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On the Theory of Low‐Temperature Exciton Absorption Spectra
Author(s) -
Fedoseev V.,
Hizhnyakov V.
Publication year - 1968
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.19680270232
Subject(s) - exciton , phonon , line (geometry) , spectral line , physics , zero (linguistics) , condensed matter physics , absorption spectroscopy , absorption (acoustics) , atomic physics , quantum mechanics , optics , mathematics , linguistics , philosophy , geometry
Abstract The absorption spectrum of Wannier‐Mott excitons at low temperature is studied in the case of weak exciton–phonon coulping. The one‐phonon approximation is used. Only the interaction of excitons with acoustic phonons is taken into account. It is shown that for low temperatures ( k 0 T ≪ 2 m c 2 ) the exciton spectrum consists of a resonant line with its halfwidth tending to zero if T → 0, and of a phonon wing of finite width with the maximum being shifted from the resonant line. In the case T = 0 the resonant line appears to be a zero‐phonon line and the wing represents the vibrational recurrences of the first.