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Quantized Transmission in an Asymmetrically Biased Quantum Point Contact
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this project work we have studied how a two-dimensional electron gas (2DEG) in a GaAs/AlGaAs semiconductor heterostructure can be locally confined down to a narrow bottleneck constriction called a quantum point contact (QPC) and form an artificial quantum wire using a split-gate technique by application of negative bias voltages. The electron transport through the QPC and how asymmetric loading of bias voltages affects the nature of quantized conductance were studied. The basis is Thomas-Fermi simulations that within the Büttiker model give results somewhat similar to experimental work in aspects regarding electron density effects. An extension of the model to include exchange and correlation interaction was investigated, as well as compared to density functional theory.

Place, publisher, year, edition, pages
2016. , p. 82
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Other Physics Topics
Identifiers
URN: urn:nbn:se:liu:diva-133185ISRN: LITH-IFM-A-EX--16/3274--SEOAI: oai:DiVA.org:liu-133185DiVA, id: diva2:1055922
Subject / course
Physics
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Available from: 2016-12-14 Created: 2016-12-13 Last updated: 2016-12-14Bibliographically approved

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