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Applied Physics Letters / Volume 95 / Issue 23 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 95, 231111 (2009); http://dx.doi.org/10.1063/1.3272675 (3 pages)

Nonequilibrium many body theory for quantum transport in terahertz quantum cascade lasers

T. Schmielau and M. F. Pereira, Jr.

Materials and Engineering Research Institute, Sheffield Hallam University, Howard Street, Sheffield S1 1WB, United Kingdom

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(Received 10 October 2009; accepted 18 November 2009; published online 10 December 2009)

This paper presents a predictive Keldysh nonequilibrium many body Green’s functions theory for quantum transport including high order electron-electron, electron-phonon, electron-impurity, and interface roughness scattering processes. Our approach is fully frequency and momentum dependent including nondiagonal dephasing terms in both frequency and k-space. A detailed balance between coherent and scattering processes leads to local current conservation even if a small number of states is considered. Good agreement with experiments is obtained for a terahertz quantum cascade laser.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

electron-electron scattering, electron-phonon interactions, Green's function methods, interface roughness, quantum cascade lasers

PACS

  • 42.55.Px

    Semiconductor lasers; laser diodes

  • 42.60.By

    Design of specific laser systems

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3272675

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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