Relaxation of nonthermal hh and lh excitons in ZnSe quantum wells

Kalt, H., Hoffmann, J., Umlauf, M., Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 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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Abstract

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:	28 Oct 2022 08:46
URI:	https://orca.cardiff.ac.uk/id/eprint/72109

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