Dresden 2003 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 23: Symposium Quantenkaskadenlaser
HL 23.5: Vortrag
Dienstag, 25. März 2003, 17:15–17:45, POT/81
Simulation of tranport and gain in quantum cascade lasers — •Andreas Wacker1, S.-C. Lee1, and M. F. Pereira1,2 — 1Institut für Theoretische Physik, TU Berlin, Germany — 2NMRC, Cork, Ireland
Quantum cascade lasers can be modeled within a hierarchy of different approaches: Standard rate equations for the electron densities in the levels, semiclassical Boltzmann equation for the microscopic distribution functions, and Quantum kinetics including the coherent evolution between the states. We have developed a quantum transport approach based on nonequilibrium Green functions [1]. Next to quantitative simulations of the transport and optical gain [2] of the device, we can provide a microscopic view of the ongoing transport processes. In particular we show how negative differential conductivity can occur for high current densities. The influence of the electron-electron interaction on the gain profile is addressed as well.
[1] S.-C. Lee and A. Wacker, Physical Review B 66, in press.
[2] A. Wacker, Physical Review B 66, 085326 (2002).