Phonon confinement and plasmon-phonon interaction in nanowire based quantum wells

Bernt Ketterer, Jordi Arbiol, Anna Fontcuberta i Morral

Published 2011-01-25, updated 2011-05-12Version 2

Resonant Raman spectroscopy is realized on closely spaced nanowire based quantum wells. Phonon quantization consistent with 2.4 nm thick quantum wells is observed, in agreement with cross-section transmission electron microscopy measurements and photoluminescence experiments. The creation of a high density plasma within the quantized structures is demonstrated by the observation of coupled plasmon-phonon modes. The density of the plasma and thereby the plasmon-phonon interaction is controlled with the excitation power. This work represents a base for further studies on confined high density charge systems in nanowires.