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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 …
American Chemical Society
Publication date: 
2 Sep 2021

Jun Fujii, Barun Ghosh, Ivana Vobornik, Anan Bari Sarkar, Debashis Mondal, Chia-Nung Kuo, François C Bocquet, Lixue Zhang, Danil W Boukhvalov, Chin Shan Lue, Amit Agarwal, Antonio Politano

Biblio References: 
ACS nano