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    Spin-polarized Dirac points and near-flat bands in FePd2Te2 with a one-dimensional ferromagnetic zigzag chain

    Pengfei Ding*, Huihui He*, Bingxian Shi*, Zhixiao He, Xiaoxu Gao, Peng Cheng†, Kai Liu‡, and Shancai Wang§

    • School of Physics, Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China

    • *These authors contributed equally to this work.
    • †Contact author: pcheng@ruc.edu.cn
    • ‡Contact author: kliu@ruc.edu.cn
    • §Contact author: scw@ruc.edu.cn

    Phys. Rev. B 113, 075151 – Published 24 February, 2026

    DOI: https://doi.org/10.1103/cbyr-vwlw

    Abstract

    One-dimensional zigzag chains offer a striking platform for hosting Dirac fermions protected by glide reflection symmetry, along with nearly flat electronic bands. Though rich in theoretical promise, these lattices are mostly found as structural fragments rather than in fully formed bulk crystals. In this study, we investigate the electronic structure of ferromagnetic FePd2Te2, with angle-resolved photoemission spectroscopy and density functional theory. We find out that the Fe zigzag chains contribute to Dirac-like dispersions and flat orbitals near EF. With the presence of strong uniaxial ferromagnetism, both the Dirac fermions and the near-flat band are intrinsically spin polarized. Additionally, the presence of Weyl points near EF is predicted. FePd2Te2 could be the first quasi-1D system for investigating the Dirac point and flat bands, as well as emergent topological phenomena.

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