Four-wave mixing and terahertz emission from three-level systems in quantum wells: effects of inhomogeneous broadening

Details Four-wave mixing and terahertz emission from three-level systems in quantum wells: effects of inhomogeneous broadening Four-wave mixing and terahertz emission from three-level systems in quantum wells: effects of inhomogeneous broadening

1994-11-28

arxiv.org/abs/cond-mat/9411118v1

Physics

Condensed Matter

Latex file; 4 figures available from xzhu@physics.rutgers.edu; Appeared in: PRB vol. 50 11915 (1994)

Scientific paper

10.1103/PhysRevB.50.11915

Using a perturbation theory based on the density-matrix formulation, we study the nonlinear optical responses of a noninteracting three-level model system to consecutive coherent pulsed excitations, as realized in several recent experiments involving excitonic transitions in quantum wells. The terahertz emission, which is a second order response, and the four-wave mixing signal, a third order response, are calculated within the rotating-wave approximation, in the presence of detuning, dephasing, and inhomogeneous broadening. We study the quantum beats in the photon echo from transient four-wave mixing experiments of a three-level system. We find that the temporal profile of the photon echo signal in the four-wave mixing experiments depends very strongly on the amount of inhomogeneous broadening of the energy levels involed. Both the position and the intensity of the peaks exhibit a smooth evolution from strong quantum beats to a conventional photon echo as the inhomogeneous broadening increases. These features from our noninteracting model system are compared with a recent experiment, and found to account for a number of experimental observations.

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