First-principles Study of Electronic Properties of One Dimensional Nanostructures PDF Download
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Author: Junwen Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 130
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Book Description
Author: Junwen Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 130
Get Book Here
Book Description
Author: Tianyou Zhai
Publisher: John Wiley & Sons
ISBN: 1118310365
Category : Technology & Engineering
Languages : en
Pages : 857
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Book Description
Reviews the latest research breakthroughs and applications Since the discovery of carbon nanotubes in 1991, one-dimensional nanostructures have been at the forefront of nanotechnology research, promising to provide the building blocks for a new generation of nanoscale electronic and optoelectronic devices. With contributions from 68 leading international experts, this book reviews both the underlying principles as well as the latest discoveries and applications in the field, presenting the state of the technology. Readers will find expert coverage of all major classes of one-dimensional nanostructures, including carbon nanotubes, semiconductor nanowires, organic molecule nanostructures, polymer nanofibers, peptide nanostructures, and supramolecular nanostructures. Moreover, the book offers unique insights into the future of one-dimensional nanostructures, with expert forecasts of new research breakthroughs and applications. One-Dimensional Nanostructures collects and analyzes a wealth of key research findings and applications, with detailed coverage of: Synthesis Properties Energy applications Photonics and optoelectronics applications Sensing, plasmonics, electronics, and biosciences applications Practical case studies demonstrate how the latest applications work. Tables throughout the book summarize key information, and diagrams enable readers to grasp complex concepts and designs. References at the end of each chapter serve as a gateway to the literature in the field. With its clear explanations of the underlying principles of one-dimensional nanostructures, this book is ideal for students, researchers, and academics in chemistry, physics, materials science, and engineering. Moreover, One-Dimensional Nanostructures will help readers advance their own investigations in order to develop the next generation of applications.
Author: Zhiming M Wang
Publisher: Springer Science & Business Media
ISBN: 0387741321
Category : Technology & Engineering
Languages : en
Pages : 335
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Book Description
One-dimensional (1D) nanostructures, including nanowires, nanotubes and quantum wires, have been regarded as the most promising building blocks for nanoscale electronic and optoelectronic devices. This book presents exciting, state-of-the-art developments in synthesis and properties of 1D nanostructures with many kinds of morphologies and compositions as well as their considerable impact on spintronics, information storage, and the design of field-effect transistors.
Author: Kevin Timothy Chan
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Book Description
This work presents first-principles theoretical studies on two topics of condensed matter physics. The first topic is the adsorption of metal adatoms on graphene. Graphene, a two-dimensional material made of carbon atoms arranged in a honeycomb lattice, has many outstanding properties that can be enhanced or tailored by adsorbing adatoms on its surface. The second topic involves the coupling of spins or electrons to phonons in a solid. The interaction between different degrees of freedom of a material complicates the study of its properties but also leads to fascinating phenomena, such as superconductivity, and potential device applications. This dissertation is organized into six chapters: · In Chapter One, we give an overview of this work and review the first-principles theory and methods used in our studies. · Chapter Two focuses on structural, energetic, and electronic properties for a variety of adatom species adsorbed on the graphene surface. We classify different species as having mostly ionic or covalent character of bonding to graphene. For ionically bonded adatoms, charge transfer between the adatom and graphene is signficant. We find general trends relating the surface dipole moment, work function, and atomic ionization potential of the adatom species. · In Chapter Three, we study the electronic structure of adatoms on graphene when a gate voltage is applied to control the number of electrons in the system. Lithium on graphene, a prototype system, and cobalt on graphene, an experimentally relevant case, are studied. We find that localized states on the adatom can be charged or discharged by the application of gate voltage, and we study the changes in potential and charge density of the system as electrons are added or removed. · In Chapter Four, we extend the work in Chapter Three to consider the possibility of transforming the electronic structure of one species of adatom on graphene into that of another by applying a gate voltage. We find that within our model, such transformations are possible for certain adatom species. · In Chapter Five, the zone-center phonons for the frustrated antiferromagnetic compound ZnCr2O4 are calculated. We find that the transition from nonmagnetic to antiferromagnetic ordering causes a splitting of certain degnerate phonon frequencies, in agreement with experimental results. · In Chapter Six, the pressure dependence of electron-phonon coupling and the superconducting transition temperature (Tc) in elemental arsenic is studied. We find that an experimentally observed peak in Tc as a function of pressure is related to a structural transition and can be explained mainly by changes in electronic structure and phonon frequencies with pressure.
Author: Engg Kamakhya Prasad Ghatak
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110609355
Category : Science
Languages : en
Pages : 432
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Book Description
The work studies under different physical conditions the carrier contribution to elastic constants in heavily doped optoelectronic materials. In the presence of intense photon field the authors apply the Heisenberg Uncertainty Principle to formulate electron statistics. Many open research problems are discussed and numerous potential applications as quantum sensors and quantum cascade lasers are presented.
Author: Kikuji Hirose
Publisher: World Scientific
ISBN: 1783260432
Category : Science
Languages : en
Pages : 265
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Book Description
With cutting-edge materials and minute electronic devices being produced by the latest nanoscale fabrication technology, it is essential for scientists and engineers to rely on first-principles (ab initio) calculation methods to fully understand the electronic configurations and transport properties of nanostructures. It is now imperative to introduce practical and tractable calculation methods that accurately describe the physics in nanostructures suspended between electrodes.This timely volume addresses novel methods for calculating electronic transport properties using real-space formalisms free from geometrical restrictions. The book comprises two parts: The first details the basic formalism of the real-space finite-difference method and its applications. This provides the theoretical foundation for the second part of the book, which presents the methods for calculating the properties of electronic transport through nanostructures sandwiched by semi-infinite electrodes./a
Author: Abbass A. Hashim
Publisher: BoD – Books on Demand
ISBN: 9533073276
Category : Science
Languages : en
Pages : 568
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Book Description
Understanding and building up the foundation of nanowire concept is a high requirement and a bridge to new technologies. Any attempt in such direction is considered as one step forward in the challenge of advanced nanotechnology. In the last few years, InTech scientific publisher has been taking the initiative of helping worldwide scientists to share and improve the methods and the nanowire technology. This book is one of InTechs attempts to contribute to the promotion of this technology.
Author: Jack Deslippe
Publisher:
ISBN:
Category :
Languages : en
Pages : 143
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Book Description
Recent advances in computational physics and chemistry have lead to greater understanding and predictability of the electronic and optical properties of materials. This understanding can be used to impact directly the development of future devices (whose properties depend on the underlying materials) such as light-emitting diodes (LEDs) and photovoltaics. In particular, density functional theory (DFT) has become the standard method for predicting the ground-state properties of solid-state systems, such-as total energies, atomic configurations and phonon frequencies. In the same period, the so called many-body perturbation theory techniques based on the dynamics of the single-particle and two-particle Green's function have become one of the standard methods for predicting the excited state properties associated with the addition of an electron, hole or electron-hole pair into a material. The GW and Bethe-Salpeter equation (GW-BSE) technique is a particularly robust methodology for computing the quasiparticle and excitonic properties of materials. The challenge over the last several years has been to apply these methods to increasingly complex systems. Nano-materials are materials that are very small (on the order of a nanometer) in at least one dimension (e.g. molecules, tubes/rods and sheets). These materials are of great interest for researchers because they exhibit new and interesting physical and electronic properties compared to those of conventional bulk crystals. These physical properties can often be tuned by controlling the geometry of the materials (for example the chiral angle of a nanotube). Various DFT computer packages have been optimized to compute the ground-state properties of large systems and nano-materials. However, the application of the GW-BSE methodology to large systems and large nano-materials is often thought to be too computationally demanding. In this work, we will discuss research towards understanding the electronic and optical properties of nano-materials using (and extending) first-principles computational techniques, namely the GW-BSE technique for applications to large systems and nano-materials in particular. While, the GW-BSE approach has, in the past, been prohibitively expensive on systems with more than 50 atoms, in Chapter 2, we show that through a combination methodological and algorithmic improvements, the standard GW-BSE approach can be applied to systems of 500-1000 atoms or 100 AU x 100 AU x 100 AU unit cells. We show that nearly linear parallel scaling of the GW-BSE methodology can be obtained up to tens of thousands (and beyond) of CPUs on current and future high performance supercomputers. In Chapter 3, we will discuss improving the DFT starting point of the GW-BSE approach through the use of COHSEX exchange-correlations functionals to create a nearly diagonal self-energy matrix. We show applications of this new methodology to molecular systems. In Chapter 4, we discuss the application of the GW-BSE methodology to semiconducting single-walled carbon nanotubes (SWCNTs) and the discovery of novel many-body physics in 1D semiconductors. In Chapter 5, we discuss the application of the GW-BSE methodology to metallic SWCNTs and graphene and the discovery of unexpectedly strong excitonic effects in low-dimensional metals and semi-metals.
Author:
Publisher: ScholarlyEditions
ISBN: 1464920583
Category : Technology & Engineering
Languages : en
Pages : 8760
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Book Description
Advances in Nanotechnology Research and Application: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Nanotechnology. The editors have built Advances in Nanotechnology Research and Application: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Nanotechnology in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Advances in Nanotechnology Research and Application: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Author: Bogdan Stefan Vasile
Publisher: MDPI
ISBN: 3039289675
Category : Technology & Engineering
Languages : en
Pages : 294
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Book Description
The book is focused on nanostructured materials, which have been well-studied in various fields from life to materials sciences. Nanostructured science has the potential to help make revolutionary discoveries based on modifying the properties of these materials compared with micro-structured materials. Nanostructured materials are the key to discovering new products based on new technologies. This book is focused on presenting new state-of-the-art methods for the synthesis and processing of nanostructured materials. These materials can be used in both in life and materials science with applications from biomedical devices, drug delivery systems, medical imaging with multiferoic materials, high-energy batteries, capacitors, superconductors, and aerospace components.
