Evidence of giant oscillator strength in the exciton dephasing of CdSe nanoplatelets measured by resonant four-wave mixing

Abstract

We measured the intrinsic ground-state exciton dephasing and population dynamics in colloidal quasi two-dimensional (2D) CdSe nanoplatelets at low temperature (5-50K) using transient resonant four-wave mixing in heterodyne detection. Our results indicate that below 20K the exciton dephasing is lifetime limited, with the exciton population lifetime being as fast as 1ps. This is consistent with an exciton lifetime given by a fast radiative decay due to the large in-plane coherence area of the exciton center-of-mass motion in these quasi 2D systems compared to spherical nanocrystals.

References in corpus (2)

• Resonance fluorescence from a coherently driven semiconductor quantum dot in a cavity
• Femtosecond phase-resolved microscopy of plasmon dynamics in individual gold nanospheres

Cited by in corpus (5)

• Excitons in core-only, core-shell and core-crown CdSe nanoplatelets: interplay between in-plane electron-hole correlation, spatial and dielectric confinement
• Strong exciton-photon coupling with colloidal nanoplatelets in an open microcavity
• Nanoplatelets as material system between strong confinement and weak confinement
• Separating Pathways in Double-Quantum Optical Spectroscopy Reveals Excitonic Interactions
• Dynamics of resonantly excited excitons in MoSe${}_2$ and WS${}_2$ single-layers monitored with four-wave mixing