title: Infinite-order excitonic BLOCH equations for asymmetric nanostructures.
abstract: We present a new exciton-based formalism for calculating the coherent response of asymmetric semiconductor multiple quantum well structures to ultrashort optical pulses valid to infinite order in the optical field and including the self-generated intraband fields. We use these equations to calculate and explain the oscillations with time delay of peaks in the spectrally resolved degenerate four-wave mixing signals from biased semiconductor superlattices, obtaining good agreement with experiment.
authors.affiliation: Department of Physics, Lakehead University, Thunder Bay, Ontario, Canada P7B 5E1.
authors.forename: M
authors.initials: M
authors.lastname: Hawton
authors.forename: M M
authors.initials: MM
authors.lastname: Dignam