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Polarization‐ and Temperature‐Dependent Two‐Phonon Absorption Spectra in InSe
Author(s) -
Riede V.,
Neumann H.,
Lévy F.,
Sobotta H.
Publication year - 1982
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.2221090130
Subject(s) - phonon , polarization (electrochemistry) , spectral line , transmittance , materials science , wavenumber , reflectivity , condensed matter physics , atmospheric temperature range , optics , absorption (acoustics) , molecular physics , chemistry , physics , optoelectronics , thermodynamics , quantum mechanics
Polarization‐ and temperature‐dependent transmittance and reflectance spectra of InSe are measured in the wavenumber range from 200 to 500 cm −1 . The absorption peaks observed are interpreted in terms of two‐phonon combination modes due to Γ point phonons considering the β‐, ϵ‐ and γ‐polytypes. It is concluded that the InSe crystals are of the γ‐polytype. Mode Grüneisen parameters are estimated for the intralayer modes.