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

McIndo, Christopher and Hayes, David and Papageorgiou, Andreas and Hanks, Laura and Smith, George and Allford, Craig and Zhang, Shiyong and Clarke, Edmund 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. ISSN 1742-6588

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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:
Journal Article
Journal or Publication Title:
Journal of Physics: Conference Series
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
126074
Deposited By:
Deposited On:
12 Jul 2018 11:20
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Oct 2020 08:11