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Dynamical Conductivity and Plasmon Excitation in Bi
Author(s) -
Gerlach E.,
Grosse P.,
Rautenberg M.,
Senske W.
Publication year - 1976
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220750218
Subject(s) - plasmon , conductivity , plasma oscillation , bismuth , excitation , coulomb , impurity , electron , kramers–kronig relations , optical conductivity , condensed matter physics , scattering , quasiparticle , ionization , atomic physics , range (aeronautics) , materials science , physics , optics , refractive index , ion , quantum mechanics , superconductivity , metallurgy , composite material
The reflectivity of bismuth crystals is measured in the spectral range 50 to 500 cm −1 . From the measured data the dielectric function is determined by a'Kramers‐Kronig analysis. The dispersion of this function is explained by the dynamical conductivity of a free electron gas. At frequencies above the plasma edge there is a contribution which is due to the excitation of plasmons by the interaction of the free electrons with the Coulomb fields of impurities. This contribution can be expected from model calculations of the dynamical conductivity, considering ionized impurity scattering and screening effects.