Emission Process in Quantum-Structures

  • Erich Gornik
Part of the NATO ASI Series book series (NSSB, volume 214)


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.


Drift Velocity Population Inversion Solid State Electron Periodic Potential Free Electron Laser 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • Erich Gornik
    • 1
  1. 1.Walter Schottky InstitutTU MünchenGarching, Am CoulombwallGermany

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