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Radial spin texture of the Weyl fermions in chiral tellurium

Gianmarco Gatti1*, Daniel Gosálbez-Martínez1,2, Stepan S. Tsirkin3, Mauro Fanciulli4, Michele Puppin5, Serhii Polishchuk5, Simon Moser6, Luc Testa1, Edoardo Martino1, Silvan Roth1, Philippe Bugnon1, Luca Moreschini6, Aaron Bostwick6, Chris Jozwiak6, Eli Rotenberg6, Giovanni Di Santo7, Luca Petaccia7, Ivana Vobornik8, Jun Fujii8, Joeson Wong9, Deep Jariwala10, Harry Atwater9, Heinrik Rønnow1, Majed Chergui5, Oleg Yazyev1, Marco Grioni1, Alberto Crepaldi1

1 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

2 National Centre for Computational Design and Discovery of Novel Materials MARVEL, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

3 Department of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland

4 Laboratoire de Physique des Matériaux et Surfaces, CY Cergy Paris Université, 95031 Cergy-Pontoise, France

5 Laboratory of Ultrafast Spectroscopy, ISIC, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

6 Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

7 Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, 34149 Trieste, Italy

8 CNR-IOM, TASC Laboratory, Area Science Park-Basovizza, 34139 Trieste, Italy

9 Department of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA

10 Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA

* Corresponding authors emails: gianmarco.gatti@unige.ch
DOI10.24435/materialscloud:qp-hy [version v1]

Publication date: Jul 28, 2021

How to cite this record

Gianmarco Gatti, Daniel Gosálbez-Martínez, Stepan S. Tsirkin, Mauro Fanciulli, Michele Puppin, Serhii Polishchuk, Simon Moser, Luc Testa, Edoardo Martino, Silvan Roth, Philippe Bugnon, Luca Moreschini, Aaron Bostwick, Chris Jozwiak, Eli Rotenberg, Giovanni Di Santo, Luca Petaccia, Ivana Vobornik, Jun Fujii, Joeson Wong, Deep Jariwala, Harry Atwater, Heinrik Rønnow, Majed Chergui, Oleg Yazyev, Marco Grioni, Alberto Crepaldi, Radial spin texture of the Weyl fermions in chiral tellurium, Materials Cloud Archive 2021.123 (2021), doi: 10.24435/materialscloud:qp-hy.

Description

Trigonal tellurium, a small-gap semiconductor with pronounced magneto-electric and magneto-optical responses, is among the simplest realizations of a chiral crystal. We have studied by spin- and angle-resolved photoelectron spectroscopy its unconventional electronic structure and unique spin texture. We identify Kramers–Weyl, composite, and accordionlike Weyl fermions, so far only predicted by theory, and show that the spin polarization is parallel to the wave vector along the lines in k space connecting high-symmetry points. Our results clarify the symmetries that enforce such spin texture in a chiral crystal, thus bringing new insight in the formation of a spin vectorial field more complex than the previously proposed hedgehog configuration. Our findings thus pave the way to a classification scheme for these exotic spin textures and their search in chiral crystals. This records refers to the experimental data shown in the referenced article, saved as txt files along with a metadata descriptor file.

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Keywords

topological materials spinARPES Chirality Experimental ERC H2020 SNSF

Version history:

2021.123 (version v1) [This version] Jul 28, 2021 DOI10.24435/materialscloud:qp-hy