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arXiv · 2609.39161

Spectroscopic Evidence for Nontrivial Band Topology in Superconducting FeTe/MnTe Heterostructure

Shiwu Su·Yu Liang·Tongrui Li·Zhen Wang·Yuzhe Wang·Xianglin Li·Sen Liao·Pengxu Ran·Jiexiong Sun·Shengtao Cui·Zhe Sun·Zhengtai Liu·Jishan Liu·Mao Ye·Jing Tao·Donglai Feng·Juan Jiang
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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 $Z_2$ 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.

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Shiwu Su, Yu Liang, Tongrui Li, Zhen Wang, Yuzhe Wang, Xianglin Li, Sen Liao, Pengxu Ran, Jiexiong Sun, Shengtao Cui, Zhe Sun, Zhengtai Liu, Jishan Liu, Mao Ye, Jing Tao, Donglai Feng, Juan Jiang. 2026-09-30. Spectroscopic Evidence for Nontrivial Band Topology in Superconducting FeTe/MnTe Heterostructure. https://arxiv.org/abs/2609.39161

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