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Radial Spin Texture of the Weyl Fermions in Chiral Tellurium

Gatti, G. and Gosálbez-Martínez, D, and Tsirkin, S. S. and Fanciulli, M. and Puppin, M. and Polishchuk, S. and Moser, S. and Testa, L. and Martino, E. and Roth, S. and Bugnon, Ph. and Moreschini, L. and Bostwick, A. and Jozwiak, C. and Rotenberg, E. and Di Santo, G. and Petaccia, L. and Vobornik, I. and Fujii, J, and Wong, J. and Jariwala, D. and Atwater, H. A. and Rønnow, H. M. and Chergui, M. and Yazyev, O. V. and Grioni, M. and Crepaldi, A. (2020) Radial Spin Texture of the Weyl Fermions in Chiral Tellurium. Physical Review Letters, 125 (21). Art. No. 216402. ISSN 0031-9007. https://resolver.caltech.edu/CaltechAUTHORS:20201123-084319706

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/physrevlett.125.216402DOIArticle
ORCID:
AuthorORCID
Gatti, G.0000-0002-2048-1791
Tsirkin, S. S.0000-0001-5064-0485
Fanciulli, M.0000-0002-7018-0110
Puppin, M.0000-0002-1328-7165
Polishchuk, S.0000-0001-5535-0479
Moser, S.0000-0003-0042-2214
Testa, L.0000-0002-6610-9282
Martino, E.0000-0001-9654-9820
Moreschini, L.0000-0001-8226-084X
Jozwiak, C.0000-0002-0980-3753
Rotenberg, E.0000-0002-3979-8844
Di Santo, G.0000-0001-9394-2563
Petaccia, L.0000-0001-8698-1468
Wong, J.0000-0002-6304-7602
Jariwala, D.0000-0002-3570-8768
Atwater, H. A.0000-0001-9435-0201
Rønnow, H. M.0000-0002-8832-8865
Chergui, M.0000-0002-4856-226X
Yazyev, O. V.0000-0001-7281-3199
Grioni, M.0000-0003-3338-412X
Crepaldi, A.0000-0001-9971-1731
Additional Information:© 2020 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Received 22 July 2020; revised 15 September 2020; accepted 2 October 2020; published 19 November 2020. We acknowledge financial support by the Swiss National Science Foundation (SNSF), in particular L. T. acknowledges support under Grant No. 200020_188648, M. F. under Grant No. P2ELP2_181877, and S. M. under Grant No. P300P2-171221. D. G. M., S. S. T., and O. V. Y. acknowledge the support by the NCCR. S. S. T. acknowledges support from the European Union Horizon 2020 Research and Innovation Program (ERC-StG-Neupert-757867-PARATOP) and Swiss National Science Foundation (Grant No. PP00P2_176877). M. P., S. P., and M. C. acknowledge the support by the ERC Advanced Grant No. 695197 (DYNAMOX)) and the Swiss National Science Foundation NCCR:MUST Grant. We gratefully acknowledge support from the Department of Energy, Office of Science under Grant No. DE-FG02-07ER46405. J. W. acknowledges a National Science Foundation Graduate Research Fellowship under Grant No. 1144469. All first-principles calculations were performed at the Swiss National Supercomputing Centre (CSCS) under Projects No. s832 and No. s1008. We acknowledge Elettra Sincrotrone Trieste for providing access to its synchrotron radiation facilities. This work has been partly performed in the framework of the nanoscience foundry and fine analysis (NFFA-MIUR Italy Progetti Internazionali) facility. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility, under Contract No. DE-AC02-05CH11231.
Funders:
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)200020_188648
Swiss National Science Foundation (SNSF)P2ELP2_181877
Swiss National Science Foundation (SNSF)P300P2-171221
European Research Council (ERC)757867
Swiss National Science Foundation (SNSF)PP00P2_176877
European Research Council (ERC)695197
Swiss National Science Foundation (SNSF)MUST
Department of Energy (DOE)DE-FG02-07ER46405
NSF Graduate Research FellowshipDGE-1144469
Swiss National Supercomputing Centres832
Swiss National Supercomputing Centres1008
Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:21
Record Number:CaltechAUTHORS:20201123-084319706
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201123-084319706
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106777
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Nov 2020 16:54
Last Modified:23 Nov 2020 16:54

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