Evidence for Weyl fermions in a canonical heavy-fermion semimetal YbPtBi

Guo, C. Y.; Wu, F.; Wu, Z. Z.; Smidman, M.; Cao, C.; Bostwick, A.; Jozwiak, C.; Rotenberg, E.; Liu, Y.; Steglich, F.; Yuan, H. Q.

doi:10.1038/s41467-018-06782-1

Title: Evidence for Weyl fermions in a canonical heavy-fermion semimetal YbPtBi

Journal Article · 04 November 2018 · Nature Communications

DOI: https://doi.org/10.1038/s41467-018-06782-1 · OSTI ID:1493276

Guo, C. Y. ^[1]; Wu, F. ^[1]; Wu, Z. Z. ^[1]; Smidman, M. ^[1]; Cao, C. ^[2]; Bostwick, A. ^[3];

^[3];

^[3]; Liu, Y. ^[1]; Steglich, F. ^[4]; Yuan, H. Q. ^[5]

Zhejiang Univ., Hangzhou (China)
Hangzhou Normal Univ., Hangzhou (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Zhejiang Univ., Hangzhou (China); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Zhejiang Univ., Hangzhou (China); Nanjing Univ., Nanjing (China)

The manifestation of Weyl fermions in strongly correlated electron systems is of particular interest. We report evidence for Weyl fermions in the heavy fermion semimetal YbPtBi from electronic structure calculations, angle-resolved photoemission spectroscopy, magnetotransport and calorimetric measurements. At elevated temperatures where 4f-electrons are localized, there are triply degenerate points, yielding Weyl nodes in applied magnetic fields. These are revealed by a contribution from the chiral anomaly in the magnetotransport, which at low temperatures becomes negligible due to the influence of electronic correlations. Instead, Weyl fermions are inferred from the topological Hall effect, which provides evidence for a Berry curvature, and a cubic temperature dependence of the specific heat, as expected from the linear dispersion near the Weyl nodes. The results suggest that YbPtBi is a Weyl heavy fermion semimetal, where the Kondo interaction renormalizes the bands hosting Weyl points. Furthermore, these findings open up an opportunity to explore the interplay between topology and strong electronic correlations.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1493276

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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The chiral anomaly and thermopower of Weyl fermions in the half-Heusler GdPtBi Hirschberger, Max; Kushwaha, Satya; Wang, Zhijun Nature Materials, Vol. 15, Issue 11 https://doi.org/10.1038/nmat4684	journal	June 2016
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Two-channel conduction in YbPtBi Schilling, M. B.; Löhle, A.; Neubauer, D. arXiv https://doi.org/10.48550/arxiv.1703.05202	text	January 2017
Parity-violating hybridization in heavy Weyl semimetals Chang, Po-Yao; Coleman, Piers arXiv https://doi.org/10.48550/arxiv.1710.09928	text	January 2017

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