Simulation of transport and gain in quantum cascade lasers

WACKER, A., LEE, S.-C. and PEREIRA, Mauro (2003). Simulation of transport and gain in quantum cascade lasers. In: KRAMER, Bernhard, (ed.) Advances in Solid State Physics. Berlin, Springer Berlin Heidelberg, 369-382.

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Official URL: http://dx.doi.org/10.1007/978-3-540-44838-9_26
Link to published version:: 10.1007/978-3-540-44838-9_26

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.

Item Type: Book Section
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1007/978-3-540-44838-9_26
Depositing User: Helen Garner
Date Deposited: 19 Nov 2014 13:14
Last Modified: 19 Nov 2014 13:14
URI: http://shura.shu.ac.uk/id/eprint/8821

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