Spectroscopic Evidence for Nontrivial Band Topology in Superconducting FeTe/MnTe Heterostructure
Abstract
FeTe has long been regarded as a nonsuperconducting antiferromagnetic metal with trivial band topology, but recent advances in stoichiometry control have begun to challenge this picture. Here we use higher-order epitaxy on zinc-blende MnTe to stabilize near-stoichiometric FeTe with strongly suppressed interstitial Fe and a superconducting transition onset near 13 K. Angle-resolved photoemission spectroscopy reveals markedly enhanced quasiparticle coherence, well-defined Fe-derived hole bands, and a nearly two-dimensional Dirac-cone-like state near the Fermi level. First-principles calculations identify an inversion between odd- and even-parity bands, yielding nontrivial Z2 topology and a Dirac surface state consistent with experiment. These results elucidate the intrinsic electronic structure of stoichiometric superconducting FeTe and provide evidence for nontrivial band topology, positioning FeTe/MnTe as a promising platform for exploring topological superconductivity.
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BibTeX
@misc{su2026spectroscopic,
title = {{Spectroscopic Evidence for Nontrivial Band Topology in Superconducting FeTe/MnTe Heterostructure}},
author = {Shiwu Su and Yu Liang and Tongrui Li and Zhen Wang and Yuzhe Wang and Xianglin Li and Sen Liao and Pengxu Ran and Jiexiong Sun and Shengtao Cui and Zhe Sun and Zhengtai Liu and Jishan Liu and Mao Ye and Jing Tao and Donglai Feng and Juan Jiang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.39161},
eprint = {2609.39161},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.39161},
}
RIS
TY - UNPB
TI - Spectroscopic Evidence for Nontrivial Band Topology in Superconducting FeTe/MnTe Heterostructure
AU - Shiwu Su
AU - Yu Liang
AU - Tongrui Li
AU - Zhen Wang
AU - Yuzhe Wang
AU - Xianglin Li
AU - Sen Liao
AU - Pengxu Ran
AU - Jiexiong Sun
AU - Shengtao Cui
AU - Zhe Sun
AU - Zhengtai Liu
AU - Jishan Liu
AU - Mao Ye
AU - Jing Tao
AU - Donglai Feng
AU - Juan Jiang
PY - 2026
DA - 2026/09/30
PB - arXiv
DO - 10.48550/arxiv.2609.39161
UR - https://arxiv.org/abs/2609.39161
AB - FeTe has long been regarded as a nonsuperconducting antiferromagnetic metal with trivial band topology, but recent advances in stoichiometry control have begun to challenge this picture. Here we use higher-order epitaxy on zinc-blende MnTe to stabilize near-stoichiometric FeTe with strongly suppressed interstitial Fe and a superconducting transition onset near 13 K. Angle-resolved photoemission spectroscopy reveals markedly enhanced quasiparticle coherence, well-defined Fe-derived hole bands, and a nearly two-dimensional Dirac-cone-like state near the Fermi level. First-principles calculations identify an inversion between odd- and even-parity bands, yielding nontrivial Z_2 topology and a Dirac surface state consistent with experiment. These results elucidate the intrinsic electronic structure of stoichiometric superconducting FeTe and provide evidence for nontrivial band topology, positioning FeTe/MnTe as a promising platform for exploring topological superconductivity.
ER -