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J Chem Phys. 2004 Nov 22;121(20):10104-10.

Selection rules for probing biexcitons and electron spin transitions in isotropic quantum dot ensembles.

Author information

1
Lash-Miller Chemical Laboratories, 80 St. George Street, University of Toronto, Toronto, Ontario, M5S 3H6 Canada.

Abstract

Three-dimensional rotational averages are evaluated for third-order nonlinear spectroscopic measurements of quantum dots. Photon echo, transient grating, and transient absorption are explicitly considered. It is shown that (a) biexciton formation can be suppressed relative to other contributions to nonlinear spectroscopies for isotropic nanocrystal ensembles by choice of polarizations for the excitation pulses; (b) circularly polarized excitation light can differentiate between exciton spin states in nonlinear optical experiments; and

PMID:
15549885
DOI:
10.1063/1.1808414

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