Native point defects and their implications for the Dirac point gap at MnBi2Te4(0001)

M. Garnica, M. M. Otrokov, P. Casado Aguilar, I. I. Klimovskikh, D. Estyunin, Z. S. Aliev, I. R. Amiraslanov, N. A. Abdullayev, V. N. Zverev, M. B. Babanly, N. T. Mamedov, A. M. Shikin, A. Arnau, A. L. Vazquez de Parga, E. V. Chulkov, R. Miranda

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

2 Цитирования (Scopus)

Аннотация

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.
Язык оригиналаанглийский
Номер статьи7
Число страниц9
Журналnpj Quantum Materials
Том7
Номер выпуска1
DOI
СостояниеОпубликовано - дек 2022

Предметные области Scopus

  • Электроника, оптика и магнитные материалы
  • Физика конденсатов

Fingerprint

Подробные сведения о темах исследования «Native point defects and their implications for the Dirac point gap at MnBi2Te4(0001)». Вместе они формируют уникальный семантический отпечаток (fingerprint).

Цитировать