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Simulation of Transport and Gain in Quantum Cascade Lasers

  • A. Wacker
  • S.-C. Lee
  • M. F. PereiraJr.
Chapter
Part of the Advances in Solid State Physics book series (ASSP, volume 43)

Abstract

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. Here we present a quantum transport approach based on nonequilibrium Green functions. This allows for quantitative simulations of the transport and optical gain of the device. The division of the current density in two terms shows that semiclassical transitions are likely to dominate the transport for the prototype device of Sirtori et al. but not for a recent THz-laser with only a few layers per period. The many particle effects are extremely dependent on the design of the heterostructure, and for the case considered here, inclusion of electron-electron interaction at the Hartree Fock level, provides a sizable change in absorption but imparts only a minor shift of the gain peak.

Keywords

Green Function Quantum Cascade Laser Semiclassical Approximation Gain Spectrum Wannier Function 
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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Authors and Affiliations

  • A. Wacker
    • 1
  • S.-C. Lee
    • 1
  • M. F. PereiraJr.
    • 1
  1. 1.Institut für Theoretische PhysikTechnische Universität BerlinBerlinGermany

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