Weyl Fermion magneto-electrodynamics and ultralow field quantum limit in TaAs

Lu, Zhengguang; Hollister, Patrick; Ozerov, Mykhaylo; Moon, Seungbin; Bauer, E. D.; Ronning, F.; Smirnov, Dmitry; Ju, Long; Ramshaw, B. J.

doi:10.1126/sciadv.abj1076

Sci. Adv.

2022

DOI: 10.1126/sciadv.abj1076

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Weyl Fermion magneto-electrodynamics and ultralow field quantum limit in TaAs

Zhengguang Lu¹,

Patrick Hollister²,

Mykhaylo Ozerov³

et al.

Abstract: Infrared spectroscopy in high magnetic fields reveals the lowest quantum limit in a Weyl semimetal.

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Cited by 4 publications

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“…Magneto-optical spectra are exceptionally rich. Far below 1 T, TaAs reaches its quantum regime and the inter-LL transitions become apparent [23]. Figures 2(a)-2(c) show a striking series of inter-LL transitions along the (101) facet.…”

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confidence: 96%

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

et al. 2022

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

et al. 2022

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Unconventional thermoelectric transport in tilted Weyl semimetals

Cortijo

Vozmediano

et al. 2023

Phys. Rev. B

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Anomalous chiral transport with vorticity and torsion: Cancellation of two mixed gravitational anomaly currents in rotating chiral p+ip Weyl condensates

Nissinen

Volovik

2022

Phys. Rev. D

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Weyl Fermion magneto-electrodynamics and ultralow field quantum limit in TaAs

Abstract: Infrared spectroscopy in high magnetic fields reveals the lowest quantum limit in a Weyl semimetal.

Cited by 4 publications

References 38 publications

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

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

Unconventional thermoelectric transport in tilted Weyl semimetals

Anomalous chiral transport with vorticity and torsion: Cancellation of two mixed gravitational anomaly currents in rotating chiral p+ip Weyl condensates

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