Magneto-optics of a Weyl semimetal beyond the conical band approximation: the case study of TaP

Abstract

Landau-level spectroscopy, the optical analysis of electrons in materials subject to a strong magnetic field, is a versatile probe of the electronic band structure and has been successfully used in the identification of novel states of matter such as Dirac electrons, topological materials or Weyl semimetals. The latter arise from a complex interplay between crystal symmetry, spin-orbit interaction and inverse ordering of electronic bands. Here, we report on unusual Landau-level transitions in the monopnictide TaP that decrease in energy with increasing magnetic field. We show that these transitions arise naturally at intermediate energies in time-reversal-invariant Weyl semimetals where the Weyl nodes are formed by a partially gapped nodal-loop in the band structure. We propose a simple theoretical model for electronic bands in these Weyl materials that captures the collected magneto-optical data to great extent.

arXiv comment6 pages, 3 figures + supplementary materials, accepted in Phys. Rev. Lett

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• Disorder-induced phase transitions in double Weyl semimetals
• Finite-size topological phases from semimetals
• Landau quantization in tilted Weyl semimetals with broken symmetry
• Magneto-optical evidence of tilting effect in coupled Weyl bands
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• Electric and chiral response to a pseudoelectric field in Weyl materials
• Model for charge carrier spectra in topological semimetals of the TaAs family