Download or read book Dynamics of Electron and Nuclear Spin Interaction in Laser Assisted Nuclear Magnetic Resonance Spectroscopy of Gallium Arsenide Nanostructures written by Wieland Alexander Worthoff and published by . This book was released on 2011 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Polarization of Nuclear Spins in Gallium Arsenide written by Anant Krishna Paravastu and published by . This book was released on 2004 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Magnetic Resonance in Gallium Arsenide written by Michael Francis Finch and published by . This book was released on 1987 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear Magnetic Resonance (NMR) lineshapes of 69Ga in GaAs:In were studied for two different levels of indium dopant. The lineshapes were developed by fourier analysis of the spin echoes. First order quadrupole effects manifested themselves as wings in the lineshapes. As expected the wings were larger in the more heavily doped sample. The dependence of the second moment of the lineshapes on the orientation of the crystal in the field supports a continuous solid model of the strain, in which the strain attenuates as the cube of the distance from the impurity site. Because of noise levels the model can only be confirmed for distances greater than 10A from the impurity, and no determination of the strain on the first through eighth shells surrounding the impurity can be made. Keywords: Gallium Arsenide semiconductors, Semiconductors, Nuclear magnetic resonance spectroscopy, Spectroscopy.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Photon s Magnetic Field written by Myron Wyn Evans and published by World Scientific. This book was released on 1992 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of papers on a fundamentally new concept in physics — the photon's magnetic field, Bπ. It discusses various applications of Bπ to predict the existence of new magneto-optic phenomena and to reinterpret some of the fundamentals of optics in terms of Bπ of the photon. One of these new phenomena, optical NMR spectroscopy, has already been verified experimentally, leading to a new analytical technique of widespread potential utility.
Download or read book Nuclear magnetic resonance and electron spin resonance spectra index written by and published by . This book was released on 1958 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Phase Conjugation in Nuclear Magnetic Resonance written by Myron Wyn Evans and published by . This book was released on 1990 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time sequenced Optical Nuclear Magnetic Resonance of Gallium Arsenide written by Steven Keith Buratto and published by . This book was released on 1993 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular and Spin Dynamics in Solid State Nuclear Magnetic Resonance Spectroscopy written by Douglas Charles Maus and published by . This book was released on 1996 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spin Dynamics of N doped Gallium Arsenide written by Matthew David Hodgson and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spin Dynamics of Equilibrium Electrons in Gallium Arsenide written by Georg Martin Müller and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gamma ray and Electron Spectroscopy in Nuclear Physics written by Hiroyasu Ejiri and published by Oxford University Press, USA. This book was released on 1989 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces graduate students to the gamma-ray and conversion-electron spectroscopic methods, which have shed new light on nuclear structure and reaction mechanisms. The simplicity and familiarity of the electromagnetic interaction involved gives accurate values for many nuclear quantities, and both static and dynamic properties can be investigated over a wide range of excitation energies. More experienced nuclear physicists will benefit by the book's review of recent developments in the field, including the development of new experimental techniques such as gamma-detector assemblies, electron spectrometers, and measurements of electromagnetic moments. The book is distinguished by a careful balance between the presentation of theoretical concepts and experimental methods.
Download or read book Pulsed Nuclear magnetic resonance and Nuclear Spin Dynamics in AlP written by Yin-shiong Hwang and published by . This book was released on 1975 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Pumping and Photoluminescence Detection of Spin polarized Electrons in Uniaxially Stressed Gallium Arsenide written by Paul Zorabedian and published by . This book was released on 1982 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Indium Gallium arsenide Quantum Dot Materials for Solar Cell Applications written by Anup Pancholi and published by ProQuest. This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The last few years have seen rapid advances in nanoscience and nanotechnology, allowing unprecedented manipulation of nanostructures controlling solar energy capture, conversion, and storage. Quantum confined nanostructures, such as quantum wells (QWs) and quantum dots (QDs) have been projected as potential candidates for the implementation of some high efficiency photovoltaic device concepts, including the intermediate band solar cell (IBSC). In this dissertation research, we investigated multiple inter-related themes, with the main objective of providing a deeper understanding of the physical and optical properties of QD structures relevant to the IBSC concept. These themes are: (i) Quantum engineering and control of energy levels in QDs, via a detailed study of the electronic coupling in multilayer QD structures; (ii) Controlled synthesis of well-organized, good quality, high volume density, and uniform-size QD arrays, in order to maximize the absorption efficiency and to ensure the coupling between the dots and the formation of the minibands; and (iii) Characterization of carrier dynamics and development of techniques to enhance the charge transport and efficient light harvesting. A major issue in a QD-based IBSC is the occurrence of charge trapping, followed by recombination in the dots, which results in fewer carriers being collected and hence low quantum efficiency. In order to collect most of the light-generated carriers, long radiative lifetimes, higher mobilities, and a lower probability of non-radiative recombination events in the solar cell would be desirable. QD size-dependent radiative lifetime and electronic coupling in multilayer QD structures were studied using photoluminescence (PL) and time-resolved photoluminescence (TRPL). For the uncoupled QD structures with thick barriers between the adjacent QD layers, the radiative lifetime was found to increase with the QD size, which was attributed to increased oscillator strength in smaller size dots. On the other hand, in the sample with thin barrier and electronically coupled QDs, the radiative lifetime increases and later decreases with the dot size. This is due to the enhancement of the oscillator strength in the larger size, coherently coupled QDs. In order to improve the quality of multi-layer QD structures, strain compensated barriers were introduced between the QD layers grown on off-oriented GaAs (311)B substrate. The QD shape anisotropy resulted from the growth on off-oriented substrate was studied using polarization-dependent PL measurements both on the surface and the edge of the samples. The transverse electric mode of the edge-emitted PL showed about 5° deviation from the sample surface for the dots grown on (311)B GaAs, which was attributed to the tilted vertical alignment and the shape asymmetry of dots resulted from the substrate orientation. Significant structural quality improvements were attained by introducing strain compensated barriers, i.e., reduction of misfit dislocations and uniform dot size formation. Longer lifetime (~1 ns) and enhanced PL intensity at room temperature were obtained, compared to those in conventional multilayer (In, Ga)As/GaAs QD structures. A significant increase in the open circuit voltage (V oc) was observed for the solar cell devices fabricated with the strain compensated structures. A major issue in a QD IBSC is the occurrence of charge trapping, followed by recombination in the dots, which results in fewer carriers being collected, and hence low quantum efficiency. We proposed and studied a novel structure, in which InAs QDs were sandwiched between GaAsSb (12% Sb) strain-reducing layers (SRLs) with various thicknesses. Both short (~1 ns) and long (~4-6 ns) radiative lifetimes were measured in the dots and were attributed to type-I and type-II transitions, respectively, which were induced by the band alignment modifications at the QD/barrier interface in the structures analyzed, due to the quantum confinement effect resulting from different GaAsSb barrier thicknesses. Based on our findings, a structure with type-II QD/barrier interface with relatively long radiative recombination lifetime may be a viable candidate in designing IBSC.
Download or read book Progress in Nuclear Magnetic Resonance Spectroscopy written by and published by . This book was released on 1973 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
