Controlling many-body effects in the midinfrared gain and terahertz absorption of quantum cascade laser structures

PEREIRA, M. F., LEE, S. C. and WACKER, A. (2004). Controlling many-body effects in the midinfrared gain and terahertz absorption of quantum cascade laser structures. Physical review B, 69 (20), 205310-1.

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Link to published version:: 10.1103/PhysRevB.69.205310

Abstract

A many-body theory based on nonequilibrium Green functions, in which transport and optics are treated on a microscopic quantum-mechanical basis, is used to compute gain and absorption in the optical and terahertz regimes in quantum cascade laser structures. The relative importance of Coulomb interactions for different intersubband transitions depends strongly on the spatial overlap of the wave functions and the specific nonequilibrium populations within the subbands. The magnitude of the Coulomb effects can be controlled by changing the operation bias.

Item Type: Article
Additional Information: ©2004 The American Physical Society
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1103/PhysRevB.69.205310
Depositing User: Ann Betterton
Date Deposited: 07 Feb 2008
Last Modified: 05 May 2010 17:03
URI: http://shura.shu.ac.uk/id/eprint/349

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