Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 121, Issue 20, Pages 10104-10110Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1808414
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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 (c) electron spin state flip kinetics can be probed directly in an isotropic quantum dot system by using certain sequences of linear cross-polarized pulses. (C) 2004 American Institute of Physics.
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