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On the coherence/incoherence of electron transport in semiconductor heterostructure optoelectronic devices

Harrison, P., Indjin, D., Savic, I., Ikonic, Z., Evans, C.A., Vukmirovic, N., Kelsall, R.W., McTavish, J., Jovanovic, J.D. and Milanovic, V. (2008) On the coherence/incoherence of electron transport in semiconductor heterostructure optoelectronic devices. In: Belyanin, A.A. and Smowton, P.M., (eds.) Novel In-Plane Semiconductor Lasers VII. Novel In-Plane Semiconductor Lasers VII, 21 January 2008, San Jose, CA, USA. Proceedings of SPIE (6909). The International Society for Optical Engineering , p. 690912.

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Abstract

This paper compares and contrasts different theoretical approaches based on incoherent electron scattering transport with experimental measurements of optoelectronic devices formed from semiconductor heterostructures. The Monte Carlo method which makes no a priori assumptions about the carrier distribution in momentum or phase space is compared with less computationally demanding energy-balance rate equation models which assume thermalised carrier distributions. It is shown that the two approaches produce qualitatively similar results for hole transport in p-type Si1-xGex/Si superlattices designed for terahertz emission. The good agreement of the predictions of rate equation calculations with experimental measurements of mid- and far-infrared quantum cascade lasers, quantum well infrared photodetectors and quantum dot infrared photodetectors substantiate the assumption of incoherent scattering dominating the transport in these quantum well based devices. However, the paper goes on to consider the possibility of coherent transport through the density matrix method and suggests an experiment that could allow coherent and incoherent transport to be distinguished from each other.

Item Type: Proceedings Paper
Copyright, Publisher and Additional Information: © 2008 SPIE. This is an author produced version of a paper published in Proceedings of SPIE. Uploaded in accordance with the publisher's self archiving policy.
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Microwaves and Photonics (Leeds)
Depositing User: Sherpa Assistant
Date Deposited: 13 Mar 2009 18:07
Last Modified: 08 Feb 2013 17:06
Published Version: http://dx.doi.org/10.1117/12.762648
Status: Published
Publisher: The International Society for Optical Engineering
Identification Number: 10.1117/12.762648
URI: http://eprints.whiterose.ac.uk/id/eprint/7974

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