Authors: F. Bras; S. Sauvage; P. Boucaud; J-M Ortega; J-M Gérard

Source: Semiconductor Science and Technology, Volume 20, Number 3, March 2005 , pp. L10-L13(4)

Publisher: IOP Publishing

Abstract:

We have investigated by pump–probe spectroscopy the spectral and power dependences of the polaron decay in n-doped InAs/GaAs self-assembled quantum dots. The polaron which results from the strong coupling for the electron–phonon interaction in the dots is studied in the spectral range between 58 and 64 meV. We show that besides the initial polaron decay which occurs on a ~30 ps time scale, a component with a long decay time appears in the pump–probe measurements. The amplitude of this component depends both on the excitation wavelength and on the excitation power density. We show that the amplitude of the long-lived component is close to zero at the resonance wavelength of the polaron absorption. We propose that the origin of this long-lived component is associated with the interaction of the exciting field with the bulk phonons of the substrate.

Document Type: Research article

DOI: http://dx.doi.org/10.1088/0268-1242/20/3/L03

Publication date: 2005-03-01

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• In this Subject: Electrical & Nuclear Engineering ,  Electricity & Magnetism
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