# Coherent Excitonic and Free Carrier Dynamics in Bulk GaAs and Heterostructures

## Abstract

Coherent dynamics in atomic and molcular systems has been investigated for a long time. The first spin echo experiment^{1} was performed in 1950 on protons in a water solution of Fe^{+++} ions. Pulses in the radio frequency range were generated by means of a gated oscillator with pulse widths between 20 μs and a few milliseconds. With these pulses dephasing times of the order of 10 ms have been measured. In the 1960s echo experiments were brought into the visible range.^{2,3} A Q-switched ruby laser produced pulses of approximately 10 ns duration which were used to observe photon echoes from ruby. In this case the dephasing times were of the order of 100 ns. For the observation of such coherent dynamics the pulse width has to be shorter than the dephasing time. In semiconductors typical dephasing times are much shorter, they are in the range of a few picoseconds down to some femtoseconds. Therefore, experiments had to wait until the development of suitable lasers which were able to generate sub-picosecond pulses.

## Keywords

Quantum Beat Bulk GaAs Photon Echo Coherent Phonon Dephasing Time## Preview

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