Surface state evolution induced by magnetic order in axion insulator candidate EuIn2As2

Abstract

Gapping of Dirac surface states through time reversal symmetry breaking may realize the axion insulator state in condensed matter. Despite tremendous efforts, only a few material systems fall in this category of intrinsic magnetic topological insulators (TI). Recent theoretical calculations proposed the antiferromagnetic EuIn${}_2$As${}_2$ to be a topologically non-trivial magnetic insulator with gapped surface states. Here we use scanning tunneling microscopy and spectroscopy (STM/STS) complemented with density-functional theory (DFT) calculations and modelling to probe the surface electronic states in EuIn${}_2$As${}_2$. We find a spin-orbit induced bulk gap of ~120 meV located only a few meV above the Fermi energy, within which topological surface states reside. Temperature dependent measurements provide evidence of the partial gapping (~40 meV) of the surface states at low temperatures below the AFM order, which decreases with increasing temperature but remains finite above $T_N$

arXiv comment8 pages, 8 figures, to be published in Physical Review B

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Cited by in corpus (4)

• Ab-initio overestimation of the topological region in Eu-based compounds
• Intrinsic Magnetic Topological Materials
• Incommensurate broken helix induced by nonstoichiometry in the axion insulator candidate EuIn${}_2$As${}_2$
• Exploring Intrinsic Magnetic Topological Insulators: The Case of EuIn${}_2$As${}_2$