Termination-Dependent Surface Fermiology in the Intercalated Altermagnet CoNb4Se8

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2026-10-19 DOI:10.1021/acs.nanolett.6c01819

Pietro Maria Forcella,Alessandro De Vita,Matthew D. Watson,Sammar Tayyab,Chiara Bigi,Iulia Cojocariu,Marcin Szpytma,Matteo Jugovac,Andrea Locatelli,Tevfik Onur Menteş,My Bang Petersen,Paolo Moras,Polina M. Sheverdyaeva,Christopher Candelora,Ilija Zeljkovic,Federico Motti,Jill A. Miwa,Vincent Polewczyk,Matthieu Jamet,Matteo Calandra,Younghun Hwang,Davide Romanin,Federico Mazzola

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Abstract

Altermagnets have recently gained attention for hosting symmetry-enforced spin-split bands despite zero net magnetization. Angle-resolved photoelectron spectroscopy (ARPES) offers direct access to their electronic structure. However, the intrinsic surface sensitivity of this technique complicates the identification of the observed features: Surface states can be misinterpreted as the spin-split counterpart of bulk bands. This issue becomes particularly relevant for layered intercalated systems, where micrometer-sized domains with distinct terminations often coexist on a cleaved surface. We discuss this scenario for CoNb4Se8, one of the first established layered altermagnets. Supported by density functional theory calculations, we employ micro-ARPES to probe individual domains and reveal two contrasting surface terminations. We identify Co- and Se-terminated domains with characteristic surface states arising from bulk-surface connectivity of the material. Our work shows that termination-dependent surface contributions are essential for the reliable spectroscopic identification of altermagnetism and for assessing its presence across the family of layered materials.

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插层交变磁体CoNb4Se8的终端依赖表面费米学

尽管净磁化强度为零，但替代磁体最近因承载对称强迫自旋分裂带而受到关注。角分辨光电子能谱（ARPES）提供了对其电子结构的直接访问。然而，该技术固有的表面灵敏度使观测特征的识别复杂化：表面状态可能被误解为体带的自旋分裂对应。这个问题对于层状插层系统尤为重要，在这种系统中，具有不同末端的微米级结构域通常共存于切割表面上。我们讨论了CoNb4Se8的这种情况，CoNb4Se8是最早建立的层状交替磁体之一。在密度泛函理论计算的支持下，我们使用微arpes探测单个结构域并揭示两种不同的表面末端。我们确定Co和se端域具有由材料的体-表面连通性引起的特征表面状态。我们的工作表明，终端依赖的表面贡献对于可靠的电磁光谱识别和评估其在层状材料家族中的存在是必不可少的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.