Spin-orbit Coupling in Graphene and Transition Metal Dichalcogenides PDF Download

Author: Bowen Yang
Publisher:
ISBN: 9780355754537
Category : Graphene
Languages : en
Pages : 110

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Book Description
The first part briefly introduces graphene and SOC. We present possible ways to increase the SOC in graphene and how to quantify its strength. The second part shows the procedures on how to build a van der Waals heterostructure like graphene/WSe2/h-BN, followed by introductions to Raman and photoluminescence (PL).

Author: Vitalii K Dugaev
Publisher: World Scientific
ISBN: 9813234350
Category : Science
Languages : en
Pages : 331

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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: Alexander V. Kolobov
Publisher: Springer
ISBN: 3319314505
Category : Technology & Engineering
Languages : en
Pages : 545

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Book Description
This book summarizes the current status of theoretical and experimental progress in 2 dimensional graphene-like monolayers and few-layers of transition metal dichalcogenides (TMDCs). Semiconducting monolayer TMDCs, due to the presence of a direct gap, significantly extend the potential of low-dimensional nanomaterials for applications in nanoelectronics and nano-optoelectronics as well as flexible nano-electronics with unprecedented possibilities to control the gap by external stimuli. Strong quantum confinement results in extremely high exciton binding energies which forms an interesting platform for both fundamental studies and device applications. Breaking of spatial inversion symmetry in monolayers results in strong spin-valley coupling potentially leading to their use in valleytronics. Starting with the basic chemistry of transition metals, the reader is introduced to the rich field of transition metal dichalcogenides. After a chapter on three dimensional crystals and a description of top-down and bottom-up fabrication methods of few-layer and single layer structures, the fascinating world of two-dimensional TMDCs structures is presented with their unique atomic, electronic, and magnetic properties. The book covers in detail particular features associated with decreased dimensionality such as stability and phase-transitions in monolayers, the appearance of a direct gap, large binding energy of 2D excitons and trions and their dynamics, Raman scattering associated with decreased dimensionality, extraordinarily strong light-matter interaction, layer-dependent photoluminescence properties, new physics associated with the destruction of the spatial inversion symmetry of the bulk phase, spin-orbit and spin-valley couplings. The book concludes with chapters on engineered heterostructures and device applications such as a monolayer MoS2 transistor. Considering the explosive interest in physics and applications of two-dimensional materials, this book is a valuable source of information for material scientists and engineers working in the field as well as for the graduate students majoring in materials science.

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: Evgeny Y. Tsymbal
Publisher: CRC Press
ISBN: 0429805268
Category : Science
Languages : en
Pages : 646

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Book Description
Spintronics Handbook, Second Edition offers an update on the single most comprehensive survey of the two intertwined fields of spintronics and magnetism, covering the diverse array of materials and structures, including silicon, organic semiconductors, carbon nanotubes, graphene, and engineered nanostructures. It focuses on seminal pioneering work, together with the latest in cutting-edge advances, notably extended discussion of two-dimensional materials beyond graphene, topological insulators, skyrmions, and molecular spintronics. The main sections cover physical phenomena, spin-dependent tunneling, control of spin and magnetism in semiconductors, and spin-based applications. Features: Presents the most comprehensive reference text for the overlapping fields of spintronics (spin transport) and magnetism. Covers the full spectrum of materials and structures, from silicon and organic semiconductors to carbon nanotubes, graphene, and engineered nanostructures. Extends coverage of two-dimensional materials beyond graphene, including molybdenum disulfide and study of their spin relaxation mechanisms Includes new dedicated chapters on cutting-edge topics such as spin-orbit torques, topological insulators, half metals, complex oxide materials and skyrmions. Discusses important emerging areas of spintronics with superconductors, spin-wave spintronics, benchmarking of spintronics devices, and theory and experimental approaches to molecular spintronics. Evgeny Tsymbal's research is focused on computational materials science aiming at the understanding of fundamental properties of advanced ferromagnetic and ferroelectric nanostructures and materials relevant to nanoelectronics and spintronics. He is a George Holmes University Distinguished Professor at the Department of Physics and Astronomy of the University of Nebraska-Lincoln (UNL), Director of the UNL’s Materials Research Science and Engineering Center (MRSEC), and Director of the multi-institutional Center for NanoFerroic Devices (CNFD). Igor Žutić received his Ph.D. in theoretical physics at the University of Minnesota. His work spans a range of topics from high-temperature superconductors and ferromagnetism that can get stronger as the temperature is increased, to prediction of various spin-based devices. He is a recipient of 2006 National Science Foundation CAREER Award, 2005 National Research Council/American Society for Engineering Education Postdoctoral Research Award, and the National Research Council Fellowship (2003-2005). His research is supported by the National Science Foundation, the Office of Naval Research, the Department of Energy, and the Airforce Office of Scientific Research.

Author: Toshiaki Enoki
Publisher: CRC Press
ISBN: 0429662793
Category : Science
Languages : en
Pages : 348

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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: Dongying Wang (Ph. D. in physics)
Publisher:
ISBN:
Category : Graphene
Languages : en
Pages : 0

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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: Narayanasamy Sabari Arul
Publisher: Springer
ISBN: 9811390452
Category : Technology & Engineering
Languages : en
Pages : 361

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Book Description
This book presents advanced synthesis techniques adopted to fabricate two-dimensional (2D) transition metal dichalcogenides (TMDs) materials with its enhanced properties towards their utilization in various applications such as, energy storage devices, photovoltaics, electrocatalysis, electronic devices, photocatalysts, sensing and biomedical applications. It provides detailed coverage on everything from the synthesis and properties to the applications and future prospects of research in 2D TMD 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: Chi Sin Tang
Publisher: John Wiley & Sons
ISBN: 3527838767
Category : Technology & Engineering
Languages : en
Pages : 357

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Book Description
Two-Dimensional Transition-Metal Dichalcogenides Comprehensive resource covering rapid scientific and technological development of polymorphic two-dimensional transition-metal dichalcogenides (2D-TMDs) over a range of disciplines and applications Two-Dimensional Transition-Metal Dichalcogenides: Phase Engineering and Applications in Electronics and Optoelectronics provides a discussion on the history of phase engineering in 2D-TMDs as well as an in-depth treatment on the structural and electronic properties of 2D-TMDs in their respective polymorphic structures. The text addresses different forms of in-situ synthesis, phase transformation, and characterization methods for 2D-TMD materials and provides a comprehensive treatment of both the theoretical and experimental studies that have been conducted on 2D-TMDs in their respective phases. Two-Dimensional Transition-Metal Dichalcogenides includes further information on: Thermoelectric, fundamental spin-orbit structures, Weyl semi-metallic, and superconductive and related ferromagnetic properties that 2D-TMD materials possess Existing and prospective applications of 2D-TMDs in the field of electronics and optoelectronics as well as clean energy, catalysis, and memristors Magnetism and spin structures of polymorphic 2D-TMDs and further considerations on the challenges confronting the utilization of TMD-based systems Recent progress of mechanical exfoliation and the application in the study of 2D materials and other modern opportunities for progress in the field Two-Dimensional Transition-Metal Dichalcogenides provides in-depth review introducing the electronic properties of two-dimensional transition-metal dichalcogenides with updates to the phase engineering transition strategies and a diverse range of arising applications, making it an essential resource for scientists, chemists, physicists, and engineers across a wide range of disciplines.