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Electronic Structure And Topological Quantum Phase Transitions In Strained Graphene Nanoribbons
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Book Synopsis Electronic Structure and Topological Quantum Phase Transitions in Strained Graphene Nanoribbons by : Fanyao Qu
Download or read book Electronic Structure and Topological Quantum Phase Transitions in Strained Graphene Nanoribbons written by Fanyao Qu and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this chapter, we discuss the new classes of matter, such as the quantum spin Hall (QSH) and quantum anomalous Hall (QAH) states, that have been theoretically predicted and experimentally observed in graphene and beyond graphene systems. We further demonstrate how to manipulate these states using mechanical strain, internal exchange field, and spin-orbit couplings (SOC). Spin-charge transport in strained graphene nanoribbons is also discussed assuming the system in the QAH phase, exploring the prospects of topological devices with dissipationless edge currents. A remarkable zero-field topological quantum phase transition between the time-reversal-symmetry-broken QSH and quantum anomalous Hall states is predicted, which was previously thought to take place only in the presence of external magnetic field. In our proposal, we show as the intrinsic SOC is tuned, how it is possible to two different helicity edge states located in the opposite edges of the graphene nanoribbons exchange their locations. Our results indicate that the strain-induced pseudomagnetic field could be coupled to the spin degrees of freedom through the SOC responsible for the stability of a QSH state. The controllability of this zero-field phase transition with strength and direction of the strain is also explored as additional phase-tuning parameter. Our results present prospect of strain, electric and magnetic manipulation of the QSH, and QAH effect in these novel two-dimensional (2D) materials.
Book Synopsis Recent Advances in Graphene Research by : Pramoda Kumar Nayak
Download or read book Recent Advances in Graphene Research written by Pramoda Kumar Nayak and published by BoD – Books on Demand. This book was released on 2016-10-12 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book ''Recent Advances in Graphene Research'' provides a state-of-the-art report of the knowledge accumulated in graphene research. It contains 12 chapters divided into three sections. Section 1 ''Fundamentals of Graphene'' deals with quantum hall effect in graphene, electronic properties of carbon nanostructures and spectral statistics of graphene nanoflakes. In Section 2 ''Graphene Synthesis,'' the optimized synthesis procedures of graphene and its derivatives are presented. The application of graphene and its nanostructured-based materials for energy storage, conservation and other extensive applications are described in Section 3 ''Application of Graphene and its Nanostructures''. We believe that this book offers broader prospective to the readers in the recent advances in graphene research, starting from fundamental science to application.
Book Synopsis Introduction to Graphene-Based Nanomaterials by : Luis E. F. Foa Torres
Download or read book Introduction to Graphene-Based Nanomaterials written by Luis E. F. Foa Torres and published by Cambridge University Press. This book was released on 2020-01-30 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the electrical and transport properties of graphene and other two-dimensional nanomaterials.
Book Synopsis Strong and Weak Topology Probed by Surface Science by : Christian Pauly
Download or read book Strong and Weak Topology Probed by Surface Science written by Christian Pauly and published by Springer. This book was released on 2016-01-22 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Christian Pauly demonstrates the strong topological properties of the technologically relevant phase change materials Sb2Te3 and Ge2Sb2Te5 by using two powerful techniques for mapping the surface electronic structure: scanning tunneling spectroscopy (STS) and angle-resolved photoemission spectroscopy (ARPES). In the case of a phase change material, this opens up the possibility of switching between an insulating amorphous and a conducting topological phase on nanosecond-time scales. Moreover, the author presents first experimental results of a weak topological insulator, namely on the bismuth-based graphene-like sheet system Bi14Rh3I9, revealing a topologically protected one-dimensional edge channel as its fingerprint. The edge state is as narrow as 0.8 nm, making it extremely attractive to device physics. Those strong and weak topological insulators are a new phase of quantum matter giving rise to robust boundary states which are protected from backscattering and localization.
Book Synopsis Electron Dynamics in Periodically Strained Graphene by : Md. Tareq Mahmud
Download or read book Electron Dynamics in Periodically Strained Graphene written by Md. Tareq Mahmud and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The search for new quantum mechanical phenomena by manipulating the electronic and transport properties of two-dimensional material have become an active research topic in the last decade. Among all the two dimensional materials, graphene got most of the attention due to its fascinating electronic and mechanical properties. Substrates are usually used to support graphene in experiments. The interactions between the substrate and graphene layer result into deformations in the system due to strain. Numerous techniques have already been developed to alter the local density of states and the band structure of graphene. Novel approaches implement engineered substrates to induce specifically targeted strain profiles. Inspired by this technique, we study the evolution of charge distribution with an increasing number of out-of-plane Gaussian deformations. This deformation profile serves as an introduction to model a finite size periodic substrate. We begin with a system of two overlapping deformations and determine the quantitative relations between its geometrical parameters and features in the local density of states. Extending the study to sets of three and four deformations in linear and two-dimensional arrays we observed the emergence of moire0 pattern in charge distributions. These moire0 patterns are more robust for an hexagonal cell composed of seven Gaussian bubbles. A comparison between the induced strain profiles and spatial maps of local density of states at different energies provides evidence of the existence of pseudo-magnetically confined states in the deformed regions. These confined states indicate the possibility of creating quantum dots in graphene via strain modulations. These states exhibit a linear dependence in the energy scaling in contrast to the scaling of pseudo-Landau levels. We further extend these studies to periodic deformation profiles with different periodicity other than the4 graphene lattice, creating a ’superlattice’. This superlattice structure folds the electronic bands and create mini Dirac cones. A pseudo-field configuration which breaks the global inversion symmetry open gaps at the symmetry points of the superlattice. By choosing the deformation parameters carefully one can not only create isolated flat-bands but also manipulate the gaps between them. We study the effects of deformation periodicity in the density of states and the local density of states with different choices of deformation parameters. The nature of the quantum states residing on the flat-bands lead us to identify states localized, from extended states. We find that bands contains this information in terms of a topological invariant known as a Chern number. Modifications on strain profiles may allow to produce phase transitions between trivial and Chern insulators.
Book Synopsis Handbook of Graphene by : Tobias Stauber
Download or read book Handbook of Graphene written by Tobias Stauber and published by John Wiley & Sons. This book was released on 2019-06-12 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second volume in a series of handbooks on graphene research and applications Graphene is a valuable nanomaterial used in technology. This handbook features graphene topics related to Physics, Chemistry, and Biology. The Handbook of Graphene, Volume 2 delivers an overview on the numerous and diverse graphene research directions and innovations. The handbook covers a range of areas including graphene in optoelectronic devices and as a detector of biomolecules.
Book Synopsis Transport Signatures of Quantum Phase Transitions and the Interplay of Geometry and Topology in Nodal Materials by : Benjamin J. Wieder
Download or read book Transport Signatures of Quantum Phase Transitions and the Interplay of Geometry and Topology in Nodal Materials written by Benjamin J. Wieder and published by . This book was released on 2016 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research presented in this thesis is divided into two parts. In the first part, we propose response signatures for quantum phase transitions in superconducting and bilayer graphene systems. In superconducting systems, there is the promise for realizing a Majorana quasiparticle: a fermion that is its own antiparticle and possesses some of the non-Abelian braiding statistics required to form a topological quantum computer. We propose conductance and noise signatures showing the presence of Majorana fermions in topological insulator-superconductor heterostructure Josephson Junctions. We then move on to address the possibility of realizing the physics of quantum point contacts in graphene bilayers. There have been numerous theoretical proposals of quasi-topological domain walls in bilayer graphene. Using bosonization and renormalization group considerations, we propose transport signatures characterizing the pinch-off behavior of the effective point contact formed by the intersection of two domain walls.
Book Synopsis Structure- and Adatom-Enriched Essential Properties of Graphene Nanoribbons by : Shih-Yang Lin
Download or read book Structure- and Adatom-Enriched Essential Properties of Graphene Nanoribbons written by Shih-Yang Lin and published by CRC Press. This book was released on 2018-11-19 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structure- and Adatom-Enriched Essential Properties of Graphene Nanoribbons offers a systematic review of the feature-rich essential properties in emergent graphene nanoribbons, covering mainstream theoretical and experimental research. It includes a wide range of 1D systems; namely, armchair and zigzag graphene nanoribbons with and without hydrogen terminations, curved and zipped graphene nanoribbons, folded graphene nanoribbons, carbon nanoscrolls, bilayer graphene nanoribbons, edge-decorated graphene nanoribbons, and alkali-, halogen-, Al-, Ti, and Bi-absorbed graphene nanoribbons. Both multiorbital chemical bondings and spin arrangements, which are responsible for the diverse phenomena, are explored in detail. First-principles calculations are developed to thoroughly describe the physical, chemical, and material phenomena and concise images explain the fundamental properties. This book examines in detail the application and theory of graphene nanoribbons, offering a new perspective on up-to-date mainstream theoretical and experimental research.
Book Synopsis Graphene Quantum Dots by : Alev Devrim Güçlü
Download or read book Graphene Quantum Dots written by Alev Devrim Güçlü and published by Springer. This book was released on 2014-09-11 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reflects the current status of theoretical and experimental research of graphene based nanostructures, in particular quantum dots, at a level accessible to young researchers, graduate students, experimentalists and theorists. It presents the current state of research of graphene quantum dots, a single or few monolayer thick islands of graphene. It introduces the reader to the electronic and optical properties of graphite, intercalated graphite and graphene, including Dirac fermions, Berry's phase associated with sublattices and valley degeneracy, covers single particle properties of graphene quantum dots, electron-electron interaction, magnetic properties and optical properties of gated graphene nanostructures. The electronic, optical and magnetic properties of the graphene quantum dots as a function of size, shape, type of edge and carrier density are considered. Special attention is paid to the understanding of edges and the emergence of edge states for zigzag edges. Atomistic tight binding and effective mass approaches to single particle calculations are performed. Furthermore, the theoretical and numerical treatment of electron-electron interactions at the mean-field, HF, DFT and configuration-interaction level is described in detail.
Book Synopsis Classical And Quantum Dynamics In Condensed Phase Simulations: Proceedings Of The International School Of Physics by : Bruce J Berne
Download or read book Classical And Quantum Dynamics In Condensed Phase Simulations: Proceedings Of The International School Of Physics written by Bruce J Berne and published by World Scientific. This book was released on 1998-06-17 with total page 881 pages. Available in PDF, EPUB and Kindle. Book excerpt: The school held at Villa Marigola, Lerici, Italy, in July 1997 was very much an educational experiment aimed not just at teaching a new generation of students the latest developments in computer simulation methods and theory, but also at bringing together researchers from the condensed matter computer simulation community, the biophysical chemistry community and the quantum dynamics community to confront the shared problem: the development of methods to treat the dynamics of quantum condensed phase systems.This volume collects the lectures delivered there. Due to the focus of the school, the contributions divide along natural lines into two broad groups: (1) the most sophisticated forms of the art of computer simulation, including biased phase space sampling schemes, methods which address the multiplicity of time scales in condensed phase problems, and static equilibrium methods for treating quantum systems; (2) the contributions on quantum dynamics, including methods for mixing quantum and classical dynamics in condensed phase simulations and methods capable of treating all degrees of freedom quantum-mechanically.
Book Synopsis Advanced Nanomaterials for Detection of CBRN by : Janez Bonča
Download or read book Advanced Nanomaterials for Detection of CBRN written by Janez Bonča and published by Springer Nature. This book was released on 2020-09-07 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to advanced materials and perspective sensors, which is one of the most important problems in nanotechnology and security. This book is useful for researchers, scientist and graduate students in the fields of solid state physics, nanotechnology and security.
Book Synopsis The Physics of Graphene by : Mikhail I. Katsnelson
Download or read book The Physics of Graphene written by Mikhail I. Katsnelson and published by Cambridge University Press. This book was released on 2020-03-19 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leading graphene research theorist Mikhail I. Katsnelson systematically presents the basic concepts of graphene physics in this fully revised second edition. The author illustrates and explains basic concepts such as Berry phase, scaling, Zitterbewegung, Kubo, Landauer and Mori formalisms in quantum kinetics, chirality, plasmons, commensurate-incommensurate transitions and many others. Open issues and unsolved problems introduce the reader to the latest developments in the field. New achievements and topics presented include the basic concepts of Van der Waals heterostructures, many-body physics of graphene, electronic optics of Dirac electrons, hydrodynamics of electron liquid and the mechanical properties of one atom-thick membranes. Building on an undergraduate-level knowledge of quantum and statistical physics and solid-state theory, this is an important graduate textbook for students in nanoscience, nanotechnology and condensed matter. For physicists and material scientists working in related areas, this is an excellent introduction to the fast-growing field of graphene science.
Book Synopsis Atomic and Molecular Manipulation by :
Download or read book Atomic and Molecular Manipulation written by and published by Elsevier. This book was released on 2011-07-13 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Work with individual atoms and molecules aims to demonstrate that miniaturized electronic, optical, magnetic, and mechanical devices can operate ultimately even at the level of a single atom or molecule. As such, atomic and molecular manipulation has played an emblematic role in the development of the field of nanoscience. New methods based on the use of the scanning tunnelling microscope (STM) have been developed to characterize and manipulate all the degrees of freedom of individual atoms and molecules with an unprecedented precision. In the meantime, new concepts have emerged to design molecules and substrates having specific optical, mechanical and electronic functions, thus opening the way to the fabrication of real nano-machines. Manipulation of individual atoms and molecules has also opened up completely new areas of research and knowledge, raising fundamental questions of "Optics at the atomic scale", "Mechanics at the atomic scale", Electronics at the atomic scale", "Quantum physics at the atomic scale", and "Chemistry at the atomic scale". This book aims to illustrate the main aspects of this ongoing scientific adventure and to anticipate the major challenges for the future in "Atomic and molecular manipulation" from fundamental knowledge to the fabrication of atomic-scale devices. Provides a broad overview of the field to aid those new and entering into this research area Presents a review of the historical development and evolution of the field Offers a clear personalized view of current scanning probe microscopy research from world experts
Download or read book Silicene written by Michelle Spencer and published by Springer. This book was released on 2016-02-19 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the current state-of-the art of single layer silicene up to thicker silicon nanosheets, and their structure, properties and potential applications. Silicene is a newly discovered material that is one atomic layer think. It is a two-dimensional (2D) nanomaterial that is classified as a nanosheet, which has large lateral dimensions up to micrometres, but thicknesses of only nanometres or less. Silicon nanosheets are currently a very ‘hot’ area of research. The unique properties and morphology of such materials make them ideal for a variety of applications, including electronic devices, batteries and sensors. 2D nanosheets of silicon can be considered as analogues of graphene. As silicon is already the major component of electronic devices, the significance of nanosheets composed of silicon is that they can be more easily integrated into existing electronic devices. Furthermore, if 2D nanostructured Si can be implemented into such devices, then their size could be reduced into the nano-regime, providing unique properties different from bulk Si that is currently employed. The book is written for researchers and graduate students.
Book Synopsis 2D Monoelemental Materials (Xenes) and Related Technologies by : Zongyu Huang
Download or read book 2D Monoelemental Materials (Xenes) and Related Technologies written by Zongyu Huang and published by CRC Press. This book was released on 2022-04-19 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monoelemental 2D materials called Xenes have a graphene-like structure, intra-layer covalent bond, and weak van der Waals forces between layers. Materials composed of different groups of elements have different structures and rich properties, making Xenes materials a potential candidate for the next generation of 2D materials. 2D Monoelemental Materials (Xenes) and Related Technologies: Beyond Graphene describes the structure, properties, and applications of Xenes by classification and section. The first section covers the structure and classification of single-element 2D materials, according to the different main groups of monoelemental materials of different components and includes the properties and applications with detailed description. The second section discusses the structure, properties, and applications of advanced 2D Xenes materials, which are composed of heterogeneous structures, produced by defects, and regulated by the field. Features include: Systematically detailed single element materials according to the main groups of the constituent elements Classification of the most effective and widely studied 2D Xenes materials Expounding upon changes in properties and improvements in applications by different regulation mechanisms Discussion of the significance of 2D single-element materials where structural characteristics are closely combined with different preparation methods and the relevant theoretical properties complement each other with practical applications Aimed at researchers and advanced students in materials science and engineering, this book offers a broad view of current knowledge in the emerging and promising field of 2D monoelemental materials.
Book Synopsis Elementary Electronic Structure by : Walter Ashley Harrison
Download or read book Elementary Electronic Structure written by Walter Ashley Harrison and published by World Scientific. This book was released on 2004 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a revised edition of the 1999 text on the electronic structure and properties of solids, similar in spirit to the well-known 1980 text Electronic Structure and the Properties of Solids. The revisions include an added chapter on glasses, and rewritten sections on spin-orbit coupling, magnetic alloys, and actinides. The text covers covalent semiconductors, ionic insulators, simple metals, and transition-metal and f-shell-metal systems. It focuses on the most important aspects of each system, making what approximations are necessary in order to proceed analytically and obtain formulae for the properties. Such back-of-the-envelope formulae, which display the dependence of any property on the parameters of the system, are characteristic of Harrison's approach to electronic structure, as is his simple presentation and his provision of all the needed parameters.In spite of the diversity of systems and materials, the approach is systematic and coherent, combining the tight-binding (or atomic) picture with the pseudopotential (or free-electron) picture. This provides parameters ? the empty-core radii as well as the covalent energies ? and conceptual bases for estimating the various properties of all these systems. Extensive tables of parameters and properties are included.The book has been written as a text, with problems at the end of each chapter, and others can readily be generated by asking for estimates of different properties, or different materials, than those treated in the text. In fact, the ease of generating interesting problems reflects the extraordinary utility and simplicity of the methods introduced. Developments since the 1980 publication have made the theory simpler and much more accurate, besides allowing much wider application.
Book Synopsis A Short Course on Topological Insulators by : János K. Asbóth
Download or read book A Short Course on Topological Insulators written by János K. Asbóth and published by Springer. This book was released on 2016-02-22 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This course-based primer provides newcomers to the field with a concise introduction to some of the core topics in the emerging field of topological insulators. The aim is to provide a basic understanding of edge states, bulk topological invariants, and of the bulk--boundary correspondence with as simple mathematical tools as possible. The present approach uses noninteracting lattice models of topological insulators, building gradually on these to arrive from the simplest one-dimensional case (the Su-Schrieffer-Heeger model for polyacetylene) to two-dimensional time-reversal invariant topological insulators (the Bernevig-Hughes-Zhang model for HgTe). In each case the discussion of simple toy models is followed by the formulation of the general arguments regarding topological insulators. The only prerequisite for the reader is a working knowledge in quantum mechanics, the relevant solid state physics background is provided as part of this self-contained text, which is complemented by end-of-chapter problems.
