Wagner, H. P. and Schätz, A. and Maier, R. and Langbein, W. and Hvam, J. M. (1997) Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons in ZnSxSe1-x/ZnSe structures. PHYSICAL REVIEW B, 56 (19). pp. 12581-12588. ISSN 0163-1829
Full text not available from this repository.Abstract
We investigate the dephasing of heavy-hole excitons in different free-standing ZnSxSe1-x/ZnSe layer structures by spectrally resolved transient four-wave mixing. ZnSe layers of 80, 8, and 4 nm thickness with ternary barriers are studied, representing the crossover from quasi-three-dimensional to quasi-two-dimensional excitons. A common feature of the four-wave-mixing signals is the appearance of two components, a prompt signature and a delayed photon echo, which are identified by their different polarization dependencies and decay times. For crosslinear polarized fields, the rapidly decaying signal is attributed to the response of spin-coupled exciton states, with a decay time given by the inhomogeneous broadening. The photon echo is due to a distribution of localized, noninteracting excitons. We determine the exciton-exciton and exciton-phonon scattering cross sections for different dimensionalities by the intensity and temperature dependencies of the exciton dephasing.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MULTIPLE-QUANTUM-WELLS; 4-WAVE-MIXING SIGNALS; POLARIZATION DEPENDENCE; PHOTON-ECHOES; GAAS; SEMICONDUCTORS; ZNSE; LINEWIDTHS; DISORDER; SPECTROSCOPY |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Mar 2023 08:43 |
| Last Modified: | 02 Mar 2023 08:43 |
| URI: | https://pred.uni-regensburg.de/id/eprint/50411 |
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