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Author: Dinh Van Tuan
Publisher: Springer
ISBN: 3319255711
Category : Science
Languages : en
Pages : 162
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Book Description
This thesis presents an in-depth theoretical analysis of charge and spin transport properties in complex forms of disordered graphene. It relies on innovative real space computational methods of the time-dependent spreading of electronic wave packets. First a universal scaling law of the elastic mean free path versus the average grain size is predicted for polycrystalline morphologies, and charge mobilities of up to 300.000 cm2/V.s are determined for 1 micron grain size, while amorphous graphene membranes are shown to behave as Anderson insulators. An unprecedented spin relaxation mechanism, unique to graphene and driven by spin/pseudospin entanglement is then reported in the presence of weak spin-orbit interaction (gold ad-atom impurities) together with the prediction of a crossover from a quantum spin Hall Effect to spin Hall effect (for thallium ad-atoms), depending on the degree of surface ad-atom segregation and the resulting island diameter.
Author: Dinh Van Tuan
Publisher: Springer
ISBN: 3319255711
Category : Science
Languages : en
Pages : 162
Get Book Here
Book Description
This thesis presents an in-depth theoretical analysis of charge and spin transport properties in complex forms of disordered graphene. It relies on innovative real space computational methods of the time-dependent spreading of electronic wave packets. First a universal scaling law of the elastic mean free path versus the average grain size is predicted for polycrystalline morphologies, and charge mobilities of up to 300.000 cm2/V.s are determined for 1 micron grain size, while amorphous graphene membranes are shown to behave as Anderson insulators. An unprecedented spin relaxation mechanism, unique to graphene and driven by spin/pseudospin entanglement is then reported in the presence of weak spin-orbit interaction (gold ad-atom impurities) together with the prediction of a crossover from a quantum spin Hall Effect to spin Hall effect (for thallium ad-atoms), depending on the degree of surface ad-atom segregation and the resulting island diameter.
Author: Van Tuan Dinh
Publisher:
ISBN: 9788449046056
Category :
Languages : en
Pages : 228
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Book Description
Esta tesis está enfocada en la modelización y simulación del transporte de carga y spin en materiales bidimensionales basados en Grafeno, así como en el impacto de la policristalinidad en el rendimiento de transistores de efecto campo diseñados con este tipo de materiales. Para este estudio se ha utilizado la metodología de transporte Kubo-Greenwood, la cual presenta grandes ventajas a la hora de realizar cálculos numéricos en sistemas microscópicos con el fin de obtener las propiedades de transporte de carga. Este trabajo cubre todos los tipos de desorden que pueden tener lugar en Grafeno, desde vacantes a la posible adsorción de especies químicas a lo largo de las fronteras de grano en el caso de Grafeno policristalino. Además tiene en cuenta importantes efectos cuánticos, como las interferencias cuánticas y los efectos debidos al acoplamiento spin-órbita intrínseco y extrínseco. Para el transporte de spin, se ha desarrollado un nuevo método basado en el formalismo de transporte en espacio real de orden O(N). Este nuevo método permite explorar y entender los mecanismos de relajación de spin en Grafeno y sus derivados. A partir de esta nueva metodología ha sido posible descubrir un nuevo mecanismo de relajación de spin basado en el acoplamiento entre spin y pseudospin (en presencia de un acoplamiento spin-órbita extrínseco o Rashba) que podría ser el mecanismo principal que gobierna la rápida relajación de spin observada experimentalmente en muestras de grafeno de alta calidad.
Author: Luis E. F. Foa Torres
Publisher: Cambridge University Press
ISBN: 1108754376
Category : Science
Languages : en
Pages : 479
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Book Description
Graphene is one of the most intensively studied materials, and has unusual electrical, mechanical and thermal properties, which provide almost unlimited potential applications. This book provides an introduction to the electrical and transport properties of graphene and other two-dimensional nanomaterials, covering ab-initio to multiscale methods. Updated from the first edition, the authors have added chapters on other two-dimensional materials, spin-related phenomena, and an improved overview of Berry phase effects. Other topics include powerful order N electronic structure, transport calculations, and ac transport and multiscale transport methodologies. Chapters are complemented with concrete examples and case studies, questions and exercises, detailed appendices and computational codes. It is a valuable resource for graduate students and researchers working in physics, materials science or engineering who are interested in the field of graphene-based nanomaterials.
Author: Marc Vila Tusell
Publisher: Springer Nature
ISBN: 3030861147
Category : Technology & Engineering
Languages : en
Pages : 169
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Book Description
This thesis focuses on the exploration of nontrivial spin dynamics in graphene-based devices and topological materials, using realistic theoretical models and state-of-the-art quantum transport methodologies. The main outcomes of this work are: (i) the analysis of the crossover from diffusive to ballistic spin transport regimes in ultraclean graphene nonlocal devices, and (ii) investigation of spin transport and spin dynamics phenomena (such as the (quantum) spin Hall effect) in novel topological materials, such as monolayer Weyl semimetals WeTe2 and MoTe2. Indeed, the ballistic spin transport results are key for further interpretation of ultraclean spintronic devices, and will enable extracting precise values of spin diffusion lengths in diffusive transport and guide experiments in the (quasi)ballistic regime. Furthermore, the thesis provides an in-depth theoretical interpretation of puzzling huge measured efficiencies of the spin Hall effect in MoTe2, as well as a prediction of a novel canted quantum spin Hall effect in WTe2 with spins pointing in the yz plane.
Author: Luis E. F. Foa Torres
Publisher: Cambridge University Press
ISBN: 1107030838
Category : Science
Languages : en
Pages : 425
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Book Description
A detailed primer describing the most effective theoretical and computational methods and tools for simulating graphene-based systems.
Author: Farkhad Aliev
Publisher: CRC Press
ISBN: 1351617397
Category : Science
Languages : en
Pages : 352
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Book Description
This book covers the main physical mechanisms and the different contributions (1/f noise, shot noise, etc.) behind electronic fluctuations in various spintronic devices. It presents the first comprehensive summary of fundamental noise mechanisms in both electronic and spintronic devices and is therefore unique in that aspect. The pedagogic introduction to noise is complemented by a detailed description of how one could set up a noise measurement experiment in the lab. A further extensive description of the recent progress in understanding and controlling noise in spintronics, including the boom in 2D devices, molecular spintronics, and field sensing, is accompanied by both numerous bibliography references and tens of case studies on the fundamental aspects of noise and on some important qualitative steps to understand noise in spintronics. Moreover, a detailed discussion of unsolved problems and outlook make it an essential textbook for scientists and students desiring to exploit the information hidden in noise in both spintronics and conventional electronics.
Author: Wonbong Choi
Publisher: CRC Press
ISBN: 1439861889
Category : Science
Languages : en
Pages : 374
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Book Description
Since the late 20th century, graphene-a one-atom-thick planar sheet of sp2-bonded carbon atoms densely packed in a honeycomb crystal lattice-has garnered appreciable attention as a potential next-generation electronic material due to its exceptional properties. These properties include high current density, ballistic transport, chemical inertness,
Author: Sekhar Chandra Ray
Publisher: Elsevier
ISBN: 0128176814
Category : Technology & Engineering
Languages : en
Pages : 241
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Book Description
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
Author: Klaus D. Sattler
Publisher: CRC Press
ISBN: 1482252694
Category : Science
Languages : en
Pages : 608
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Book Description
The Carbon Nanomaterials Sourcebook contains extensive, interdisciplinary coverage of carbon nanomaterials, encompassing the full scope of the field-from physics, chemistry, and materials science to molecular biology, engineering, and medicine-in two comprehensive volumes.Written in a tutorial style, this first volume of the sourcebook:Focuses on g
Author: Klaus D. Sattler
Publisher: CRC Press
ISBN: 1482282771
Category : Science
Languages : en
Pages : 1384
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Book Description
This two-volume sourcebook is the most comprehensive reference for carbon nanomaterials, bringing together the physics, chemistry, materials science, molecular biology and engineering of all carbon nanomaterial types that are important in electronics, energy, biomedical and environmental applications. Each chapter addresses the fundamental properties, growth mechanisms, processing and functionalization of a particular nanocarbon. The first volume covers graphene, fullerenes, nanotubes and nanodiamonds. The second volume focuses on nanoparticles, nanocapsules, nanofibers, nanoporous structures and nanocomposites.
