Observation of termination-dependent topological connectivity in a magnetic Weyl Kagome lattice

Federico Mazzola, Stefan Enzner, Philipp Eck, Chiara Bigi, Matteo Jugovac, Iulia Cojocariu, Vitaliy Feyer, Zhixue Shu, Gian Marco Pierantozzi, Alessandro De Vita, Pietro Carrara, Jun Fujii, Phil D. C. King, Giovanni Vinai, Pasquale Orgiani, Cephise Cacho, Matthew D. Watson, Giorgio Rossi, Ivana Vobornik, Tai KongDomenico Di Sante, Giorgio Sangiovanni, Giancarlo Panaccione

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Abstract

Engineering surfaces and interfaces of materials promises great potential in the field of heterostructures and quantum matter designers, with the opportunity to drive new many-body phases that are absent in the bulk compounds. Here, we focus on the magnetic Weyl kagome system Co3Sn2S2 and show how for the terminations of different samples the Weyl points connect differently, still preserving the bulk-boundary correspondence. Scanning tunneling microscopy has suggested such a scenario indirectly, and here, we probe the Fermiology of Co3Sn2S2 directly, by linking it to its real space surface distribution. By combining micro-ARPES and first-principles calculations, we measure the energy-momentum spectra and the Fermi surfaces of Co3Sn2S2 for different surface terminations and show the existence of topological features depending on the top-layer electronic environment. Our work helps to define a route for controlling bulk-derived topological properties by means of surface electrostatic potentials, offering a methodology for using Weyl kagome metals in responsive magnetic spintronics.
Original languageEnglish
Pages (from-to)8035–8042
JournalNano Letters
Volume23
Issue number17
Early online date28 Aug 2023
DOIs
Publication statusPublished - 13 Sept 2023

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