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Free keywords:
Arsenic compounds, Hamiltonians, Niobium compounds, Optical properties, Single crystals, Sulfur compounds, Landau levels, Level transition, Magnetic-field, Magneto-optical, Magneto-optical spectra, Magnetooptical properties, Optical response, Spectra's, Spectral range, Square-root, Magnetic fields
Abstract:
The magneto-optical properties of (001)-oriented NbAs single crystals have been studied in the spectral range from 5 to 150 meV and in magnetic fields of up to 13 T. A rich spectrum of inter-Landau-level transitions is revealed by these measurements. The transitions follow a square-root-like dependence with magnetic field, but the simple linear-band approximation is unable to accurately reproduce the observed behavior of the transitions in applied fields. We argue that the detected magneto-optical spectra should be related to crossing hyperbolic bands, which form the W1 cones. We propose a model Hamiltonian, which describes coupled hyperbolic bands and reproduces the shape of the relevant bands in NbAs. The magneto-optical spectra computed from this Hamiltonian nicely reproduce our observations. We conclude that the hyperbolic-band approach is a minimal model to adequately describe the magneto-optical response of NbAs and that the chiral (conical) bands do not explicitly manifest themselves in the spectra. © 2023 American Physical Society.
