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Report No.
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Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator MnBi$$_{2}$$Te$$_{4}$$

Shikin, A. M.*; Estyunin, D. A.*; Klimovskikh, I. I.*; Filnov, S. O.*; Kumar, S.*; Schwier, E. F.*; Miyamoto, Koji*; Okuda, Taiichi*; Kimura, Akio*; Kuroda, Kenta*; Yaji, Koichiro*; Shin, S.*; Takeda, Yukiharu; Saito, Yuji; Aliev, Z. S.*; Mamedov, N.*; Amiraslanov, I. R.*; Babanly, M. B.*; Otrokov, M. M.*; Eremeev, S. V.*; Chulkov, E. V.*

Modification of the gap at the Dirac point (DP) in axion antiferromagnetic topological insulator MnBi$$_{2}$$Te$$_{4}$$ and its electronic and spin structure have been studied by angle- and spin-resolved photoemission spectroscopy (ARPES) under laser excitation at various temperatures, light polarizations and photon energies. We have distinguished both large and reduced gaps at the DP in the ARPES dispersions, which remain open above the N$'{e}$el temperature of $$T_textrm{N}$$ = 24.5 K. We propose that the gap above $$T_textrm{N}$$ remains open due to a short-range magnetic field generated by chiral spin fluctuations. Spin-resolved ARPES, XMCD and circular dichroism ARPES measurements show a surface ferromagnetic ordering for the large gap sample and apparently significantly reduced effective magnetic moment for the reduced gap sample.

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