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Ultrafast dynamics of confined and localized excitons in low-dimensional semiconductors

Hvam, Jorn M., Langbein, Wolfgang Werner and Borri, Paola 1999. Ultrafast dynamics of confined and localized excitons in low-dimensional semiconductors. Presented at: Conference on Ultrafast Phenomena in Semiconductors III, San Jose, CA, 27-29 January 1999. Published in: Tsen, Kong-Thon F. ed. Ultrafast Phenomena in Semiconductors III: 27-29 January, 1999, San Jose, California. SPIE Proceedings Series , vol. 3624. Bellingham, WA: The International Society for Optical Engineering (SPIE), pp. 40-48. 10.1117/12.349310

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Abstract

Coherent optical spectroscopy in the form of nonlinear transient four-wave mixing (TFWM) and linear resonant Rayleigh scattering (RRS) has been applied to investigate the exciton dynamics in low-dimensional semiconductor heterostructures. The dephasing times of excitons are determined from the decay of the spectrally resolved non-linear signal as a function of the delay between the incident pulses in a two-beam TFWM experiment, and from the real time analysis of single speckles in RRS experiments (pure dephasing). From the density- and temperature-dependence of the dephasing times the exciton-exciton and the exciton-phonon interactions are determined. The degree of coherence of the secondary emission is determined from the speckle analysis.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Biosciences
Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: The International Society for Optical Engineering (SPIE)
ISBN: 0819430943
ISSN: 0277-786X
Last Modified: 16 May 2019 23:19
URI: http://orca.cf.ac.uk/id/eprint/60266

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