Charge and Energy Transport in Single Quantum Dot/organic Hybrid Nanostructures PDF Download

Author: Kevin T. Early
Publisher:
ISBN:
Category : Cadmium selenide
Languages : en
Pages : 92

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Author: Joseph Albert Sulpizio
Publisher: Stanford University
ISBN:
Category :
Languages : en
Pages : 171

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Book Description
One-dimensional (1D) electronic nanostructures comprise a class of systems that boast tremendous promise for both technological innovation as well as fundamental scientific discovery. To fully harness their potential, it is crucial to understand transport through 1D systems at the most fundamental, quantum level. In this thesis, we describe our investigations down three avenues of quantum transport in 1D: (1) ballistic transport in quantum wires, (2) quantum capacitance measurements of nanostructures, and (3) tunneling measurements in carbon nanotubes. First, we discuss measurements and modeling of hole transport in ballistic quantum wires fabricated by GaAs/AlGaAs cleaved-edge overgrowth, where we find strong g-factor anisotropy, which we associate with spin-orbit coupling, and evidence for the importance of charge interactions, indicated by the observation of "0.7" structure. Additionally, we present the first experimental observation of a predicted spin-orbit gap in the 1D density of states, where counter-propagating spins constituting a spin current are accompanied by a clear signal in the conductance. Next, we present the development of a highly sensitive integrated capacitance bridge for quantum capacitance measurements to be used as a novel probe of 1D systems. We demonstrate the utility of our bridge by measuring the capacitance of top-gated graphene devices, where we cleanly resolve the density of states, and also present preliminary measurements of carbon nanotube devices, where we ultimately aim to extract their mobility. Finally, we discuss a set of transport measurements in carbon nanotubes designed to probe interactions between fermions in 1D in which top gates are used to introduce tunable tunnel barriers.

Author:
Publisher:
ISBN:
Category : Charge transfer
Languages : en
Pages : 126

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Author: Dmitry Ryndyk
Publisher: Springer
ISBN: 3319240889
Category : Science
Languages : en
Pages : 251

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This book is an introduction to a rapidly developing field of modern theoretical physics – the theory of quantum transport at nanoscale. The theoretical methods considered in the book are in the basis of our understanding of charge, spin and heat transport in nanostructures and nanostructured materials and are widely used in nanoelectronics, molecular electronics, spin-dependent electronics (spintronics) and bio-electronics. The book is based on lectures for graduate and post-graduate students at the University of Regensburg and the Technische Universität Dresden (TU Dresden). The first part is devoted to the basic concepts of quantum transport: Landauer-Büttiker method and matrix Green function formalism for coherent transport, Tunneling (Transfer) Hamiltonian and master equation methods for tunneling, Coulomb blockade, vibrons and polarons. The results in this part are obtained as possible without sophisticated techniques, such as nonequilibrium Green functions, which are considered in detail in the second part. A general introduction into the nonequilibrium Green function theory is given. The approach based on the equation-of-motion technique, as well as more sophisticated one based on the Dyson-Keldysh diagrammatic technique are presented. The main attention is paid to the theoretical methods able to describe the nonequilibrium (at finite voltage) electron transport through interacting nanosystems, specifically the correlation effects due to electron-electron and electron-vibron interactions.

Author: Arvind Kumar
Publisher: John Wiley & Sons
ISBN: 3527837655
Category : Technology & Engineering
Languages : en
Pages : 373

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Book Description
1D Semiconducting Hybrid Nanostructures In-depth discussion on the physics, chemistry, and engineering beneath the construction of 1D semiconducting hybrid materials 1D Semiconducting Hybrid Nanostructures: Synthesis and Applications in Gas Sensing and Optoelectronics provides breakthrough research developments and trends in a variety of 1D hybrid nanostructures for chemi-resistive gas sensors and optoelectronics applications, including recent investigations and developments regarding the innovative designing approaches, fabrications, and methods used to characterize these hybrid nanostructures. The text also includes the surface and interface properties of 1D hybrid semiconducting nanostructured materials, as well as their optimization for applications in gas sensing and optoelectronics. This book further addresses the different issues of sensitivity, selectivity, and operating temperature of gas sensors based on hybrid 1D nanostructures. Moreover, it covers the novel and additional functional optoelectronic properties that originate at the interface of 1D semiconducting nanostructures combined with other low dimensional materials. Some of the specific sample topics covered in this book include: Gas sensing and optoelectronic applications of one-dimensional semiconducting hybrid nanostructures, plus synthesis and gas sensing application of 1D semiconducting hybrid nanostructures Room temperature gas sensing properties of metal oxide nanowire/graphene hybrid structures and highly sensitive room temperature gas sensors based on organic-inorganic nanofibers Synthesis and applications of 1D hybrid tin oxide nanostructures and recent advances in semiconducting nanowires-based hybrid structures for solar application Types of semiconducting hybrid nanostructures for optoelectronic devices and hybrid 1D semiconducting ZnO/GaN nanostructures Thanks to its comprehensive coverage of the subject from highly qualified authors who have significant experience in the field, 1D Semiconducting Hybrid Nanostructures is a must-have reference for senior undergraduate and graduate students, professionals, researchers, in the field of semiconductor physics, materials science, surface science, and chemical engineering.

Author: Konstantin Kikoin
Publisher: Springer Science & Business Media
ISBN: 3211997245
Category : Technology & Engineering
Languages : en
Pages : 359

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Book Description
Group theoretical concepts elucidate fundamental physical phenomena, including excitation spectra of quantum systems and complex geometrical structures such as molecules and crystals. These concepts are extensively covered in numerous textbooks. The aim of the present monograph is to illuminate more subtle aspects featuring group theory for quantum mechanics, that is, the concept of dynamical symmetry. Dynamical symmetry groups complement the conventional groups: their elements induce transitions between states belonging to different representations of the symmetry group of the Hamiltonian. Dynamical symmetry appears as a hidden symmetry in the hydrogen atom and quantum rotator problem, but its main role is manifested in nano and meso systems. Such systems include atomic clusters, large molecules, quantum dots attached to metallic electrodes, etc. They are expected to be the building blocks of future quantum electronic devices and information transmitting algorithms. Elucidation of the electronic properties of such systems is greatly facilitated by applying concepts of dynamical group theory.

Author: Gerasimos Konstantatos
Publisher: Cambridge University Press
ISBN: 0521198267
Category : Science
Languages : en
Pages : 329

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Book Description
Captures the most up-to-date research in the field, written in an accessible style by the world's leading experts.

Author: Sven Dorsch
Publisher:
ISBN: 9789180391979
Category :
Languages : en
Pages :

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Book Description
Quantum dots embedded in an electronic circuit allow precise control over the charge transport behaviour of the system: Charge carriers can be individually trapped or precisely shuffled between a series of quantum dots in a strictly sequential manner. This introduces ideal conditions to study fundamental quantum physics and such devices are in the focus of extensive efforts to develop quantum information related applications. This thesis contributes to the development of model systems enabling control of, and abiding by quantum mechanical effects. The aim of the model systems is to search and use advantages compared to devices governed purely by the laws of classical physics. In this thesis, transport phenomena in n- and p-type III-V semiconductor nanowire quantum dot systems are explored. First, the concepts necessary to build an understanding of charge transport across quantum dot systems, namely quantum confinement in nanostructures and Coulomb blockade, are introduced. Next, the principles of transport across single and double quantum dot devices are discussed and various experimental device designs are presented. The experimental work falls into two separate research directions and the thesis includes three published papers, which are put into context and supplemented with additional experimental results. Paper I characterizes the properties of p-type GaSb nanowires to assess the material's applicability for the realization of spin-orbit qubits as fundamental building blocks of solid state quantum computers. Experimentally, g-factors and the spin-orbit energy are determined and fabricational challenges for the realization of serial double quantum dot devices are discussed and overcome. Papers II and III study thermally driven currents in InAs nanowire double quantum dots, where heat is essentially converted to electrical power. Such nanoscale energy harvesters operate in a regime where fluctuations are highly relevant and give insights into fundamental nanothermodynamic concepts. Thermally induced currents in double quantum dot devices are the result of three-terminal phonon-assisted transport or the two-terminal thermoelectric effect. Paper II studies the interplay of the two effects, the relevance of the interdot coupling and the impact of excited states. Paper III develops a versatile device architecture which combines bottom-gating and heating and enables the localized application of heat along the nanowire axis. Such devices provide ideal, controlled conditions for future studies of fundamental nanothermodynamics.

Author: Quan Li
Publisher: John Wiley & Sons
ISBN: 3527807373
Category : Technology & Engineering
Languages : en
Pages : 838

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Book Description
The first book to explore the potential of tunable functionalities in organic and hybrid nanostructured materials in a unified manner. The highly experienced editor and a team of leading experts review the promising and enabling aspects of this exciting materials class, covering the design, synthesis and/or fabrication, properties and applications. The broad topical scope includes organic polymers, liquid crystals, gels, stimuli-responsive surfaces, hybrid membranes, metallic, semiconducting and carbon nanomaterials, thermoelectric materials, metal-organic frameworks, luminescent and photochromic materials, and chiral and self-healing materials. For materials scientists, nanotechnologists as well as organic, inorganic, solid state and polymer chemists.

Author: Beata Luszczynska
Publisher: John Wiley & Sons
ISBN: 3527814957
Category : Technology & Engineering
Languages : en
Pages : 688

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Book Description
Provides first-hand insights into advanced fabrication techniques for solution processable organic electronics materials and devices The field of printable organic electronics has emerged as a technology which plays a major role in materials science research and development. Printable organic electronics soon compete with, and for specific applications can even outpace, conventional semiconductor devices in terms of performance, cost, and versatility. Printing techniques allow for large-scale fabrication of organic electronic components and functional devices for use as wearable electronics, health-care sensors, Internet of Things, monitoring of environment pollution and many others, yet-to-be-conceived applications. The first part of Solution-Processable Components for Organic Electronic Devices covers the synthesis of: soluble conjugated polymers; solution-processable nanoparticles of inorganic semiconductors; high-k nanoparticles by means of controlled radical polymerization; advanced blending techniques yielding novel materials with extraordinary properties. The book also discusses photogeneration of charge carriers in nanostructured bulk heterojunctions and charge carrier transport in multicomponent materials such as composites and nanocomposites as well as photovoltaic devices modelling. The second part of the book is devoted to organic electronic devices, such as field effect transistors, light emitting diodes, photovoltaics, photodiodes and electronic memory devices which can be produced by solution-based methods, including printing and roll-to-roll manufacturing. The book provides in-depth knowledge for experienced researchers and for those entering the field. It comprises 12 chapters focused on: ? novel organic electronics components synthesis and solution-based processing techniques ? advanced analysis of mechanisms governing charge carrier generation and transport in organic semiconductors and devices ? fabrication techniques and characterization methods of organic electronic devices Providing coverage of the state of the art of organic electronics, Solution-Processable Components for Organic Electronic Devices is an excellent book for materials scientists, applied physicists, engineering scientists, and those working in the electronics industry.