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

Scientific paper - Letter

• Author: D. Santos-Cottin
• Author: J. Wyzula
• Author: F. Le Mardelé
• Author: I. Crassee
• Author: E. Martino
• Author: J. Novák
• Author: G. Eguchi
• Author: Zoran Rukelj
• Author: M. Novak
• Author: M Orlita
• Author: Ana Akrap
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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... 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. Less

• Keywords (english): Weyl cones; Landau level spectroscopy
• Language: english
• Publication type: Scientific paper - Letter
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review B (condensed matter and materials physics)
• Numbering: vol. 105, no. 8, L081114
• p-ISSN: 2469-9950
• e-ISSN: 2469-9969
• DOI: https://doi.org/10.1103/PhysRevB.105.L081114
• URN:NBN: urn:nbn:hr:217:115574
• Publication: 2022-02
• Document URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.105.L081114
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2022 American Physical Society. Received 20 November 2021; accepted 10 February 2022; published 25 February 2022.
• Created on: 2024-08-21 09:53:44