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IEEE Lasers and Electro-Optics Society Annual Meeting (LEOS)

Instantaneous frequency dynamics of coherent wave mixing in semiconductor quantum wells

D. S. Chemia

Published Dec 30, 2002• 0 citations
Publisher

Abstract

Summary form only given. We resolve the femtosecond free polarization decay of excitons in GaAs quantum wells by upconverting the diffracted signal in transient four wave mixing experiments. We find that the temporal profile exhibit large deviations from that expected from isolated atomic like systems. They also represent the first observation of the dynamics of the development of a macroscopic coherence via a Ginzburgh-Landau mechanism. >

DOI
10.1109/leos.1993.379442

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Summary form only given. We resolve the femtosecond free polarization decay of excitons in GaAs quantum wells by upconverting the diffracted signal in transient four wave mixing experiments. We find that the temporal profile exhibit large deviations from that expected from isolated atomic like systems. They also represent the first observation of the dynamics of the development of a macroscopic coherence via a Ginzburgh-Landau mechanism. >
Summary form only given. Ultrafast dephasing of excitons in semiconductor quantum wells is important because it presents insight into fundamental interactions and possible coherent control of optical properties. Standard measurement techniques include time- and frequency-domain four-wave mixing, resonant Rayleigh scattering, and Faraday rotation. We report on a new time-resolved technique based on reflective probing of pump-induced transient linear birefringence. This has various advantages, including sensitivity, applicability to opaque as-grown samples, ease of implementation, and freedom from superimposed signals.
We report on the coherent dynamics of excitonic wave packets observed in transient four-wave mixing experiments on strained InGaAs/GaAs quantum-well structures. The excitonic noneigenstates are created by using laser pulses shorter than the electron round trip time within the exciton orbital. A characteristic temporal modulation of the diffracted signal is observed, which resembles the coherent dynamics of an electron wave packet in a hydrogen atom expected for the case of a simultaneous excitation of all bound and the lowest continuum states.
Coherent transient spectroscopy of semiconductor nanostructures has become an active field of research in recent years. Most such experiments are analyzed in terms of a simple two-level model in which the effects of interaction and induced fields are ignored. We discuss two very different cases where inclusion of these generally-neglected effects leads to large and important modification in the temporal response of the system. In the first case, interactions between excitons strongly modify the temporal response of four-wave-mixing (FWM) signals from quantum wells. This is the temporal analog of well-known effects in the spectral domain, such as bleaching of the exciton absorption and bandgap renormalization. In the second case, the shape of a low-intensity pulse is severely distorted after transmission through a typical quantum well sample. Interferometric measurements show that reradiation of induced polarization is responsible for the distortion. The distortion depends strongly on the dephasing time and has important implications for all time-resolved measurements. 1.