Abstract
A surface plasma wave (SPW) over bismuth-vacuum interface has a signature of mass anisotropy of free electrons. For SPW propagation along the trigonal axis there is no birefringence. The frequency cutoff of SPW\(\omega _{cutoff} = \omega _p /\sqrt {2(\varepsilon _L + \varepsilon )} \) lies in the far infrared region and can be accessed using free electron laser. The damping rate of waves at low temperatures is low. The surface plasma wave may be excited by an electron beam of current ∼100 mA propagating parallel to the interface in its close proximity.
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Jain, A.P., Parashar, J. Surface plasma waves over bismuth-vacuum interface. Pramana - J Phys 61, 625–631 (2003). https://doi.org/10.1007/BF02705485
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DOI: https://doi.org/10.1007/BF02705485