Download or read book Ferromagnetically Contacted Carbon Nanotube Quantum Dots written by Mark Dennis Elkin and published by . This book was released on 2012 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents research into spin-transport in Carbon nanotube quantum dots. Sputtered Permalloy electrodes designed with shape anisotropy were used to contact Carbon nanotubes grown by chemicalvapour deposition in lateral spin-valve structures. The magnetoresistance of these spin-valves were measured at low-temperatures and as a function of the charge state of the quantum dots. Two conductance regimes were measured in a Carbon nanotube spinvalve with Permalloy nucleation pads. At high bias outside of the coulomb blockade regime a ~ 10% magnetoresistance was measured that is analogous to giant-magnetoresistance, in that it is due to spindependent scattering at the ferromagnet-Carbon nanotube interfaces. At lower bias the device enters the coulomb blockade regime and the magnetoresistance observed develops a different structure, over a larger field range, together with the development of an offset in conductance between saturations. The maximum value of this MR was MR ~ 245% and it was attributed to changes in the induced charge on the quantum dot. By modifying the design of the Permalloy electrodes, a single domain state at the point of contact of the Carbon nanotube was achieved. A well defined anti-parallel state of the Permalloy electrodes, with associated changes in the conduction of the devices was observed, yet the conductance offset remained, with a maximum MR of ~ 60%. The positions of the coulomb peaks were measured during magnetic reversal of the electrodes, showing the change in induced charge on the quantum dot, with a maximum MR ~ 350%. Predictions of device transport based on the magneto-coulomb effect and spin-dependent interfacial phase shifts were compared to experimental results and found to not fit the observed behaviour. This led to the conclusion that changes in the charge state of the quantum dots must be due to a fixed spin-quantisation axis intrinsic to the Carbon nanotube.

Download or read book Investigation of Carbon Nanotube Quantum Dots Connected to Ferromagnetic Leads written by and published by . This book was released on 2015 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Kondo Effect in Single Wall Carbon Nanotubes with Ferromagnetic Contacts written by Markus Gaaß and published by . This book was released on 2012 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Non equilibrium Many body States in Carbon Nanotube Quantum Dots written by Tokuro Hata and published by Springer. This book was released on 2019-05-14 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the first experiment revealing several unexplored non-equilibrium properties of quantum many-body states, and addresses the interplay between the Kondo effect and superconductivity by probing shot noise. In addition, it describes in detail nano-fabrication techniques for carbon nanotube quantum dots, and a measurement protocol and principle that probes both equilibrium and non-equilibrium quantum states of electrons. The book offers various reviews of topics in mesoscopic systems: shot noise measurement, carbon nanotube quantum dots, the Kondo effect in quantum dots, and quantum dots with superconducting leads, which are relevant to probing non-equilibrium physics. These reviews offer particularly valuable resources for readers interested in non-equilibrium physics in mesoscopic systems. Further, the cutting-edge experimental results presented will allow reader to catch up on a vital new trend in the field.

Download or read book Interactions Between Parallel Carbon Nanotube Quantum Dots written by Karin Goß and published by Forschungszentrum Jülich. This book was released on 2011 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Carbon Nanotubes written by Ado Jorio and published by Springer Science & Business Media. This book was released on 2007-12-18 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on the success of its predecessor, Carbon Nanotubes: Synthesis, Structure, Properties and Applications, this second volume focuses on those areas that have grown rapidly in the past few years. Contributing authors reflect the multidisciplinary nature of the book and are all leaders in their particular areas of research. Among the many topics they cover are graphene and other carbon-like and tube-like materials, which are likely to affect and influence developments in nanotubes within the next five years. Extensive use of illustrations enables you to better understand and visualize key concepts and processes.

Download or read book Electronic Properties of Carbon Nanotubes written by Jose Mauricio Marulanda and published by BoD – Books on Demand. This book was released on 2011-07-27 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes (CNTs), discovered in 1991, have been a subject of intensive research for a wide range of applications. These one-dimensional (1D) graphene sheets rolled into a tubular form have been the target of many researchers around the world. This book concentrates on the semiconductor physics of carbon nanotubes, it brings unique insight into the phenomena encountered in the electronic structure when operating with carbon nanotubes. This book also presents to reader useful information on the fabrication and applications of these outstanding materials. The main objective of this book is to give in-depth understanding of the physics and electronic structure of carbon nanotubes. Readers of this book should have a strong background on physical electronics and semiconductor device physics. This book first discusses fabrication techniques followed by an analysis on the physical properties of carbon nanotubes, including density of states and electronic structures. Ultimately, the book pursues a significant amount of work in the industry applications of carbon nanotubes.

Download or read book Electron Transport in Quantum Dots written by Jonathan P. Bird and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: When I was contacted by Kluwer Academic Publishers in the Fall of 200 I, inviting me to edit a volume of papers on the issue of electron transport in quantum dots, I was excited by what I saw as an ideal opportunity to provide an overview of a field of research that has made significant contributions in recent years, both to our understanding of fundamental physics, and to the development of novel nanoelectronic technologies. The need for such a volume seemed to be made more pressing by the fact that few comprehensive reviews of this topic have appeared in the literature, in spite of the vast activity in this area over the course of the last decade or so. With this motivation, I set out to try to compile a volume that would fairly reflect the wide range of opinions that has emerged in the study of electron transport in quantum dots. Indeed, there has been no effort on my part to ensure any consistency between the different chapters, since I would prefer that this volume instead serve as a useful forum for the debate of critical issues in this still developing field. In this matter, I have been assisted greatly by the excellent series of articles provided by the different authors, who are widely recognized as some of the leaders in this vital area of research.

Download or read book Towards the Controllable Quantum States written by Junsaku Nitta and published by World Scientific. This book was released on 2003 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: The realizations of physical systems whose quantum states can be directly manipulated have been pursued for experiments on fundamental problems in quantum mechanics and implementations of quantum information devices. Micro-fabricated superconducting systems and electronic spins are among the most promising candidates. This book contains the newest and most advanced research reports on such materials, called OC Mesoscopic SuperconductivityOCO and OC SpintronicsOCO. The former includes superconductor-semiconductor hybrid systems, very small Josephson junctions, and micron-size SQUIDs. The latter includes the control of spin transports in semiconductor heterostructures, nano-scale quantum dots, and spin injections. Superconductor-ferromagnetic metal hybrid structures are covered by both of the topics.The proceedings have been selected for coverage in: OCo Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)"

Download or read book Shaping the Spectrum of Carbon Nanotube Quantum Dots with Superconductivity and Ferromagnetism for Mesoscopic Quantum Electrodynamics written by Tino Cubaynes and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we study carbon nanotubes based quantum dot circuits embedded in a microwave cavity. This general architecture allows one to simultaneously probe the circuit via quantum transport measurements and using circuit quantum electrodynamics techniques. The two experiments realized in this thesis use metallic contacts of the circuit as a resource to engineer a spin sensitive spectrum in the quantum dots. The first one is a Cooper pair splitter which was originally proposed as a source of non local entangled electrons. By using cavity photons as a probe of the circuit internal dynamics, we observed a charge transition dressed by coherent Cooper pair splitting. Strong charge-photon coupling in a quantum dot circuit was demonstrated for the first time in such a circuit. A new fabrication technique has also been developed to integrate pristine carbon nanotubes inside quantum dot circuits. The purity and tunability of this new generation of devices has made possible the realization of the second experiment. In the latter, we uses two non-collinear spin-valves to create a coherent interface between an electronic spin in a double quantum dot and a photon in a cavity. Highly coherent spin transitions have been observed. We provide a model for the decoherence based on charge noise and nuclear spin fluctuations.

Download or read book Electron Transport in Quantum Dots written by Jonathan P. Bird and published by The Rosen Publishing Group. This book was released on 2003-08-31 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron Transport in Quantum Dots is a timely review covering topics such as the Kondo effect and spin-dependent transport in tunnel coupled dots, quantum chaos in open quantum dots and antidot arrays, and explorations of the novel technological applications of quantum dots and carbon nanotubes. It is unique in that it: - Brings together contributions from some of the most widely-recognized experts in this important field of research; -Provides the most comprehensive, yet wide-ranging, review of this important field to date; - Features a self-contained format that should make it a useful text for introductory graduate studies of this important field. This book will be of interest to researchers, university faculty, and graduate students in physics and electrical engineering, particularly those who are engaged in research into the fundamental properties, and technological applications, of nanostructures and nanoelectronic devices.

Download or read book As grown Carbon Nanotube Quantum Dots with Superconducting Contacts written by Stefan Nau and published by . This book was released on 2014 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ultra High Quality Suspended Carbon Nanotubes written by Jien Cao and published by . This book was released on 2005 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Carbon Nanotube Quantum Dots written by Sami Sapmaz and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Exchange Effects in Carbon Nanotube Quantum Dots written by Christoph Schenke and published by . This book was released on 2008 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Carbon Quantum Dots for Sustainable Energy and Optoelectronics written by Sudip Kumar Batabyal and published by Elsevier. This book was released on 2023-01-14 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Quantum Dots for Sustainable Energy and Optoelectronics reviews the synthesis, properties, and applications of carbon nanodots. This book provides readers with an overview of the key advances in the development of carbon quantum dots including synthesis and surface engineering strategies such as pyrolysis-based synthesis, biomass-based synthesis, functionalization, and other methods toward large-scale development of these carbon nanomaterials. The emerging applications of carbon quantum dots in different fields, such as energy harvesting, energy storage, and biomedical applications, are thoroughly reviewed, emphasizing the impact of enhanced properties of carbon quantum dots for these applications. Carbon Quantum Dots for Sustainable Energy and Optoelectronics is suitable for graduate students, materials scientists, and engineers working in academia and industry. This book is also beneficial for the interdisciplinary community of researchers and practitioners working in the field of nanotechnology. Introduces recent advances in the understanding of carbon quantum dots, including relevant synthesis and surface engineering strategies for their large-scale development Provides an overview of the most relevant applications of carbon quantum dots for the development of sustainable technologies in optoelectronics and energy storage and production Discusses future research directions and remaining challenges towards the commercial translation of carbon quantum dots

Download or read book Magnetism and Spintronics in Carbon and Carbon Nanostructured Materials written by Sekhar Chandra Ray and published by Elsevier. This book was released on 2020-01-15 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetism and Spintronics in Carbon and Carbon Nanostructured Materials offers coverage of electronic structure, magnetic properties and their spin injection, and the transport properties of DLC, graphene, graphene oxide, carbon nanotubes, fullerenes, and their different composite materials. This book is a valuable resource for those doing research or working with carbon and carbon-related nanostructured materials for electronic and magnetic devices. Carbon-based nanomaterials are promising for spintronic applications because their weak spin-orbit (SO) coupling and hyperfine interaction in carbon atoms entail exceptionally long spin diffusion lengths (~100μm) in carbon nanotubes and graphene. The exceptional electronic and transport features of carbon nanomaterials could be exploited to build multifunctional spintronic devices. However, a large spin diffusion length comes at the price of small SO coupling, which limits the possibility of manipulating electrons via an external applied field. Assesses the relative utility of a variety of carbon-based nanomaterials for spintronics applications Analyzes the specific properties that make carbon and carbon nanostructured materials optimal for spintronics and magnetic applications Discusses the major challenges to using carbon nanostructured materials as magnetic agents on a mass scale