Antti-Pekka Jauho and Andreas Wacker (now at TU-Berlin) have developed microscopic theories for charge transport in superlattices and multiple quantum wells. Their approach allows a detailed description of various physical mechanisms, such as surface roughness scattering or disorder caused due to doping impurities. Impurity bands have been shown to play a significant role in photon-assisted transport for low doped samples. Recently, a quantum theory of transport was proposed, which reduces to earlier theories in the appropriate limits, but, more importantly, allows one to define the limits of validity of standard theories, and to treat hitherto unaccessible regions in parameter space. The the quantum theory has been extended to include inelastic scattering, e.g., due to acoustic phonons, and compared to corresponding Boltzmann equation simulation. The next challenge will be to address the time-dependent situation, i.e., develop a fully quantum mechanical theory of photon-assisted transport in superlattices.
|Effective start/end date||01/01/1997 → 31/12/2000|
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