Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.742223
Title: Thermoelectric transport in the Quantum Hall regime
Author: Asman, Poppy
ISNI:       0000 0004 7227 7092
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 2017
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Abstract:
This research develops a theoretical model to explain the behaviour of the thermo-power in the quantum Hall regime. It uses the concept that at low temperatures the transport through the system will be caused by thermal activation as well as that caused by the conductance. The model is built up in stages, starting with proving the assumption that Dykhne's theorem will work for an asymmetric distribution of particle transport through the system and deriving the behaviour of the particles in the edge states of the system. It then combines this information with a previously developed simple model for the bulk of the modulation-doped GaAs/AlGaAs heterostructure and compares this with experimental data. This reveals that this simple system is not a viable model to represent the data, and as such the model is made more complex with the inclusion of tunnelling. The different parameters which describe the model are found, the saddle energy gap , the transition value for the edge states c, the current splitting parameter and the tunnelling parameter . This is done either by extracting them from the experimental data, or in the case of considering it as a free parameter. How these values vary with the temperature is investigated before a comparison of the theoretical model including tunnelling is conducted with the experimental data. The result from the comparison show a promising alignment between the model and experiment, and further work is proposed where is no longer considered a constant.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.742223  DOI: Not available
Keywords: QC Physics
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