Intersublevel Polaron Dephasing in Self-Assembled Quantum Dots
Mesoscale and Nanoscale Physics
2009-11-13 v1 Materials Science
Abstract
Polaron dephasing processes are investigated in InAs/GaAs dots using far-infrared transient four wave mixing (FWM) spectroscopy. We observe an oscillatory behaviour in the FWM signal shortly (< 5 ps) after resonant excitation of the lowest energy conduction band transition due to coherent acoustic phonon generation. The subsequent single exponential decay yields long intraband dephasing times of 90 ps. We find excellent agreement between our measured and calculated FWM dynamics, and show that both real and virtual acoustic phonon processes are necessary to explain the temperature dependence of the polarization decay.
Cite
@article{arxiv.0710.5095,
title = {Intersublevel Polaron Dephasing in Self-Assembled Quantum Dots},
author = {E. A. Zibik and T. Grange and B. A. Carpenter and R. Ferreira and G. Bastard and N. Q. Vinh and P. J. Phillips and M. J. Steer and M. Hopkinson and J. W. Cockburn and M. S. Skolnick and L. R. Wilson},
journal= {arXiv preprint arXiv:0710.5095},
year = {2009}
}
Comments
10 pages, 4 figures, submitted to Phys Rev Lett