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Thermoelectric and electrical transport in mesoscopic two-dimensional electron gases

Narayan, V; Pepper, M; Ritchie, DA; (2016) Thermoelectric and electrical transport in mesoscopic two-dimensional electron gases. Comptes Rendus Physique , 17 (10) pp. 1123-1129. 10.1016/j.crhy.2016.08.012. Green open access

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Abstract

We review some of our recent experimental studies on low-carrier concentration, mesoscopic two-dimensional electron gases (m2DEGs). The m2DEGs show a range of striking characteristics, including a complete avoidance of the strongly localised regime even when the electrical resistivity ρ>>h/e2ρ>>h/e2, giant thermoelectric response, and an apparent decoupling of charge and thermoelectric transport. We analyse the results and demonstrate that these observations can be explained based on the assumption that the charge carriers retain phase coherence over the m2DEG dimensions. Intriguingly, this would imply phase coherence on lengthscales of up to 10 μm and temperature T up to 10 K, which is significantly greater than conventionally expected in GaAs-based 2DEGs. We critically assess this assumption and explore other possible explanations to the data. Such unprecedentedly large phase coherence lengths open up several possibilities in quantum information and computation schemes.

Type: Article
Title: Thermoelectric and electrical transport in mesoscopic two-dimensional electron gases
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.crhy.2016.08.012
Publisher version: http://dx.doi.org/10.1016/j.crhy.2016.08.012
Language: English
Additional information: © 2016 Académie des sciences. Published by Elsevier Masson SAS. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Multidisciplinary, Physics, Mesoscopic Systems, Seebeck Coefficient, Phase Coherence, Metal-Insulator-Transition, 2 Dimensions, Behavior, Conductivity, Localization, Thermopower, Conductance, Resistance
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1530718
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