Research output: Contribution to journal › Article › peer-review
Signatures of temperature driven antiferromagnetic transition in the electronic structure of topological insulator MnBi2Te4. / Estyunin, D. A. ; Klimovskikh, I. I. ; Shikin, A. M. ; Schwier, E.F.; Otrokov, M. M. ; Kimura, A.; Kumar, S.; Filnov, S. O. ; Aliev, Z.S.; Babanly, M.B.; Chulkov, E. V. .
In: APL Materials, Vol. 8, No. 2, 021105, 2020.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Signatures of temperature driven antiferromagnetic transition in the electronic structure of topological insulator MnBi2Te4
AU - Estyunin, D. A.
AU - Klimovskikh, I. I.
AU - Shikin, A. M.
AU - Schwier, E.F.
AU - Otrokov, M. M.
AU - Kimura, A.
AU - Kumar, S.
AU - Filnov, S. O.
AU - Aliev, Z.S.
AU - Babanly, M.B.
AU - Chulkov, E. V.
N1 - Publisher Copyright: © 2020 Author(s).
PY - 2020
Y1 - 2020
N2 - In this work, we employed angle resolved photoemission spectroscopy (ARPES) to analyze the temperature dependent changes in the electronic structure of the first antiferromagnetic topological insulator MnBi 2Te 4 upon crossing the Néel temperature T N ≈ 25 K. We observed an exchange splitting of the bulk conduction band, which has a power law dependence on temperature (1-T/T0)2β with an onset temperature T 0 well matching the measured bulk T N. We found a matching temperature evolution of the topological surface states integrated spectral weight in the vicinity of the Dirac point. Furthermore, we observed an additional quasi-2D state with Rashba-type splitting, which is also affected by the emerged magnetism and exhibits an opening of a gap, reminiscent of the effect of an out-of-plane magnetic field, below T N. All these findings point toward strong evidence of the interplay between emerged magnetism with bulk and topological surface states. The observed temperature-dependent effects in MnBi 2Te 4 may be used as an experimental fingerprint for the presence of magnetism and may guide the future analysis of ARPES spectra in magnetic topological insulators.
AB - In this work, we employed angle resolved photoemission spectroscopy (ARPES) to analyze the temperature dependent changes in the electronic structure of the first antiferromagnetic topological insulator MnBi 2Te 4 upon crossing the Néel temperature T N ≈ 25 K. We observed an exchange splitting of the bulk conduction band, which has a power law dependence on temperature (1-T/T0)2β with an onset temperature T 0 well matching the measured bulk T N. We found a matching temperature evolution of the topological surface states integrated spectral weight in the vicinity of the Dirac point. Furthermore, we observed an additional quasi-2D state with Rashba-type splitting, which is also affected by the emerged magnetism and exhibits an opening of a gap, reminiscent of the effect of an out-of-plane magnetic field, below T N. All these findings point toward strong evidence of the interplay between emerged magnetism with bulk and topological surface states. The observed temperature-dependent effects in MnBi 2Te 4 may be used as an experimental fingerprint for the presence of magnetism and may guide the future analysis of ARPES spectra in magnetic topological insulators.
KW - ANOMALOUS HALL STATE
KW - DIRAC-FERMION
KW - SYSTEM
UR - http://www.scopus.com/inward/record.url?scp=85079353247&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/a89d0069-8d2e-3e59-a1f4-c6379b51af70/
U2 - https://doi.org/10.1063/1.5142846
DO - https://doi.org/10.1063/1.5142846
M3 - Article
VL - 8
JO - APL Materials
JF - APL Materials
SN - 2166-532X
IS - 2
M1 - 021105
ER -
ID: 52357780