Carroll, Robert;
Auton, Gregory;
Holmes, Stuart N;
Chen, Chong;
Ritchie, David A;
Pepper, Michael;
(2025)
The Hall effect and localized transport.
Applied Physics Letters
, 127
(22)
, Article 222104. 10.1063/5.0305525.
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Abstract
Historically, in measurements of electron transport in disordered two-dimensional systems, an Arrhenius Hall carrier density has never been observed alongside an Arrhenius conductivity, when the Fermi level is below a mobility edge. This has long been an issue with respect to claiming observation of transport via activation to a mobility edge. In this work, an Arrhenius conductivity and Arrhenius Hall carrier density have been observed alongside one another in such a system. Measurements were made of a two-dimensional electron gas hosted in a gated GaAs/Al0.33Ga0.67As heterostructure. Furthermore, in the regime of Arrhenius conductivity and Arrhenius carrier density, the mobility is shown to be independent of the position of the Fermi level below the mobility edge. A transition between carrier density and mobility dominating the resistivity temperature dependence has been observed, as the Fermi level is varied.
| Type: | Article |
|---|---|
| Title: | The Hall effect and localized transport |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/5.0305525 |
| Publisher version: | https://doi.org/10.1063/5.0305525 |
| Language: | English |
| Additional information: | Copyright © 2025 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS 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/10218608 |
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