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Time- and spectrally-resolved four-wave mixing in single CdTe/ZnTe quantum dots

Patton, Brian, Langbein, Wolfgang Werner, Woggon, U., Maingault, L. and Mariette, H. 2006. Time- and spectrally-resolved four-wave mixing in single CdTe/ZnTe quantum dots. Physical Review B: Condensed Matter and Materials Physics 73 (23) , 235354. 10.1103/PhysRevB.73.235354

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We present transient four-wave mixing experiments on individual excitonic transitions in self-assembled CdTe∕ZnTe quantum dots. Using a two-dimensional femtosecond spectroscopy and heterodyne detection of the nonlinear signal we study the dephasing and mutual coherent coupling of single quantum dot states. For the homogeneous linewidth of the zero-phonon line (ZPL) values of 0.06–0.1 meV (T2=13–20 ps) are measured, and a ZPL weight in the total line shape of Z=0.9 at T=7 K is estimated. We observe two linearly polarized fine-structure split exciton transitions with transition dipole moment ratios of 1.0–1.1 deduced from the four-wave mixing (FWM) amplitude, and splitting energies of 0.2–0.35 meV deduced from the FWM spectral response or quantum beat period. Coherent coupling between excitonic states is identified by off-diagonal signals in the two-dimensional spectrally-resolved FWM. The presence of an inhomogeneous broadening caused by spectral diffusion in the time ensemble is evidenced by the formation of a photon echo in the time-resolved FWM from a single transition.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: American Physical Society
ISSN: 1098-0121
Last Modified: 04 Jun 2017 05:09

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