Far-Infrared Magneto-Plasma Wave Transmission and the Dielectric Constant in Bismuth under High Magnetic Fields

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Far-infrared magneto-plasma wave transmission in Bi was observed in pulsed high magnetic fields up to 40 T using an HCN laser (337 μm wavelength). The Fabry-Pérot interferograms due to the propagation of the Alfvén wave were observed as well as the cyclotron resonance, the combined resonance, and the Shubnikov-de Haas effect. The mass densities were obtained for the magnetic field parallel to the binary axis and electric field parallel to the bisectrix and trigonal axis. The lattice dielectric constant ε_⁄⁄ was obtained as ε_⁄⁄=48. As for ε_⊥, however, an anomalously large increase of ε_⊥ was observed as the magnetic field was increased above 14 T. The large field-dependence of ε_⊥ was explained semi-quantitatively by the interband coupling between the lowest Landau levels of the conduction and valence bands for light electrons.