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Author : Yuan Ren
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Spin Effects in Quantum Point Contacts written by Yuan Ren and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. M. Bychkov
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (742 download)
Download or read book Spin-Dependent Electron Behaviour in Quantum Point Contacts and Dots written by A. M. Bychkov and published by . This book was released on 2000 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We investigate theoretically the effect of spontaneous electron spin polarization in quantum point contacts and quantum dots. Self-consistent calculation process has been developed in the framework of Kohn-Sham LSDA scheme. The existence of the detected spin-polarized states in the low-density regime can be used to explain an anomalous 0.7-structure in the conductance of quantum point contacts. The properties of the potential device based on such an effect are briefly discussed.
Author : Sebastian von Oehsen
Publisher : Cuvillier Verlag
ISBN 13 : 3867274320
Total Pages : 133 pages
Book Rating : 4.8/5 (672 download)
Download or read book Spin-polarized Currents for Spintronic Devices written by Sebastian von Oehsen and published by Cuvillier Verlag. This book was released on 2007 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Keith Robert Wald
Publisher :
ISBN 13 :
Total Pages : 306 pages
Book Rating : 4.:/5 (33 download)
Download or read book Dynamic Nuclear Polarization with Quantum Point Contacts written by Keith Robert Wald and published by . This book was released on 1995 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Youngsoo Yoon
Publisher :
ISBN 13 :
Total Pages : 149 pages
Book Rating : 4.:/5 (276 download)
Download or read book Readout of Electron Spins in Quantum Point Contacts written by Youngsoo Yoon and published by . This book was released on 2008 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is motivated by recent interest in the binding of single spins on quantum point contacts (QPCs). While this regime is inaccessible to experiments performed on single QPCs, this thesis provides strong evidence for the spin binding by studying the interaction between coupled QPCs, one of which is biased in the regime where the spin binding is expected to occur. Thus, this thesis describes a series of experiments aimed at understanding and manipulating single electron spins confined in QPCs, with the long term goal of the implementation of a QPC-based quantum computer. In these experimental studies, we demonstrate a resonant interaction between closely coupled QPCs due to bound-state formation, and show that this may give rise to robust confinement of single spins, which show clear Zeeman splitting in a magnetic field. Our experimental investigations of the resonance exhibited by coupled QPCs clearly show that this feature is consistent with the Fano form, providing strong independent support for the idea of bound-state formation in QPCs near pinch-off. Although the Fano mechanism is typically the dominant effect responsible for the coupled-QPC interaction, we also demonstrate evidence of a crossover from Fano to Coulomb coupling between the QPCs as their wavefunction overlap, and so the Fano mechanism, is suppressed. We show also that the coupling strength characterizing the Fano effect grows as the two QPCs are brought closer to one another. Finally, we discuss the observation of a novel nonlinear Fano effect, by using source-drain bias spectroscopy of coupled QPCs. The key result here is that the coupling strength between the resonant and non-resonant paths can be tuned in situ, starting from weak coupling in the linear (small source-drain bias) regime but becoming stronger at large bias.
Author : Supriyo Bandyopadhyay
Publisher : CRC Press
ISBN 13 : 148225557X
Total Pages : 650 pages
Book Rating : 4.4/5 (822 download)
Download or read book Introduction to Spintronics written by Supriyo Bandyopadhyay and published by CRC Press. This book was released on 2015-09-18 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Spintronics provides an accessible, organized, and progressive presentation of the quantum mechanical concept of spin and the technology of using it to store, process, and communicate information. Fully updated and expanded to 18 chapters, this Second Edition:Reflects the explosion of study in spin-related physics, addressing seven
Author : Erik Johan Koop
Publisher :
ISBN 13 : 9789036735308
Total Pages : 132 pages
Book Rating : 4.7/5 (353 download)
Download or read book Electron Spin Transport in Quantum Dots and Point Contacts written by Erik Johan Koop and published by . This book was released on 2008 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Partha Pratim Das
Publisher :
ISBN 13 :
Total Pages : 135 pages
Book Rating : 4.:/5 (818 download)
Download or read book Generation of Spin Polarization in Side-gated Inas Quantum Point Contact written by Partha Pratim Das and published by . This book was released on 2012 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation explores the use of side-gated semiconductor quantum point contacts (QPCs) to generate strongly spin polarized current by purely electrical means. An anomalous conductance plateau (at conductance value, G = 0.5x(2e2/h)) was observed [P. Debray et al., Nature Nanotechnology 4, 759 (2009)] in an asymmetrically-biased, InAs quantum point contact with in-plane side gates, at 4.2 Kelvin in the ballistic transport regime. This was a clear experimental signature of spontaneous spin polarization in the narrow channel of the QPC. A non-equilibrium Green's function (NEGF) simulation revealed that three ingredients are necessary to create the spin polarization: an asymmetric lateral confinement, a lateral spin-orbit coupling (LSOC) induced by the lateral confining potential of the QPC, and a strong electron-electron interaction. In order to use such QPC devices to make all-electric spin valves, it is necessary to probe the sensitivity of these three ingredients to the bias difference between the two side gates that confine the electrons in the narrow channel. Towards that goal, this thesis shows experimentally that the anomalous conductance plateaus are quite robust and remain over a wide range of asymmetric bias voltages. In addition, a very systematic study is conducted to understand the appearance of conductance anomalies which range from 0.4 to 0.7x(2e2/h) depending on the biasing conditions. These results are interpreted as evidence for the sensitivity of the QPC spin polarization to the defects (surface roughness and impurity (dangling bonds) scattering) generated during the etching process that defines the QPC side walls or gates. This assertion is supported by NEGF simulations of the conductance of a QPC in presence of dangling bonds on its walls. We also show that a spin polarization over 90% can be achieved despite the presence of these defects. NEGF simulations show that the maximum spin polarization is not necessarily reached where the conductance of the channel is equal to 0.5x(2e2/h). We propose developing QPC devices in series at elevated temperature as a mean to build an all-electric spin valve.
Author :
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (946 download)
Download or read book Quantum and Collective Effects in Information Processing and Communication written by and published by . This book was released on 1999 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The original aim of this MURI was to combine an experimental effort to develop tools to manipulate quantum coherence in the solid state. based on metallic wires, quantum point contacts, and the quantum Hall effect, with theoretical efforts aimed at understanding device architectures and the information capacity of quantum channels. The Marcus group aims to develop locally controlled magnetic fields in the vicinity of quantum point contacts and to develop novel heterostructure-based spin detectors. Both Marcus and Yamamoto have investigated the so-called 0.7 structure as a means of generating spin filtering properties and are actively pursuing the use of this feature in a quantum point contact as a spin filter. Marcus has demonstrated that the magnetic orientation of the gates can be flipped using on-chip current lines. Yamamoto is presently working to realize this device in a Hall-bar geometry in a high mobility GaAs heterostucture. Gershenson has focused on the role of electron spin in the 2D metal insulator transition, which may have important implications for 2D spin-tronic transisitors in semiconductors.
Author :
Publisher :
ISBN 13 :
Total Pages : 149 pages
Book Rating : 4.:/5 (319 download)
Download or read book Spontaneous Spin Polarization Due to Lateral Spin Orbit Coupling in InAs Quantum Point Contacts written by and published by . This book was released on 2007 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation reports the first experimental observation of spontaneous spin polarization due to lateral spin orbit coupling (LSOC) in side- gated (SG) quantum point contacts (QPCs). The QPC devices are fabricated on InAs/InGaAs quantum well structures using e-beam lithography. The low band gap InAs semiconductor was chosen because of its large intrinsic spin-orbit coupling. The side gates are realized by wet etching technique which is optimized to pattern the QPC devices. The width of the QPC is varied from 200 nm to 500 nm, while the length of the QPC is kept in the range 150-200 nm. The gradient in the lateral potential confinement in a side gated (SG) quantum point contact (QPC) causes a spin-orbit coupling (SOC). This LSOC induces a spontaneous spin polarization of opposite nature at the two edges of the QPC in the absence of any applied magnetic field. We have observed an anomalous conductance plateau at G @ 0.5 (2e2/h) (0.5 structure) in the SG QPCs fabricated on InAs/InGaAs QW structures. The 0.5 structure moves up in perpendicular magnetic field and approaches the normal conduction quantization at G = (2e2/h) in high magnetic field, whereas in-plane magnetic field has no effect on it. The evolution in magnetic field clearly indicates LSOC is responsible for the 0.5 structure. We believe it is the asymmetry in the confining potential of the QPC that leads to a net spin polarization giving the 0.5 structure. By electrically modulating the asymmetry of the QPC confinement, we have succeeded in making this structure appear and disappear. Such a QPC can conceivably be used as a spin polarizer or detector on demand by tuning the gate voltages. We also have proposed a dual-QPC device to experimentally validate the spin polarization by electrical means.
Author : Mikhail I. Dyakonov
Publisher : Springer
ISBN 13 : 3319654365
Total Pages : 546 pages
Book Rating : 4.3/5 (196 download)
Download or read book Spin Physics in Semiconductors written by Mikhail I. Dyakonov and published by Springer. This book was released on 2017-10-04 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers an extensive introduction to the extremely rich and intriguing field of spin-related phenomena in semiconductors. In this second edition, all chapters have been updated to include the latest experimental and theoretical research. Furthermore, it covers the entire field: bulk semiconductors, two-dimensional semiconductor structures, quantum dots, optical and electric effects, spin-related effects, electron-nuclei spin interactions, Spin Hall effect, spin torques, etc. Thanks to its self-contained style, the book is ideally suited for graduate students and researchers new to the field.
Author : Alexandros Shailos
Publisher :
ISBN 13 :
Total Pages : 222 pages
Book Rating : 4.:/5 (612 download)
Download or read book Spin-dependent Transport Phenomena in Single and Coupled Quantum Point Contacts written by Alexandros Shailos and published by . This book was released on 2004 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jayasimha Atulasimha
Publisher : John Wiley & Sons
ISBN 13 : 1118869265
Total Pages : 356 pages
Book Rating : 4.1/5 (188 download)
Download or read book Nanomagnetic and Spintronic Devices for Energy-Efficient Memory and Computing written by Jayasimha Atulasimha and published by John Wiley & Sons. This book was released on 2016-03-07 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomagnetic and spintronic computing devices are strong contenders for future replacements of CMOS. This is an important and rapidly evolving area with the semiconductor industry investing significantly in the study of nanomagnetic phenomena and in developing strategies to pinpoint and regulate nanomagnetic reliably with a high degree of energy efficiency. This timely book explores the recent and on-going research into nanomagnetic-based technology. Key features: Detailed background material and comprehensive descriptions of the current state-of-the-art research on each topic. Focuses on direct applications to devices that have potential to replace CMOS devices for computing applications such as memory, logic and higher order information processing. Discusses spin-based devices where the spin degree of freedom of charge carriers are exploited for device operation and ultimately information processing. Describes magnet switching methodologies to minimize energy dissipation. Comprehensive bibliographies included for each chapter enabling readers to conduct further research in this field. Written by internationally recognized experts, this book provides an overview of a rapidly burgeoning field for electronic device engineers, field-based applied physicists, material scientists and nanotechnologists. Furthermore, its clear and concise form equips readers with the basic understanding required to comprehend the present stage of development and to be able to contribute to future development. Nanomagnetic and Spintronic Devices for Energy-Efficient Memory and Computing is also an indispensable resource for students and researchers interested in computer hardware, device physics and circuits design.
Author : Joseph Albert Sulpizio
Publisher : Stanford University
ISBN 13 :
Total Pages : 171 pages
Book Rating : 4.F/5 ( download)
Download or read book Quantum Transport in One-dimensional Nanostructures written by Joseph Albert Sulpizio and published by Stanford University. This book was released on 2011 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Marco Saraniti
Publisher : Springer Science & Business Media
ISBN 13 : 3540365885
Total Pages : 370 pages
Book Rating : 4.5/5 (43 download)
Download or read book Nonequilibrium Carrier Dynamics in Semiconductors written by Marco Saraniti and published by Springer Science & Business Media. This book was released on 2007-12-14 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Nonequilibrium Carrier Dynamics in Semiconductors" is a well-established, specialist conference, held every two years, covering a range of topics of current interest to R&D in semiconductor physics/materials, optoelectronics, nanotechnology, quantum information processing. Papers accepted for publication are selected and peer-reviewed by members of the Program Committee during the conference to ensure both rapid and high-quality processing.
Author : Muhammad Javaid Iqbal
Publisher :
ISBN 13 : 9789036756006
Total Pages : 159 pages
Book Rating : 4.7/5 (56 download)
Download or read book Electron Many-body Effects in Quantum Point Contacts written by Muhammad Javaid Iqbal and published by . This book was released on 2012 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sankar Das Sarma
Publisher : John Wiley & Sons
ISBN 13 : 3527617264
Total Pages : 444 pages
Book Rating : 4.5/5 (276 download)
Download or read book Perspectives in Quantum Hall Effects written by Sankar Das Sarma and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery of the quantized and fractional Quantum Hall Effect phenomena is among the most important physics findings in the latter half of this century. The precise quantization of the electrical resistance involved in the quantized Hall effect phenomena has led to the new definition of the resistance standard and has metrologically affected all of science and technology. This resource consists of contributions from the top researchers in the field who present recent experimental and theoretical developments. Each chapter is self-contained and includes its own set of references guiding readers to original papers and further reading on the topic.
