Time-resolved photon echoes from donor-bound excitons in ZnO epitaxial layers

he coherent optical response from 140 nm and 65 nm thick ZnO epitaxial layers is studied using four-wave-mixing spectroscopy with picosecond temporal resolution. Resonant excitation of neutral donor-bound excitons results in two-pulse and three-pulse photon echoes. For the donor-bound A exciton (D0X...

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Bibliographic Details
Published in:Physical review. B 2017-07, Vol.96 (3), Article 035203
Main Authors: Poltavtsev, S. V., Kosarev, A. N., Akimov, I. A., Yakovlev, D. R., Sadofev, S., Puls, J., Hoffmann, S. P., Albert, M., Meier, C., Meier, T., Bayer, M.
Format: Article
Language:English
Subjects:
Coherence
Echoes
Epitaxial layers
Excitons
Four-wave mixing
Phonons
Temporal resolution
Zinc oxide
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Summary:he coherent optical response from 140 nm and 65 nm thick ZnO epitaxial layers is studied using four-wave-mixing spectroscopy with picosecond temporal resolution. Resonant excitation of neutral donor-bound excitons results in two-pulse and three-pulse photon echoes. For the donor-bound A exciton (D0XA) at temperature of 1.8 K we evaluate optical coherence times T2=33–50 ps corresponding to homogeneous line widths of 13–19μeV, about two orders of magnitude smaller as compared with the inhomogeneous broadening of the optical transitions. The coherent dynamics is determined mainly by the population decay with time T1=30–40 ps, while pure dephasing is negligible. Temperature increase leads to a significant shortening of T2 due to interaction with acoustic phonons. In contrast, the loss of coherence of the donor-bound B exciton (D0XB) is significantly faster (T2=3.6ps) and governed by pure dephasing processes.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.035203