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Excitonic Molecule Transitions in ZnO
Author(s) -
Hvam J. M.
Publication year - 1979
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.2220930216
Subject(s) - exciton , excitation , polariton , absorption (acoustics) , resonance (particle physics) , spectroscopy , atomic physics , spectral line , absorption spectroscopy , molecule , photon , molecular physics , materials science , physics , optoelectronics , condensed matter physics , optics , quantum mechanics , astronomy
By means of excitation spectroscopy, the M‐band emission in ZnO is identified to be mainly due to decay of excitonic molecules (EM) into longitudinal B excitons and upper B polaritons. The latter process is easily stimulated and gives rise to a band (M 2 ) of positive optical gain. Formation of EM by two‐photon resonance absorption and by induced absorption is observed in excitation spectra as well as directly in transmission. From the experiments the EM energy is deduced to E M = 6.740 eV.