Physical Review B, volume 102, issue 8, publication number 085149
Probe-dependent Dirac-point gap in the gadolinium-doped thallium-based topological insulator TlBi0.9Gd0.1Se2
Filnov S. O.
1
,
Klimovskikh I I
1
,
Estyunin D A
1
,
FEDOROV A. V.
2, 3
,
Voroshnin V Yu
1, 3
,
Voroshnin V. Yu.
1, 3
,
Koroleva A V
1
,
Koroleva A. V.
1
,
Rybkin Artem G.
1
,
Rybkin A G
1
,
Shevchenko E V
1
,
Shevchenko E. V.
1
,
Aliev Ziya S.
4, 5
,
Babanly M.
6, 7
,
Babanly M. B.
6, 7
,
Amiraslanov I R
5, 7
,
Amiraslanov I. R.
5, 7
,
Mamedov N. T.
5
,
Mamedov Nazim
5
,
Schwier Eike. F.
8
,
Schwier E. F.
8
,
MIYAMOTO K.
8
,
Miyamoto Koji
8
,
Okuda T.
8
,
Kumar S.
8
,
Kimura A.
9, 10
,
Kimura Akihiko
9, 10
,
Misheneva V. M.
1
,
SHIKIN A. M.
1
,
Chulkov E.V.
1, 11, 12, 13
,
CHULKOV E. V.
1, 11, 12, 13
3
Helmholtz-Zentrum Berlin fr Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
|
8
Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-0046, Japan
|
9
Department of Physical Sciences, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
|
10
Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-hiroshima 739-8526, Japan
|
Publication type: Journal Article
Publication date: 2020-08-26
Journal:
Physical Review B
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 3.7
ISSN: 24699950, 24699969, 10980121, 1550235X
Abstract
A tunable gap in the topological surface state is of great interest for novel spintronic devices and applications in quantum computing. Here, we study the surface electronic structure and magnetic properties of the Gd-doped topological insulator $\mathrm{Tl}{\mathrm{Bi}}_{0.9}{\mathrm{Gd}}_{0.1}{\mathrm{Se}}_{2}$. Utilizing superconducting quantum interference device magnetometry, we show paramagnetic behavior down to 2 K. Combining spin- and angle-resolved photoemission spectroscopy with different polarizations of light, we demonstrate that the topological surface state is characterized by the Dirac cone with a helical spin structure and confirm its localization within the bulk band gap. By using different light sources in photoemission spectroscopy, various Dirac-point gap values were observed: 50 meV for $h\ensuremath{\nu}=18\phantom{\rule{0.28em}{0ex}}\mathrm{eV}$ and 20 meV for $h\ensuremath{\nu}=6.3\phantom{\rule{0.28em}{0ex}}\mathrm{eV}$. Here, we discuss the gap observation by the angle-resolved photoemission spectroscopy method as a consequence of the scattering processes. Simulating the corresponding spectral function, we demonstrate that the asymmetric energy-distribution curve of the surface state leads to an overestimation of the corresponding gap value. We speculate that 20 meV in our case is a trustworthy value and attribute this gap to be originated by scattering both on magnetic and charge impurities provided by Gd atoms and surface defects. Given the complexity and importance of scattering processes in the topological surface state together with our observations of distinctive photoemission asymmetry, we believe our results are important for research of the massive Dirac fermions in novel quantum materials.
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Citations by publishers
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1
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American Physical Society (APS)
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3 publications, 50%
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Springer Nature
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2 publications, 33.33%
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Multidisciplinary Digital Publishing Institute (MDPI)
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Multidisciplinary Digital Publishing Institute (MDPI)
1 publication, 16.67%
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- We do not take into account publications that without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Filnov S. O. et al. Probe-dependent Dirac-point gap in the gadolinium-doped thallium-based topological insulator TlBi0.9Gd0.1Se2 // Physical Review B. 2020. Vol. 102. No. 8. 085149
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Filnov S. O., Klimovskikh I. I., Klimovskikh I. I., Estyunin D. A., Estyunin D. A., FEDOROV A. V., Voroshnin V. Y., Voroshnin V. Yu., Koroleva A. V., Koroleva A. V., Rybkin A. G., Rybkin A. G., Shevchenko E. V., Shevchenko E. V., Aliev Z. S., Babanly M., Babanly M. B., Amiraslanov I. R., Amiraslanov I. R., Mamedov N. T., Mamedov N., Schwier E. F., Schwier E. F., MIYAMOTO K., Miyamoto K., Okuda T., Kumar S., Kimura A., Kimura A., Misheneva V. M., Shikin A. M., SHIKIN A. M., CHULKOV E. V., Chulkov E. Probe-dependent Dirac-point gap in the gadolinium-doped thallium-based topological insulator TlBi0.9Gd0.1Se2 // Physical Review B. 2020. Vol. 102. No. 8. 085149
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TY - JOUR
DO - 10.1103/PhysRevB.102.085149
UR - https://doi.org/10.1103%2FPhysRevB.102.085149
TI - Probe-dependent Dirac-point gap in the gadolinium-doped thallium-based topological insulator TlBi0.9Gd0.1Se2
T2 - Physical Review B
AU - Filnov, S. O.
AU - Klimovskikh, I I
AU - FEDOROV, A. V.
AU - Voroshnin, V Yu
AU - Koroleva, A V
AU - Rybkin, A G
AU - Shevchenko, E V
AU - Aliev, Ziya S.
AU - Amiraslanov, I R
AU - Mamedov, N. T.
AU - MIYAMOTO, K.
AU - Okuda, T.
AU - Kumar, S.
AU - Kimura, A.
AU - Misheneva, V. M.
AU - Estyunin, D A
AU - Schwier, E. F.
AU - SHIKIN, A. M.
AU - Babanly, M. B.
AU - CHULKOV, E. V.
AU - Klimovskikh, Ilya I.
AU - Estyunin, Dmitry A.
AU - Voroshnin, V. Yu.
AU - Koroleva, A. V.
AU - Rybkin, Artem G.
AU - Shevchenko, E. V.
AU - Babanly, M.
AU - Amiraslanov, I. R.
AU - Mamedov, Nazim
AU - Schwier, Eike. F.
AU - Miyamoto, Koji
AU - Kimura, Akihiko
AU - Shikin, Alexander M.
AU - Chulkov, E.V.
PY - 2020
DA - 2020/08/26 00:00:00
PB - American Physical Society (APS)
IS - 8
VL - 102
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
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@article{2020_Filnov,
author = {S. O. Filnov and I I Klimovskikh and A. V. FEDOROV and V Yu Voroshnin and A V Koroleva and A G Rybkin and E V Shevchenko and Ziya S. Aliev and I R Amiraslanov and N. T. Mamedov and K. MIYAMOTO and T. Okuda and S. Kumar and A. Kimura and V. M. Misheneva and D A Estyunin and E. F. Schwier and A. M. SHIKIN and M. B. Babanly and E. V. CHULKOV and Ilya I. Klimovskikh and Dmitry A. Estyunin and V. Yu. Voroshnin and A. V. Koroleva and Artem G. Rybkin and E. V. Shevchenko and M. Babanly and I. R. Amiraslanov and Nazim Mamedov and Eike. F. Schwier and Koji Miyamoto and Akihiko Kimura and Alexander M. Shikin and E.V. Chulkov},
title = {Probe-dependent Dirac-point gap in the gadolinium-doped thallium-based topological insulator TlBi0.9Gd0.1Se2},
journal = {Physical Review B},
year = {2020},
volume = {102},
publisher = {American Physical Society (APS)},
month = {aug},
url = {https://doi.org/10.1103%2FPhysRevB.102.085149},
number = {8},
doi = {10.1103/PhysRevB.102.085149}
}