Theory Of Two Dimensional Materials

DOWNLOAD

Download Theory Of Two Dimensional Materials PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Theory Of Two Dimensional Materials book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page

2d Materials And Van Der Waals Heterostructures

DOWNLOAD
Author : Antonio Di Bartolomeo
language : en
Publisher: MDPI
Release Date : 2020-06-23

2d Materials And Van Der Waals Heterostructures written by Antonio Di Bartolomeo and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-06-23 with Science categories.

The advent of graphene and, more recently, two-dimensional materials has opened new perspectives in electronics, optoelectronics, energy harvesting, and sensing applications. This book, based on a Special Issue published in Nanomaterials – MDPI covers experimental, simulation, and theoretical research on 2D materials and their van der Waals heterojunctions. The emphasis is the physical properties and the applications of 2D materials in state-of-the-art sensors and electronic or optoelectronic devices.

Defects In Two Dimensional Materials

DOWNLOAD
Author : Rafik Addou
language : en
Publisher: Elsevier
Release Date : 2022-02-14

Defects In Two Dimensional Materials written by Rafik Addou and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-02-14 with Technology & Engineering categories.

Defects in Two-Dimensional Materials addresses the fundamental physics and chemistry of defects in 2D materials and their effects on physical, electrical and optical properties. The book explores 2D materials such as graphene, hexagonal boron nitride (h-BN) and transition metal dichalcogenides (TMD). This knowledge will enable scientists and engineers to tune 2D materials properties to meet specific application requirements. The book reviews the techniques to characterize 2D material defects and compares the defects present in the various 2D materials (e.g. graphene, h-BN, TMDs, phosphorene, silicene, etc.). As two-dimensional materials research and development is a fast-growing field that could lead to many industrial applications, the primary objective of this book is to review, discuss and present opportunities in controlling defects in these materials to improve device performance in general or use the defects in a controlled way for novel applications. Presents the theory, physics and chemistry of 2D materials Catalogues defects of 2D materials and their impacts on materials properties and performance Reviews methods to characterize, control and engineer defects in 2D materials

Theory Of Two Dimensional Materials

DOWNLOAD
Author : Yuanxi Wang
language : en
Publisher:
Release Date : 2016

Theory Of Two Dimensional Materials written by Yuanxi Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

In this dissertation, I study the synthesis (and post-synthesis modifications), properties, and structural engineering of two-dimensional materials, using atomistic modeling techniques such as empirical forcefields and density functional theory. The dissertation is divided into four parts. The first part consists of four chapters: in Chapters 1-3 I give an overview on density functional theory and how vibrational properties and optical properties can be calculated within the DFT framework; in Chapter 4 a brief review on two-dimensional materials is given.The second part is devoted to the synthesis and post-synthesis modifications of two-dimensional materials. In Chapter 5 I investigate the intercalation of hexagonal boron nitride and graphite using Bronsted acids such as H3PO4. DFT calculations show that dipolar interactions between acids molecules and the 2D sheets drive the intercalation process.In Chapter 6 I study stripe patterns of W and Mo atoms in triangular monolayers of WxMo1-xS2 alloys. DFT calculations suggest that stripe ordering is kinetically driven, governed by fluctuations in local thermodynamic conditions during growth. In addition, I show that the striped phase alloy is electronically isotropic but vibrationally anisotropic, due to the nearly-identical electronic properties but very different atomic masses of Mo and W.The third part is devoted to computation of vibrational and optical properties of molybdenum and tungsten disulfides. In Chapter 7 we investigate the optical signatures of defect-bound excitons in monolayer WS2. I show that the optical transitions between the highest valence band and mid-gap states introduced by sulfur vacancy defects have finite transition matrix elements. These results agrees with the measured photoluminescence spectra of monolayer WS2 grown by chemical vapor deposition, where spatially resolved photoluminescence at low temperatures revealed two bound excitons. To explain the anomaly in the thermal activation energy of the bound exciton, we propose that excitons are bound to negatively charged defects where two channels of radiative recombinations are allowed.Chapter 8 focuses on intervalley scattering processes in monolayer MoS2, as probed by resonance raman spectroscopy, where the incident laser energy is varied across the A and B excitonic levels. We focus on two Raman peaks that are dispersive, a clear signature of second-order processes involving intervalley scattering. Using group theory and DFT calculations, selection rules are established for intervalley scattering processes mediated by acoustic phonons. In Chapter 9 I investigate Second Harmonic Generation (SHG) in monolayer WS2. Its second order nonlinear susceptibility is nearly three orders of magnitude larger than other common nonlinear crystals. Density functional theory calculations suggest that the origin of the large nonlinear susceptibility lies in resonance enhancement and sharp features in the joint density of states.In the final part, I explore possible methods of manipulating the geometry and grain texture of 2D materials. In Chapter 10 I show that when an atomically thin two-dimensional crystal grows on a substrate of non-zero Gaussian curvature, it can develop finite-length grain boundaries that terminate abruptly within a monocrystalline domain. By properly designing the substrate topography, these grain boundaries can be placed at desired locations and at specified misfit angles, as the thermodynamic ground state of a 2D system bound to a substrate. New properties specific to certain grain boundary geometries, including magnetism and metallicity, can thus be engineered into 2D crystals through topographic design of their substrates.

Raman Spectroscopy Of Two Dimensional Materials

DOWNLOAD
Author : Ping-Heng Tan
language : en
Publisher: Springer
Release Date : 2018-12-30

Raman Spectroscopy Of Two Dimensional Materials written by Ping-Heng Tan and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-12-30 with Technology & Engineering categories.

This book shows the electronic, optical and lattice-vibration properties of the two-dimensional materials which are revealed by the Raman spectroscopy. It consists of eleven chapters covering various Raman spectroscopy techniques (ultralow-frequency, resonant Raman spectroscopy, Raman imaging), different kinds of two-dimensional materials (in-plane isotropy and anisotropy materials, van der Waals heterostructures) and their physical properties (double-resonant theory, surface and interface effect). The topics include the theory origin, experimental phenomenon and advanced techniques in this area. This book is interesting and useful to a wide readership in various fields of condensed matter physics, materials science and engineering.

2d Nanoelectronics

DOWNLOAD
Author : Mircea Dragoman
language : en
Publisher: Springer
Release Date : 2016-12-01

2d Nanoelectronics written by Mircea Dragoman and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-12-01 with Technology & Engineering categories.

This book is dedicated to the new two-dimensional one-atomic-layer-thick materials such as graphene, metallic chalcogenides, silicene and other 2D materials. The book describes their main physical properties and applications in nanoelctronics, photonics, sensing and computing. A large part of the book deals with graphene and its amazing physical properties. Another important part of the book deals with semiconductor monolayers such as MoS2 with impressive applications in photonics, and electronics. Silicene and germanene are the atom-thick counterparts of silicon and germanium with impressive applications in electronics and photonics which are still unexplored. Consideration of two-dimensional electron gas devices conclude the treatment. The physics of 2DEG is explained in detail and the applications in THz and IR region are discussed. Both authors are working currently on these 2D materials developing theory and applications.

2d Materials

DOWNLOAD
Author : Phaedon Avouris
language : en
Publisher: Cambridge University Press
Release Date : 2017-06-29

2d Materials written by Phaedon Avouris and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-06-29 with Science categories.

A comprehensive and accessible introduction to 2D materials, covering basic physics, electronic and optical properties, and potential applications.

Theory Of Two Dimensional Materials

DOWNLOAD
Author : Boyang Zheng
language : en
Publisher:
Release Date : 2022

Theory Of Two Dimensional Materials written by Boyang Zheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.

Relativistic Theory Of The Interaction Of Two Dimensional Materials With Moving Charged Particles

DOWNLOAD
Author : Kamran Akbari
language : en
Publisher:
Release Date : 2019

Relativistic Theory Of The Interaction Of Two Dimensional Materials With Moving Charged Particles written by Kamran Akbari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.

Prompted by the recent surge of interest in integrating atomically thin layers of conducting materials into nanophotonic and nanoplasmonic devices; we propose, in this thesis, a theoretical framework to analyze the interaction of externally moving charged particles with twodimensional (2D) materials. The interactions of 2D materials with externally moving charged particles in the context of electron energy loss spectroscopy (EELS) has become a very popular experimental technique for exploring the plasmon excitations in 2D layered specimens over a broad range of frequencies. On the other hand, the technological need for a stable and tunable source of terahertz (THz) radiation has inspired researchers to explore the electromagnetic radiation from a family of 2D materials, induced by their interaction with fast charged particles. We present a fully relativistic analysis of the energy loss of a charged particle traversing such layers. We distinguish between two contributions to this process: (i) the energy deposited in the layers in the form of electronic excitations (Ohmic losses), which include excitation of 2D plasmon polariton (PP) modes, and (ii) the energy emitted in the far-field region in the form of transition radiation. Owing to the proposed theoretical framework, we study various structures consisting of isotropic and anisotropic conducting and semiconducting sheets with different trajectories of the incident charged particles, including single and multiple parallel layers of graphene under normal incidence of charged particles and single-layer graphene and phosphorene under oblique incidence, in broad ranges of frequency, incident particle's speed, and its angle of incidence relative to the layers. Suitable models for the 2D conductivity of each layer are chosen to represent: (a) excitation of the Dirac PP (DPP) mode in doped graphene in the THz range, (b) interband transitions in graphene in the range from infrared to ultraviolet frequencies, and (c) hyperbolic plasmon modes in doped phosphorene at the THz to mid-infrared frequencies. Among other findings, we observe that, for multilayer graphene, strong asymmetries arise in the Ohmic losses and in the radiation spectra with respect to the direction of motion of the incident particle. These asymmetries are explained by hybridization taking place between DPPs in different layers, which is found to be strongly affected by the interlayer distances and the differences in the doping densities of those layers. In addition, we explore the possibility of exciting the so-called transverse plasmon mode in graphene as well as the directionality of exciting anisotropic plasmons in phosphorene by an obliquely incident charged particle. Our findings may help in the ongoing studies of plasmon excitations in 2D materials via EELS, as well as in exploring the possibility of designing a THz radiation source using an electron beam.

Growth Structure And Properties Of Selected Two Dimensional Materials From Density Functional Theory Investigations

DOWNLOAD
Author : Abdulfattah Ab Abdulslam
language : en
Publisher:
Release Date : 2018

Growth Structure And Properties Of Selected Two Dimensional Materials From Density Functional Theory Investigations written by Abdulfattah Ab Abdulslam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Density functionals categories.

Spintronic 2d Materials

DOWNLOAD
Author : Wenqing Liu
language : en
Publisher: Elsevier
Release Date : 2019-06-15

Spintronic 2d Materials written by Wenqing Liu and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-06-15 with Technology & Engineering categories.

Spintronic 2D Materials: Fundamentals and Applications provides an overview of the fundamental theory of 2D electronic systems that includes a selection of the most intensively investigated 2D materials. The book tells the story of 2D spintronics in a systematic and comprehensive way, providing the growing community of spintronics researchers with a key reference. Part One addresses the fundamental theoretical aspects of 2D materials and spin transport, while Parts Two through Four explore 2D material systems, including graphene, topological insulators, and transition metal dichalcogenides. Each section discusses properties, key issues and recent developments. In addition, the material growth method (from lab to mass production), device fabrication and characterization techniques are included throughout the book. Discusses the fundamentals and applications of spintronics of 2D materials, such as graphene, topological insulators and transition metal dichalcogenides Includes an in-depth look at each materials system, from material growth, device fabrication and characterization techniques Presents the latest solutions on key challenges, such as the spin lifetime of 2D materials, spin-injection efficiency, the potential proximity effects, and much more