Magnetotransport in Novel Low-dimensional Carbon Nanomaterials
Magnetotransport in Novel Low-dimensional Carbon Nanomaterials

Author: Dirk Obergfell

Publisher: VDM Publishing

Published: 2009

Total Pages: 208

ISBN-13: 9783838106007

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Several novel low-dimensional carbon nanomaterials, scilicet graphene mono- and bilayers, single-walled carbon nanotubes (SWNTs) and SWNTs filled with Dy@C82 endohedral metallofullerenes (metallofullerene peapods), were investigated by electrical magnetotransport measurements at low temperatures in external magnetic fields of different orientations. The highlights of this study are that for both SWNTs and metallofullerene peapods, significant negative magnetoresistance (approx. 8 to 14 %) could be observed for axially oriented magnetic fields in some of the samples, where this effect vanished for the perpendicular magnetic field orientation. Other nanotubes did not show this effect at all. We assign the clearly different magnetotransport of the nanotubes in the parallel magnetic field configuration to different chiralities. Moreover, height undulations of the differential conductance Coulomb blockade peaks of SWNTs accompanied by shifts of the respective peak positions along the gate voltage direction were observed. Great importance was attached to combining the magnetotransport measurements with further investigations as high-resolution TEM or AFM on the very same sample.

Magnetism in Carbon Nanostructures
Magnetism in Carbon Nanostructures

Author: Frank Hagelberg

Publisher: Cambridge University Press

Published: 2017-07-13

Total Pages: 435

ISBN-13: 1108210317

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Magnetism in carbon nanostructures is a rapidly expanding field of current materials science. Its progress is driven by the wide range of applications for magnetic carbon nanosystems, including transmission elements in spintronics, building blocks of cutting-edge nanobiotechnology, and qubits in quantum computing. These systems also provide novel paradigms for basic phenomena of quantum physics, and are thus of great interest for fundamental research. This comprehensive survey emphasizes both the fundamental nature of the field, and its groundbreaking nanotechnological applications, providing a one-stop reference for both the principles and the practice of this emerging area. With equal relevance to physics, chemistry, engineering and materials science, senior undergraduate and graduate students in any of these subjects, as well as all those interested in novel nanomaterials, will gain an in-depth understanding of the field from this concise and self-contained volume.

Magnetism and Spintronics in Carbon and Carbon Nanostructured Materials
Magnetism and Spintronics in Carbon and Carbon Nanostructured Materials

Author: Sekhar Chandra Ray

Publisher: Elsevier

Published: 2020-01-15

Total Pages: 241

ISBN-13: 0128176814

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Magnetism and Spintronics in Carbon and Carbon Nanostructured Materials offers coverage of electronic structure, magnetic properties and their spin injection, and the transport properties of DLC, graphene, graphene oxide, carbon nanotubes, fullerenes, and their different composite materials. This book is a valuable resource for those doing research or working with carbon and carbon-related nanostructured materials for electronic and magnetic devices. Carbon-based nanomaterials are promising for spintronic applications because their weak spin-orbit (SO) coupling and hyperfine interaction in carbon atoms entail exceptionally long spin diffusion lengths (~100μm) in carbon nanotubes and graphene. The exceptional electronic and transport features of carbon nanomaterials could be exploited to build multifunctional spintronic devices. However, a large spin diffusion length comes at the price of small SO coupling, which limits the possibility of manipulating electrons via an external applied field. Assesses the relative utility of a variety of carbon-based nanomaterials for spintronics applications Analyzes the specific properties that make carbon and carbon nanostructured materials optimal for spintronics and magnetic applications Discusses the major challenges to using carbon nanostructured materials as magnetic agents on a mass scale

Interaction and Transport in Low-dimensional Carbon Nanostructures
Interaction and Transport in Low-dimensional Carbon Nanostructures

Author: Lingfeng M. Zhang

Publisher:

Published: 2010

Total Pages: 200

ISBN-13: 9781124187020

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Mono and bilayer graphene are novel carbon materials with many remarkable properties. Their electronic properties, including the basic band structure, can be tuned by electrostatic gating. Calculation of the effect of the gate requires solving self-consistent screening problem. An overview of the electronic properties of graphene system is given in Chapter 1. Chapter 2 illustrates the physics of Dirac fermion on the example of a graphene p-n junction. The results are shown to be essential for experimental verification of Klein tunneling in graphene. Chapter 3 discusses the effect of gating on bilayer graphene and how their signatures have been observed by the IR spectroscopy. Chapter 4 discusses the theory of semiclassical Landau quantization in bilayer subject to both electric and magnetic fields. This explains the role of the Berry phase, valley polarization.