim, Jonathan D. Denlinger, Asish K. Kundu, Genda Gu, Tonica Valla; Absence of a Dirac gap in ferromagnetic Crx(Bi0.1Sb0.9)2−xTe3. J. Appl. Phys. 28 February 2021; 129 (8): 083902. https://doi.org/10.1063/5.0039059
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