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Author: Luis E. F. Foa Torres Publisher: Cambridge University Press ISBN: 1107655951 Category : Science Languages : en Pages : 425
Book Description
Beginning with an introduction to carbon-based nanomaterials, their electronic properties, and general concepts in quantum transport, this detailed primer describes the most effective theoretical and computational methods and tools for simulating the electronic structure and transport properties of graphene-based systems. Transport concepts are clearly presented through simple models, enabling comparison with analytical treatments, and multiscale quantum transport methodologies are introduced and developed in a straightforward way, demonstrating a range of methods for tackling the modelling of defects and impurities in more complex graphene-based materials. The authors also discuss the practical applications of this revolutionary nanomaterial, contemporary challenges in theory and simulation, and long-term perspectives. Containing numerous problems for solution, real-life examples of current research, and accompanied online by further exercises, solutions and computational codes, this is the perfect introductory resource for graduate students and researchers in nanoscience and nanotechnology, condensed matter physics, materials science and nanoelectronics.
Author: Jun Yong Khoo Publisher: ISBN: Category : Languages : en Pages : 146
Book Description
The excellent electron properties of graphene, an atomically-thin material with record-high carrier mobility and gate tunability, make it central to modern nanoscience. However, the spin-orbit interaction (SOI) naturally present in graphene is extremely weak and has yet to be observed experimentally. This presents an obstacle for accessing novel phenomena in transport and optics, in particular those related to topological properties. This thesis seeks to address this limitation by artificially introducing SOI in graphene sandwiched between other atomically-thin materials that can produce an interfacial SOI in graphene. In particular, it is demonstrated that a strong SOI, naturally present in the two-dimensional materials such as transition metal dichalcogenides (TMD), can be partially transferred to graphene via the proximity effect. We predict a range of novel phenomena arising in graphene bilayers with layer-asymmetric SOI induced by a proximal TMD layer. These include a gate-tunable SOI, a gate-tunable intrinsic valley-Hall conductivity, as well as a gate-tunable edge conductivity, to name just a few. These findings will facilitate exploring previously inaccessible spin-related phenomena in graphene and other van der Waals heterostructures.
Author: Dongying Wang (Ph. D. in physics) Publisher: ISBN: Category : Graphene Languages : en Pages : 0
Book Description
Van der Waals heterostructure based on stacking two dimensional materials gives rise to new possibilities for engineering multifunctional electronic and spintronic systems. While combining the merits of individual layers, heterostructures provide a platform for studying the interfacial interactions. In particular, significant effort has been made to increase the spin-orbit coupling in graphene by coupling it to transition metal dichalcogenides towards realizing topological electronic ground states. In this thesis, using quantum Hall measurements as a precise probe, we investigate the induced spin-orbit coupling (SOC) in graphene by the proximity to transition metal dichalcogenides (TMDCs) to achieve two main objectives: " Obtain signatures of an enhanced SOC in graphene by proximity to a semiconducting TMDC using quantum Hall measurements." Study the modification that SOC brings into the graphene quantum Hall system, together with other striking interactions, such as Coulomb interaction, exchange coupling and superconducting correlation, which would be building blocks for engineering a graphene-based multifunctional system. To achieve such objectives, many efforts have been devoted to fabricating carefully designed samples, adapting and proposing experimental protocols based on quantum Hall measurements, and in the analysis and modeling of the signals. This thesis is organized as following: Chapter 1 briefly introduces the background of graphene and proximity induced SOC in graphene/TMDCs heterostructure and quantum Hall effect. In Chapter 2, we present the main experimental method of device fabrication and characterization. Here, we will talk about the process of fabricating graphene/TMDCs van der Waals heterostructure with ultra-clean interface, and further introduce some basic idea in electrical transport measurements. In Chapter 3, we demonstrate enhanced SOC in bilayer graphene on WSe2 by quantum Hall measurements. We will show distinct Landau level crossing pattern in this system under a tunable displacement field over a wide range of carrier density. Within the single particle model, we isolate and quantify the Ising SOC and Rashba SOC strength and further bring up the effects of Coulomb interaction. To further study the interplay of Coulomb interaction with induced SOC in the quantum Hall system, we study a monolayer graphene on WSe2 system with in a Hartree- Fock model. In Chapter 4, we show the experimental details and theoretical analysis. The effective dielectric constant as well as the SOC parameters are extracted based on the model, showing consistency with previous work. In addition, a canted anti-ferromagnetic state to ferromagnetic state phase transition at n = 0 LL takes place at low field thanks to the presence of SOC. In Chapter 5, we move one more step forward by bringing exchange coupling into the spin-orbit system, towards realizing helical edge states. The introduction of Cr2Ge2Te6 enable us to directly probe the energy spectrum. We observe clear modifications in graphene's Landau level structure caused by proximity-induced spin- orbit coupling and exchange coupling, which are qualitatively in agreement with the single particle model. In addition, we also show our efforts towards topological superconducting states by introducing superconducting correlation in the graphene/TMDCs system. Premilitary results and proposals of further experiments are shown in Appendix D
Author: Luis E. F. Foa Torres Publisher: Cambridge University Press ISBN: 1107655951 Category : Science Languages : en Pages : 425
Book Description
Beginning with an introduction to carbon-based nanomaterials, their electronic properties, and general concepts in quantum transport, this detailed primer describes the most effective theoretical and computational methods and tools for simulating the electronic structure and transport properties of graphene-based systems. Transport concepts are clearly presented through simple models, enabling comparison with analytical treatments, and multiscale quantum transport methodologies are introduced and developed in a straightforward way, demonstrating a range of methods for tackling the modelling of defects and impurities in more complex graphene-based materials. The authors also discuss the practical applications of this revolutionary nanomaterial, contemporary challenges in theory and simulation, and long-term perspectives. Containing numerous problems for solution, real-life examples of current research, and accompanied online by further exercises, solutions and computational codes, this is the perfect introductory resource for graduate students and researchers in nanoscience and nanotechnology, condensed matter physics, materials science and nanoelectronics.
Author: Toshiaki Enoki Publisher: CRC Press ISBN: 0429662793 Category : Science Languages : en Pages : 348
Book Description
Graphene has been attracting growing attentions in physics, chemistry, and device applications after the discovery of micromechanically cleaved graphene sheet by A. Geim and K. Novoselov, who were awarded the 2010 Nobel Prize in Physics. The electronic structure of graphene, which is described in terms of massless Dirac fermions, brings about unconventional electronic properties, which are not only an important basic issue in condensed matter physics but also a promising target of cutting-edge electronics/spintronics device applications. Meanwhile, from chemistry aspect, graphene is the extreme of condensed polycyclic hydrocarbon molecules extrapolated to infinite size. Here, the concept on aromaticity, which organic chemists utilize, is applicable. Interesting issues appearing between physics and chemistry are pronounced in nanosized graphene (nanographene), as we recognize the importance of the shape of nanographene in understanding its electronic structure. This book comprehensively discusses the fundamental issues related to the electronic, magnetic, and chemical properties of condensed polycyclic hyodrocarbon molecules, nanographene, and graphene.
Author: Junichiro Inoue Publisher: CRC Press ISBN: 9814669571 Category : Science Languages : en Pages : 296
Book Description
The discovery and fabrication of new materials have opened the gate for new research fields in science and technology. The novel method of fabricating graphene, a purely 2D carbon lattice, and the discovery of the phenomenon of giant magnetoresistance (GMR) in magnetic multilayers are not exceptions. The latter has brought about the creation of the
Author: Vitalii K Dugaev Publisher: World Scientific ISBN: 9813234350 Category : Science Languages : en Pages : 331
Book Description
This volume presents lecture notes of the 12th International School of Theoretical Physics held in 2016 in Rzeszów, Poland. The lectures serve as an introduction for young physicists starting their career in condensed matter theoretical physics. The book provides a comprehensive overview of modern ideas and advances in theories and experiments of new materials, quantum nanostructures as well as new mathematical methods.This lecture note is an essential source of reference for physicists and materials scientists. It is also a suitable reading for graduate students.
Author: Dinh Van Tuan Publisher: Springer ISBN: 3319255711 Category : Science Languages : en Pages : 162
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: Luis E. F. Foa Torres
Author: Jun Yong Khoo
Author: Dongying Wang (Ph. D. in physics)
Author: Luis E. F. Foa Torres
Author: Jonas Sichau
Author: Toshiaki Enoki
Author: Petra Högl
Author: Junichiro Inoue
Author: Vitalii K Dugaev
Author: Dinh Van Tuan
Author: Völkl Tobias