title: Mott-transition-induced period doubling in transient-grating experiments in CdS.
abstract: The occurrence of higher-order Fourier components in an originally sinusoidal free-carrier index grating produced in CdS by interference of two picosecond light pulses is demonstrated by simultaneously monitoring the decay of the first- and second-order diffraction intensity of a transparent probe pulse. A pronounced contribution with doubled period can be attributed to an exciton phase grating formed by binding of electrons and holes of the free-carrier grating.
authors.affiliation: Department of Applied Physics, Okayama University of Science, Okayama 700, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Saito
authors.forename: E O
authors.initials: EO
authors.lastname: Göbel