The ultimate limit to the emission linewidth of single nanocrystals
Idioma
en
Article de revue
Este ítem está publicado en
Nanotechnology. 2013-10-24, vol. 24, p. 465703 (1-5)
Institute of Physics
Resumen en inglés
Measurements of the emission linewidth of single nanocrystals are usually limited by spectral diffusion. At cryogenic temperatures, the origin of this instability was revealed to be photo-induced, suggesting that the ...Leer más >
Measurements of the emission linewidth of single nanocrystals are usually limited by spectral diffusion. At cryogenic temperatures, the origin of this instability was revealed to be photo-induced, suggesting that the spectral peak position may be stable in the limit of vanishing optical excitation. Here we test this stability using resonant photoluminescence excitation and find there is persistent spectral broadening, which ultimately limits the emission linewidth in these materials. The spectral broadening is shown to be consistent with spontaneous fluctuations of the local electrostatic field within the disordered environment surrounding the nanocrystal.< Leer menos
Palabras clave en inglés
single molecule spectroscopy- spectral diffusion
band edge exciton
semiconductor nanocrystals
Orígen
Importado de HalCentros de investigación