Abstract
The electrostatic theory of surface magnetoplasmons on a semi-infinite magnetized electron gas is generalized to mixed Faraday–Voigt configurations. We analyze a mixed Faraday–Voigt type of electrostatic surface waves that is strongly direction-dependent, and may be realized on narrow-gap semiconductors in the THz regime. A general expression for the dispersion relation is presented, with its dependence on the magnitude and orientation of the applied magnetic field. Remarkably, the group velocity is always perpendicular to the phase velocity. Both velocity and energy relations of the found magnetoplasmons are discussed in detail. In the appropriate limits the known surface magnetoplasmons in the higher-symmetry Faraday and Voigt configurations are recovered.
Highlights
It is well-known that a static magnetic field causes various important changes in the electromagnetic behavior of different m edia[1,2,3]
The ± solutions correspond to the Cartesian coordinate system shown in Fig. 1: for a static magnetic field B0 fixed along the −ex, we have the + solution and the surface magnetoplasmon (SMP) frequency is blueshifted, while for a static magnetic field B0 fixed along the +ex the freq√uency of SMP is redshifted
We have studied the propagation of SMPs on a semi-infinite magnetized electron gas in the electrostatic approximation by consideration of a mixed Faraday–Voigt configuration
Summary
It is well-known that a static magnetic field causes various important changes in the electromagnetic behavior of different m edia[1,2,3].
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