Abstract
Recent experiments investigating quantum kinetic phenomena in semiconductors via transmission spectroscopy with a time resolution in the 10 fs range are reviewed. The weak coupling regime is represented by the emission of LO phonons by highly energetic electrons in GaAs: Energy conservation is found to be violated on a time scale shorter than the phonon oscillation period. As time proceeds, quantum kinetic memory effects drive the system towards a state which is expected in semiclassical physics, thus restoring the conservation law. As an example for intermediate electron-phonon coupling, heavy holes in CdTe are investigated which are photoexcited with an excess energy below the emission threshold of LO phonons. It is demonstrated that the free particle energy ceases to be a constant of motion even in the long-time limit if the polaron self-energy becomes comparable to the LO phonon energy. The heavy hole distribution is broadened due to the formation of a cloud of virtual phonons around the bare particle.
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Leitenstorfer, A., Betz, M., Fürst, C., Göger, G. (2001). Quantum Kinetic Effects in Semiconductors Studied via Femtosecond Transmission Measurements. In: Kramer, B. (eds) Advances in Solid State Physics. Advances in Solid State Physics Volume 41, vol 41. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44946-9_10
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