Abstract
Different emission processes based on fundamental excitations in low dimensional systems are discussed. Subband transitions in GaAs/GaA1As heterostructures and quantum wells provide a level system which can be tuned by technological parameters. For subband energies below the optical phonon energy weak subband emission has been observed by excitation through carrier heating and tunnel injection. The tunnel injection mechanisms and the requirements for a subband laser are discussed.
Ballistic electron transport in combination with a lateral periodic potential bears the possibility to obtain stimulated emission in a semiconductor analogous to the free electron laser. A first step into this direction is demonstrated by the observation of spontaneous emission from electrons moving ballistically over a sinusoidal grating in high mobility GaAs/GaA1As heterostructures. Two—dimensional plasma oscillations are also a candidate to generate coherent far infrared radiation.
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© 1990 Plenum Press, New York
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Gornik, E. (1990). Emission Process in Quantum-Structures. In: Beaumont, S.P., Torres, C.M.S. (eds) Science and Engineering of One- and Zero-Dimensional Semiconductors. NATO ASI Series, vol 214. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5733-9_21
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DOI: https://doi.org/10.1007/978-1-4684-5733-9_21
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