Spectral hole burning of strongly confined CdSe quantum dots

The paper presents ns-hole-burning experiments of the quantum-confined transitions in CdSe quantum dots. By means of respective model calculations the contribution of inhomogeneous and homogeneous broadening of the spectra are deduced at 77 K and room temperature. Tuning the excitation wavelength over a broad spectral range demonstrates a common blocking of three electronic states about 160 meV apart.