Emission characterization of a single CdSe-ZnS nanocrystal with high temporal and spectral resolution by photon-correlation fourier spectroscopy

L. Coolen (1) , X. Brokmann (2) , P. Spinicelli (2) , J. -P. Hermier

1 INSP - Institut des Nanosciences de Paris
2 LKB (Lhomond) - Laboratoire Kastler Brossel

We report a spectroscopic study of single colloidal CdSe/ZnS nanocrystals at low temperature. We use photon-correlation Fourier spectroscopy, a technique based on measuring the correlations of the intensities detected at the outputs of a Michelson interferometer. Spectral diffusion over a few mu eV is evidenced, on a typical time scale of 200 mu s. A time resolution as high as 20 mu s is obtained, and an upper limit of 6.5 mu eV emission linewidth is measured, corresponding to a coherence time of at least 200 ps, similar to the values for epitaxial quantum dots.

Domaines: Matière Condensée [cond-mat]

L. Coolen, X. Brokmann, P. Spinicelli, J. -P. Hermier. Emission characterization of a single CdSe-ZnS nanocrystal with high temporal and spectral resolution by photon-correlation fourier spectroscopy. Physical Review Letters, 2008, 100 (2), pp.027403. ⟨10.1103/PhysRevLett.100.027403⟩. ⟨hal-01281538⟩