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Propagation Beats of Quadrupole Polaritons in Cu 2 O
Author(s) -
Fröhlich D.,
Kulik A.,
Uebbing B.,
Langer V.,
Stolz H.,
von der Osten W.
Publication year - 1992
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.2221730104
Subject(s) - polariton , quantum beats , excited state , superposition principle , excitation , physics , quadrupole , atomic physics , transmission (telecommunications) , resonance (particle physics) , condensed matter physics , quantum mechanics , telecommunications , computer science
Abstract Time‐resolved measurements of transmission in resonance with the 1 S quadrupole polariton in Cu 2 O reveal a long‐lasting signal which is modulated by pronounced oscillations with time‐dependent period. These oscillations are interpreted as “propagation beats”, which are caused by superposition of excited states of both polariton branches which propagate coherently through the crystal. At higher excitation intensities the decay becomes faster and the beats disappear. Magneto‐quantum beats are also influenced significantly by propagation effects in transmission measurements.