Title :
Ultrafast exciton dephasing in PbS colloidal quantum dots
Author :
Masia, Francesco ; Moreels, Iwan ; Hens, Zeger ; Langbein, Wolfgang ; Borri, Paola
Author_Institution :
Sch. of Biosci., Cardiff Univ., Cardiff, UK
Abstract :
In this work, we have measured the ground state excitonic dephasing in PbS QDs of sizes from 3.7nm to 5.7nm diameter in the temperature range from 5K to 100K by transient degenerate four-wave mixing (FWM) using 100fs pulses. A combination of heterodyne and k-selection detection was implemented to increase sensitivity and enable 4 orders of magnitude dynamic range in the FWM field detection.
Keywords :
colloids; excitons; lead compounds; multiwave mixing; FWM field detection; PbS; colloidal quantum dots; heterodyne detection; k-selection detection; transient degenerate four-wave mixing; ultrafast exciton dephasing; Excitons; Lead; Nanocrystals; Phonons; Quantum dots; Temperature measurement; Transient analysis;
Conference_Titel :
Lasers and Electro-Optics Europe (CLEO EUROPE/EQEC), 2011 Conference on and 12th European Quantum Electronics Conference
Conference_Location :
Munich
Print_ISBN :
978-1-4577-0533-5
Electronic_ISBN :
Pending
DOI :
10.1109/CLEOE.2011.5943583
