Intersublevel Polaron Dephasing in Self-Assembled Quantum Dots

Details Intersublevel Polaron Dephasing in Self-Assembled Quantum Dots Intersublevel Polaron Dephasing in Self-Assembled Quantum Dots

2007-10-26

arxiv.org/abs/0710.5095v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 4 figures, submitted to Phys Rev Lett

Scientific paper

10.1103/PhysRevB.77.041307

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.

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