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Optical microscopy as a probe of the rate limiting transport lifetime in InSb/Al1-xInxSb quantum wells

McIndo, Christopher, Hayes, David, Papageorgiou, Andreas, Hanks, L. A., Smith, George, Allford, Craig, Zhang, S, Clarke, E. M. and Buckle, Philip 2018. Optical microscopy as a probe of the rate limiting transport lifetime in InSb/Al1-xInxSb quantum wells. Journal of Physics: Conference Series 964 , 012005. 10.1088/1742-6596/964/1/012005

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Abstract

Recent reports of magnetotransport measurements of InSb/Al1-xInxSb quantum well structures at low temperature (3 K) have shown the need for inclusion of a new scattering mechanism not present in traditional transport lifetime models. Observations and analysis of characteristic surface structures using differential interference contrast DIC (Nomarski) optical imaging have extracted representative average grain feature sizes for this surface structure and shown these features to be the limiting low temperature scattering mechanism. We have subsequently modelled the potential profile of these surface structures using Landauer-Büttiker tunnelling calculations and a combination of a Monte-Carlo simulation and Drude model for mobility.This model matches experimentally measured currents and mobilities at low temperatures, giving a range of possible barrier heights and widths, as well modelling the theoretical trend in mobility with temperature.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: IOP Publishing: Conference Series / Institute of Physics (IoP)
ISSN: 1742-6588
Funders: EPSRC, EPSRC
Date of First Compliant Deposit: 30 January 2018
Date of Acceptance: 26 January 2018
Last Modified: 29 May 2019 00:00
URI: http://orca.cf.ac.uk/id/eprint/108583

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