Intersublevel Polaron Dephasing in Self-Assembled Quantum Dots

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.

10 pages, 4 figures, submitted to Phys Rev Lett

References in corpus (3)

• Dephasing in Quantum Dots: Quadratic Coupling to Acoustic Phonons
• Quantum Computation with Quantum Dots and Terahertz Cavity Quantum Electrodynamics
• Phonon-induced Exciton Dephasing in Quantum Dot Molecules

Cited by in corpus (4)

• Decoherence in quantum dots due to real and virtual transitions: a non-perturbative calculation
• Theory of phonon-mediated relaxation in doped quantum dot molecules
• Dephasing of InAs quantum dot p-shell excitons using two-dimensional coherent spectroscopy
• Controlling electronic and adiabatic isolation of quantum dots from the substrate: An ionization-energy theoretic study