Homogeneous Linewidths in the Optical Spectrum of a Single Gallium Arsenide Quantum Dot
The homogeneous linewidths in the photoluminescence excitation spectrum of a single, naturally formed gallium arsenide (GaAs) quantum dot have been measured with high spatial and spectral resolution. The energies and linewidths of the homogeneous spectrum provide a new perspective on the dephasing dynamics of the exciton in a quantum-confined, solid-state system. The origins of the linewidths are discussed in terms of the dynamics of the exciton in zero dimensions, in particular, in terms of lifetime broadening through the emission or absorption of phonons and photons.
Gammon
D
Naval Research Laboratory, Washington, DC 20375, USA.
Snow
ES
Shanabrook
BV
Katzer
DS
Park
D