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O: Fachverband Oberflächenphysik
O 103: Topology and Symmetry Protected Materials I
O 103.11: Vortrag
Donnerstag, 19. März 2020, 13:00–13:15, WIL A317
Fully radial spin texture in the chiral crystal of Te — Gianmarco Gatti1, Daniel Gosálbez-Martinez1, Michele Puppin1, Serhii Polishchuk1, Philippe Bugnon1, Ivana Vobornik2, Oleg Yazyev1, Marco Grioni1, and •Alberto Crepaldi1 — 1École polytechnique fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland — 2C.N.R. - I.O.M., Strada Statale 14, km 163.5, Trieste 34149, Italy
Chiral crystals are the new frontier in the field of topological materials. The absence of mirror-symmetry protects special fermions that have no counterparts in high-energy Physics [1], such as the Kramers-Weyl fermions [2]. These special nodes manifest unique magneto-electrical and optical properties, as consequence of their unique fully radial spin texture.
Trigonal tellurium (Te) is among the simplest realization of a gyrotropic chiral crystal, and our high-resolution ARPES data, supported by ab initio calculations, reveal the existence of multiple Kramers-Weyl points [3]. By using spin-resolved ARPES, we have resolved the monopole-like spin texture of the Fermi surface, whose experimental determination represent a fundamental piece to clarify the complex puzzle of the magneto-transport properties of Te [4]. Our results indicate that this material might constitute a major breakthrough in the field of topological materials.
References: [1] B. Bradlyn et al., Science 353, aaf5037 (2016). [2] G. Chang et al., Nat. Materials 17, 978 (2018). [3] G. Gatti in preparation. [4] S. S. Tsirkin et al., Phys. Rev. B 97, 035158 (2018).