Abstract
The elementary excitations of semiconductors are governed by quantum statistics and Coulomb correlation. Both the amplitude and the phase of their nonlinear optical polarization displays a complex temporal behavior. This was experimentally demonstrated by the observation of nonlinear dynamics of the instantaneous-frequency of coherent wave mixing resonant with excitons.1 However, the continuum-states, well above the band gap, are much more difficult to study because of the ultrafast relaxation of electrons and holes (e–h).2,3 In this paper we address for the first time the question of the phase dynamics in the continuum of states of quasi-free e–h.
© 1994 Optical Society of America
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