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Photon echo studies of biexcitons and coherences in colloidal CdSe quantum dots
Author(s) -
Colonna Anne E.,
Yang Xiujuan,
Scholes Gregory D.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200402122
Subject(s) - biexciton , quantum dot , photon , colloid , physics , polarization (electrochemistry) , echo (communications protocol) , quantum , homogeneous , nonlinear system , condensed matter physics , molecular physics , quantum mechanics , materials science , atomic physics , chemistry , statistical physics , computer network , computer science
Nonlinear optical properties of colloidal quantum dots are studied to elucidate the significance and nature of many‐body effects. Two‐pulse photon echo studies of nanocrystalline CdSe quantum dots are reported for samples dispersed in a poly(butylmethacrylate) film (4.4 K). Oscillations are observed in the experimental data that are attributed to 1 S 3/2 1 S e –2 S 3/2 1 S e biexciton cohererences. Signals are simulated using a phenomenological model based on the many‐body description of the dynamics (the average polarization model). It is found that the electronic coherences and the nonlinear response originating from biexciton source terms are important, but their manifestation in the photon echo signals is strongly influenced by the interplay between homogeneous and inhomogeneous line broadening. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)