Charge and spin transport in monolayer and few-layer graphene nanostructures

In this thesis, charge and spin transport experiments on monolayer and few-layer graphene are presented. The research revolves around fabrication and understanding the fundamental properties of graphene. Magneto transport measurements suggest that a gap is generated due to the Landau level splitting...

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Main Author: Liu, Yanping
Other Authors: Lew Wen Siang
Format: Theses and Dissertations
Language:English
Published: 2013
Subjects:
Online Access:http://hdl.handle.net/10356/52958
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-529582023-02-28T23:31:43Z Charge and spin transport in monolayer and few-layer graphene nanostructures Liu, Yanping Lew Wen Siang School of Physical and Mathematical Sciences DRNTU::Science::Physics::Electricity and magnetism In this thesis, charge and spin transport experiments on monolayer and few-layer graphene are presented. The research revolves around fabrication and understanding the fundamental properties of graphene. Magneto transport measurements suggest that a gap is generated due to the Landau level splitting. In further experiments, graphene nanomesh was fabricated by etching monolayer sheets into small mesh (diameter 40~60 nm) and the resistance dependence on the magnetic field and temperature are studied. The first report of a weak localization (WL) effect in monolayer graphene nanomesh is presented. The observed WL is evidence of lattice defects in graphene nanomesh acting as resonant scatterers that contribute to the intervalley scattering. Lastly, graphene-based spin valve devices with a ferromagnetic-MgO-graphene (F/I/G) structure in lateral geometry were fabricated for the investigation of the spin transport properties. The first observation of a long spin diffusion length of 2.0 μm in trilayer graphene is presented in this thesis. The observed results indicate that trilayer graphene is a promising candidate for application in spintronic devices. ​Doctor of Philosophy (SPMS) 2013-05-29T05:46:38Z 2013-05-29T05:46:38Z 2013 2013 Thesis http://hdl.handle.net/10356/52958 en 197 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Physics::Electricity and magnetism
spellingShingle DRNTU::Science::Physics::Electricity and magnetism
Liu, Yanping
Charge and spin transport in monolayer and few-layer graphene nanostructures
description In this thesis, charge and spin transport experiments on monolayer and few-layer graphene are presented. The research revolves around fabrication and understanding the fundamental properties of graphene. Magneto transport measurements suggest that a gap is generated due to the Landau level splitting. In further experiments, graphene nanomesh was fabricated by etching monolayer sheets into small mesh (diameter 40~60 nm) and the resistance dependence on the magnetic field and temperature are studied. The first report of a weak localization (WL) effect in monolayer graphene nanomesh is presented. The observed WL is evidence of lattice defects in graphene nanomesh acting as resonant scatterers that contribute to the intervalley scattering. Lastly, graphene-based spin valve devices with a ferromagnetic-MgO-graphene (F/I/G) structure in lateral geometry were fabricated for the investigation of the spin transport properties. The first observation of a long spin diffusion length of 2.0 μm in trilayer graphene is presented in this thesis. The observed results indicate that trilayer graphene is a promising candidate for application in spintronic devices.
author2 Lew Wen Siang
author_facet Lew Wen Siang
Liu, Yanping
format Theses and Dissertations
author Liu, Yanping
author_sort Liu, Yanping
title Charge and spin transport in monolayer and few-layer graphene nanostructures
title_short Charge and spin transport in monolayer and few-layer graphene nanostructures
title_full Charge and spin transport in monolayer and few-layer graphene nanostructures
title_fullStr Charge and spin transport in monolayer and few-layer graphene nanostructures
title_full_unstemmed Charge and spin transport in monolayer and few-layer graphene nanostructures
title_sort charge and spin transport in monolayer and few-layer graphene nanostructures
publishDate 2013
url http://hdl.handle.net/10356/52958
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