EuIn2Sb2: epitaxially stabilized axion insulator candidate with strong spin-orbit coupling
Abstract
Eu triangular lattice layer compounds described by the general formula EuA2X2 have attracted growing attention due to a wide range of layered crystal structures and corresponding magnetic topological phases, arising from the coexistence of large Eu magnetic moments and energetically inverted A and X bands. Among the EuA2X2 family, EuIn2Sb2 has been predicted to host robust axion insulator and higher-order topological insulator states by stronger spin-orbit coupling but has not been experimentally realized, including the structural identification. Here we report the epitaxial stabilization of EuIn2Sb2 by adopting the molecular beam epitaxy technique. Structural characterization reveals that EuIn2Sb2 films are based on a unique In-on-In stacking, forming a new trilayer structure distinct from previously predicted structures in the EuA2X2 family. In addition to the in-plane antiferromagnetic ordering at TN=10.5K, the stronger spin-orbit coupling and enhanced In-In hybridization in EuIn2Sb2 make it an ideal candidate of axion insulator and higher-order topological insulator phases. These results establish EuIn2Sb2 as a new member of the EuA2X2 family and offer an advanced platform for exploring these magnetic topological phases.
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BibTeX
@misc{lee2026euin2sb2,
title = {{EuIn2Sb2: epitaxially stabilized axion insulator candidate with strong spin-orbit coupling}},
author = {Hsiang Lee and Shinichi Nishihaya and Markus Kriener and Ayano Nakamura and Tadashi Yoneda and Yuki Deguchi and Makuro Goto and Masaki Uchida},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.02114},
eprint = {2609.02114},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.02114},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - EuIn2Sb2: epitaxially stabilized axion insulator candidate with strong spin-orbit coupling
AU - Hsiang Lee
AU - Shinichi Nishihaya
AU - Markus Kriener
AU - Ayano Nakamura
AU - Tadashi Yoneda
AU - Yuki Deguchi
AU - Makuro Goto
AU - Masaki Uchida
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.02114
UR - https://arxiv.org/abs/2609.02114
AB - Eu triangular lattice layer compounds described by the general formula EuA2X2 have attracted growing attention due to a wide range of layered crystal structures and corresponding magnetic topological phases, arising from the coexistence of large Eu magnetic moments and energetically inverted A and X bands. Among the EuA2X2 family, EuIn2Sb2 has been predicted to host robust axion insulator and higher-order topological insulator states by stronger spin-orbit coupling but has not been experimentally realized, including the structural identification. Here we report the epitaxial stabilization of EuIn2Sb2 by adopting the molecular beam epitaxy technique. Structural characterization reveals that EuIn2Sb2 films are based on a unique In-on-In stacking, forming a new trilayer structure distinct from previously predicted structures in the EuA2X2 family. In addition to the in-plane antiferromagnetic ordering at TN=10.5K, the stronger spin-orbit coupling and enhanced In-In hybridization in EuIn2Sb2 make it an ideal candidate of axion insulator and higher-order topological insulator phases. These results establish EuIn2Sb2 as a new member of the EuA2X2 family and offer an advanced platform for exploring these magnetic topological phases.
ER -