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Relaxation of nonthermal hh and lh excitons in ZnSe quantum wells

Kalt, H., Hoffmann, J., Umlauf, M., Langbein, Wolfgang Werner and Hvam, J. M. 1998. Relaxation of nonthermal hh and lh excitons in ZnSe quantum wells. physica status solidi (b) 206 (1) , pp. 103-109. 10.1002/(SICI)1521-3951(199803)206:1<103::AID-PSSB103>3.0.CO;2-O

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The strong exciton–LO phonon coupling in ZnSe QWs gives a direct access to the relaxation dynamics of nonthermal, free heavy-hole and light-hole excitons. Narrow hot-exciton distributions can be generated by LO-phonon assisted exciton formation. The thermalization of these excitons is monitored by cw or time-resolved phonon-sideband spectroscopy. A thermal exciton distribution evolves on a 100 ps timescale at low exciton densities when only scattering with acoustic phonons is possible. Exciton–exciton scattering accelerates the relaxation dynamics at high densities. Filling of the free heavy-hole exciton states and thermal population of the light-hole exciton states is observed. Measurements of the polarization degree after excitation with a σ+-polarized picosecond pulse show that light-hole excitons with zero in-plane momentum change sign of their spin with each emission of an LO phonon.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Wiley
ISSN: 1521-3951
Last Modified: 04 Jun 2017 08:02

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