Detecting strain wave propagation through quantum dots by pump-probe spectroscopy : A theoretical analysis

Title data

Huneke, Jan ; Kuhn, Tilmann ; Axt, Vollrath Martin:
Detecting strain wave propagation through quantum dots by pump-probe spectroscopy : A theoretical analysis.
In: Journal of Physics: Conference Series. Vol. 210 (2010) Issue 1 . - 012013.
ISSN 1742-6596
DOI: https://doi.org/10.1088/1742-6596/210/1/012013

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Abstract in another language

The influence of strain waves traveling across a quantum dot structure on its optical response is studied for two different situations: First, a strain wave is created by the optical excitation of a single quantum dot near a surface which, after reflection at the surface, reenters the dot; second, a phonon wave packet is emitted by the excitation of a nearby second dot and then travels across the quantum dot. Pump-probe type excitations are simulated for quantum dots in the strong confinement limit. We show that the optical signals allow us to monitor crossing strain waves for both structures in the real-time response as well as in the corresponding pump-probe spectra. In the time-derivative of the phase of the polarization a distinct trace reflects the instantaneous shifts of the transition energy during the passage while in the spectra pronounced oscillations reveal the passage of the strain waves.