Research output: Contribution to journal › Article › peer-review
Native point defects and their implications for the Dirac point gap at MnBi2Te4(0001). / Garnica, M. ; Otrokov, M. M. ; Casado Aguilar, P. ; Klimovskikh, I. I. ; Estyunin, D. ; Aliev, Z. S.; Amiraslanov, I. R.; Abdullayev, N. A.; Zverev, V. N.; Babanly, M. B.; Mamedov, N. T.; Shikin, A. M. ; Arnau, A.; Vazquez de Parga, A. L.; Chulkov, E. V. ; Miranda, R.
In: npj Quantum Materials, Vol. 7, No. 1, 7, 14.01.2022.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Native point defects and their implications for the Dirac point gap at MnBi2Te4(0001)
AU - Garnica, M.
AU - Otrokov, M. M.
AU - Casado Aguilar, P.
AU - Klimovskikh, I. I.
AU - Estyunin, D.
AU - Aliev, Z. S.
AU - Amiraslanov, I. R.
AU - Abdullayev, N. A.
AU - Zverev, V. N.
AU - Babanly, M. B.
AU - Mamedov, N. T.
AU - Shikin, A. M.
AU - Arnau, A.
AU - Vazquez de Parga, A. L.
AU - Chulkov, E. V.
AU - Miranda, R.
N1 - Publisher Copyright: © 2022, The Author(s).
PY - 2022/1/14
Y1 - 2022/1/14
N2 - We study the surface crystalline and electronic structures of the antiferromagnetic topological insulator MnBi2Te4 using scanning tunneling microscopy/spectroscopy (STM/S), micro(μ)-laser angle-resolved photoemission spectroscopy (ARPES), and density functional theory calculations. Our STM images reveal native point defects at the surface that we identify as BiTe antisites and MnBi substitutions. Bulk X-ray diffraction further evidences the presence of the Mn-Bi intermixing. Overall, our characterizations suggest that the defects concentration is nonuniform within crystals and differs from sample to sample. Consistently, the ARPES and STS experiments reveal that the Dirac point gap of the topological surface state is different for different samples and sample cleavages, respectively. Our calculations show that the antiparallel alignment of the MnBi moments with respect to those of the Mn layer can indeed cause a strong reduction of the Dirac point gap size. The present study provides important insights into a highly debated issue of the MnBi2Te4 Dirac point gap.
AB - We study the surface crystalline and electronic structures of the antiferromagnetic topological insulator MnBi2Te4 using scanning tunneling microscopy/spectroscopy (STM/S), micro(μ)-laser angle-resolved photoemission spectroscopy (ARPES), and density functional theory calculations. Our STM images reveal native point defects at the surface that we identify as BiTe antisites and MnBi substitutions. Bulk X-ray diffraction further evidences the presence of the Mn-Bi intermixing. Overall, our characterizations suggest that the defects concentration is nonuniform within crystals and differs from sample to sample. Consistently, the ARPES and STS experiments reveal that the Dirac point gap of the topological surface state is different for different samples and sample cleavages, respectively. Our calculations show that the antiparallel alignment of the MnBi moments with respect to those of the Mn layer can indeed cause a strong reduction of the Dirac point gap size. The present study provides important insights into a highly debated issue of the MnBi2Te4 Dirac point gap.
KW - Electronic properties and materials
KW - Magnetic properties and materials
KW - Topological matter
UR - http://www.scopus.com/inward/record.url?scp=85123177949&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/ad888f18-0a1c-34d6-9605-64a5789a0913/
U2 - https://doi.org/10.1038/s41535-021-00414-6
DO - https://doi.org/10.1038/s41535-021-00414-6
M3 - Article
VL - 7
JO - npj Quantum Materials
JF - npj Quantum Materials
SN - 2397-4648
IS - 1
M1 - 7
ER -
ID: 88469161