Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Quantum dots: Optical properties II

HL 29.5: Vortrag

Mittwoch, 25. März 2009, 10:45–11:00, BEY 154

Influence of phonon confinement on optical and current spectra in nanowire-based quantum dots — •Carsten Weber and Andreas Wacker — Mathematical Physics, Lund University, Box 118, 221 00 Lund, Sweden

Recent progress in the growth of nanowire heterostructures allows the study of quantum dots embedded in semiconductor nanowires. Here, we investigate the influence of the reduced dimensionality of the quantized phonon modes on the electron-phonon coupling and compare it to the interaction with bulk phonons. In the optical spectrum, this is reflected in the form of discrete side peaks of the excitonic transition and a zero-phonon line broadening, where both the deformation potential and the piezoelectric coupling are important for different types of phonon modes. In transport signals, discrete characteristics found in the current spectra through double dot systems may be explained by the one-dimensional density of states of the phonons. We present theoretical results of electron-phonon coupling in nanowire-based quantum dots in optical and current spectra.