Publication details

Addressing shape and extent of Weyl cones in TaAs by Landau level spectroscopy

Authors

SANTOS-COTTIN D. WYZULA J. LE MARDELÉ F. CRASSEE I. MARTINO E. NOVÁK Jiří EGUCHI G. RUKELJ Z. NOVAK M. ORLITA M. AKRAP Ana

Year of publication 2022
Type Article in Periodical
Magazine / Source Physical Review B
MU Faculty or unit

Faculty of Science

Citation
Web https://journals.aps.org/prb/abstract/10.1103/PhysRevB.105.L081114
Doi http://dx.doi.org/10.1103/PhysRevB.105.L081114
Keywords Weyl semimetal; Landau level spectroscopy; magneto-optics; TaAs
Description TaAs is a prime example of a topological semimetal with two types of Weyl nodes, W-1 and W-2, whose bulk signatures have proven elusive. We apply Landau level spectroscopy to crystals with multiple facets and identify-among other low-energy excitations between parabolic bands-the response of a cone extending over a wide energy range. Comparison with density functional theory studies allows us to associate this conical band with nearly isotropic W-2 nodes. In contrast, W-1 cones, which are more anisotropic and less extended in energy, appear to be buried too deep beneath the Fermi level. They cannot be accessed directly. Instead, the excitations in their vicinity give rise to an optical response typical of a narrow-gap semiconductor rather than a Weyl semimetal.

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