Due to their peculiar quasiparticle excitations, topological metals have high potential for applications in the fields of spintronics, catalysis, and superconductivity. Here, by combining spin- and angle-resolved photoemission spectroscopy, scanning tunneling microscopy/spectroscopy, and density functional theory, we discover surface-termination-dependent topological electronic states in the recently discovered mitrofanovite Pt₃Te₄. Mitrofanovite crystal is formed by alternating, van der Waals bound layers of Pt₂Te₂ and PtTe₂. Our results demonstrate that mitrofanovite is a topological metal with termination-dependent (i) electronic band structure and (ii) spin texture. Despite their distinct electronic character, both surface terminations are characterized by electronic states exhibiting strong spin polarization with a node at the Γ point and sign reversal across the Γ point, indicating their topological nature and the possibility of realizing two distinct electronic configurations (both of them with topological features) on the surface of the same material.

中文翻译：

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Mitrofanovite Pt3Te4：一种具有终止依赖表面带结构和强自旋极化的拓扑金属

由于其特殊的准粒子激发，拓扑金属在自旋电子学、催化和超导领域具有很高的应用潜力。在这里，通过结合自旋和角分辨光电子能谱、扫描隧道显微镜/光谱和密度泛函理论，我们在最近发现的 mitrofanovite Pt ₃ Te _{4 中}发现了依赖于表面终止的拓扑电子态。Mitrofanovite 晶体由 Pt ₂ Te ₂和 PtTe _{2 的}交替范德华束缚层形成. 我们的结果表明 mitrofanovite 是一种拓扑金属，具有终止依赖 (i) 电子能带结构和 (ii) 自旋纹理。尽管它们具有独特的电子特性，但两个表面终端的特点是电子状态表现出强烈的自旋极化，在 Γ 点有一个节点，并且在 Γ 点上符号反转，表明它们的拓扑性质和实现两种不同电子配置的可能性（它们都是具有拓扑特征）在相同材料的表面上。