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Differential Transmission Spectroscopy (DTS) in Cu 2 O in the Presence of Cold Excitons
Author(s) -
Jolk A.,
Jörger M.,
Klingshirn C.F.,
Franco M.,
Prade B.,
Mysyrowicz A.
Publication year - 2000
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 - 10.1002/1521-3951(200009)221:1<295::aid-pssb295>3.0.co;2-a
Subject(s) - exciton , femtosecond , dissociation (chemistry) , absorption spectroscopy , spectroscopy , atomic physics , biexciton , absorption (acoustics) , materials science , phonon , laser , molecular physics , chemistry , physics , optics , condensed matter physics , quantum mechanics , composite material
A high density of cold 1s orthoexcitons was created in Cu 2 O using two counterpropagating high‐power femtosecond infrared (IR) laser beams tuned to half the 1s exciton resonance energy. The initial 1s exciton gas density was estimated to reach up to 10 20 cm —3 . The resulting differential absorption spectrum revealed a pronounced screening of the yellow n p absorption lines, up to complete disappearance of the 2p exciton for the highest pump intensity. On the other hand, no change in the n = 1 phonon‐assisted absorption continuum was detected, showing that the Mott condition for dissociation into a two‐component plasma was not reached for the n = 1 excitons.