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Optically Active Lattice Vibrations in Bi 2 Se 3
Author(s) -
Köhler H.,
Becker C. R.
Publication year - 1974
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.2220610218
Subject(s) - lattice vibration , dielectric , vibration , lattice (music) , lattice constant , materials science , radiation , cleavage (geology) , condensed matter physics , reflectivity , optics , molecular physics , atomic physics , physics , phonon , diffraction , optoelectronics , quantum mechanics , composite material , fracture (geology) , acoustics
Abstract The preparation of Bi 2 Se 3 single crystals with low free carrier densities allowed an investigation of the lattice vibrations to be carried out from the reflectivity of cleavage planes at nearly normal incidence of the radiation ( E ⟂ c ). The experimental results can be explained with two classical oscillators, whose eigenfrequencies occur at 92 and 69.5 cm −1 . The static dielectric constant was determined to be 100 ± 10 for E ⟂ c .