Spectroscopy Of Single Free Standing Quantum Wells

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Spectroscopy of Single Free Standing Quantum Wells

Author : M. D. Williams
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Spectroscopy of Single Free Standing Quantum Wells by : M. D. Williams

Download or read book Spectroscopy of Single Free Standing Quantum Wells written by M. D. Williams and published by . This book was released on 2006 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We investigated the interaction of quantum confined exciton states GaAs quantum wells with native surface states. Single molecule photoluminescence (PL) spectroscopy, developed by T. Huser at LLNL was used to probe the unique bare quantum wells in the free standing quantum well structure. The latter was developed by the M.D. Williams at Clark Atlanta University. The goals of the project during this budget cycle were to procure samples containing GaAs free standing QWs, identify suitable regions for PL analysis at Lawrence Livermore, analyze the structures at room temperature and at liquid nitrogen temperatures. The specific regions of interest on the sample structures were identified by scanning electron microscopy at Clark Atlanta prior to transport to LLNL. Previous attempts at other facilities using NSOM, cathodoluminescence, and conventional PL showed little luminescence activity at room temperature from the 200 {angstrom} thick wells. This suggested either excess recombination due to surface states in the quantum well region or insufficient absorption length for photoluminescence. The literature suggested that the effect of the defects could be eliminated by reducing the sample temperature below their associated activation energies. In our previous subcontract work with LLNL, a significant amount of effort was expended to modify the apparatus to allow low temperature measurements. The modifications were not successful and we concluded that in order to do the measurements at low temperature we would need to purchase a commercial optical cryostat to get reliable results. Ms. Rochelle Bryant worked during the summer as an intern at LLNL on the project under the supervision of C. Hollars and in collaboration with T. Huser and found that PL emission could be obtained at room temperature. This was a surprising result as the literature and our experience shows that there is no PL emission from GaAs at room temperature. We speculate that this is due to the small interaction region excited by the laser source. We proceeded with the project using this new found room temperature capability and have analyzed the effect of various chemical species on the PL emission from the GaAs QWs. We were able to observe some significant intensity modifications of the PL spectra with chemical adsorbants. This progress holds promise for the development of this structure as a chemical or biological sensor.

Photoluminescence Spectroscopy of Single Free Standing Quantum Wells

Author : Adowa K. Gyekye
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (875 download)

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Book Synopsis Photoluminescence Spectroscopy of Single Free Standing Quantum Wells by : Adowa K. Gyekye

Download or read book Photoluminescence Spectroscopy of Single Free Standing Quantum Wells written by Adowa K. Gyekye and published by . This book was released on 2004 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Room Temperature Photoluminescence Spectroscopy of Single Free Standing Quantum Wells

Author : Ngoneh Jallow
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.:/5 (875 download)

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Book Synopsis Room Temperature Photoluminescence Spectroscopy of Single Free Standing Quantum Wells by : Ngoneh Jallow

Download or read book Room Temperature Photoluminescence Spectroscopy of Single Free Standing Quantum Wells written by Ngoneh Jallow and published by . This book was released on 2007 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Nonlinear Spectroscopy of Solids

Author : Baldassare di Bartolo
Publisher : Springer Science & Business Media
ISBN 13 : 1489911901
Total Pages : 654 pages
Book Rating : 4.4/5 (899 download)

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Book Synopsis Nonlinear Spectroscopy of Solids by : Baldassare di Bartolo

Download or read book Nonlinear Spectroscopy of Solids written by Baldassare di Bartolo and published by Springer Science & Business Media. This book was released on 2013-11-21 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents an account of the course "Nonlinear Spectroscopy of Solids: Advances and Applications" held in Erice, Italy, from June 16 to 30, 1993. This meeting was organized by the International School of Atomic and Molecular Spectroscopy of the "Ettore Majorana" Centre for Scientific Culture. The purpose of this course was to present and discuss physical models, mathematical formalisms, experimental techniques, and applications relevant to the subject of nonlinear spectroscopy of solid state materials. The universal availability and application of lasers in spectroscopy has led to the widespread observation of nonlinear effects in the spectroscopy of materials. Nonlinear spectroscopy encompasses many physical phenomena which have their origin in the monochromaticity, spectral brightness, coherence, power density and tunability of laser sources. Conventional spectroscopy assumes a linear dependence between the applied electromagnetic field and the induced polarization of atoms and molecules. The validity of this assumption rests on the fact that even the most powerful conventional sources of light produce a light intensity which is not strong enough to equalize the rate of stimulated emission and that of the experimentally observed decay. A different situation may arise when laser light sources are used, particularly pulsed lasers. The use of such light sources can make the probability of induced emission comparable to, or even greater than, the probability of the observed decay; in such cases the nonlinearity of the response of the system is revealed by the experimental data and new properties, not detectable by conventional spectroscopy, will emerge.

Low-dimensional Semiconductors

Author : M. J. Kelly
Publisher : Clarendon Press
ISBN 13 : 0191590096
Total Pages : 569 pages
Book Rating : 4.1/5 (915 download)

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Book Synopsis Low-dimensional Semiconductors by : M. J. Kelly

Download or read book Low-dimensional Semiconductors written by M. J. Kelly and published by Clarendon Press. This book was released on 1995-11-23 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text is a first attempt to pull together the whole of semiconductor science and technology since 1970 in so far as semiconductor multilayers are concerned. Material, technology, physics and device issues are described with approximately equal emphasis, and form a single coherant point of view. The subject matter is the concern of over half of today's active semiconductor scientists and technologists, the remainder working on bulk semiconductors and devices. It is now routine to design and the prepare semiconductor multilayers at a time, with independent control over the dropping and composition in each layer. In turn these multilayers can be patterned with features that as a small as a few atomic layers in lateral extent. The resulting structures open up many new ares of exciting solid state and quantum physics. They have also led to whole new generations of electronic and optoelectronic devices whose superior performance relates back to the multilayer structures. The principles established in the field have several decades to go, advancing towards the ultimate of materials engineering, the design and preparation of solids atom by atom. The book should appeal equally to physicists, electronic engineers and materials scientists.

Science and Engineering of One- and Zero-Dimensional Semiconductors

Author : Steven P. Beaumont
Publisher : Springer Science & Business Media
ISBN 13 : 1468457330
Total Pages : 338 pages
Book Rating : 4.4/5 (684 download)

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Book Synopsis Science and Engineering of One- and Zero-Dimensional Semiconductors by : Steven P. Beaumont

Download or read book Science and Engineering of One- and Zero-Dimensional Semiconductors written by Steven P. Beaumont and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises the proceedings of the NATO Advanced Research Workshop on the Science and Engineering of 1- and O-dimensional semiconductors held at the University of Cadiz from 29th March to 1st April 1989, under the auspices of the NATO International Scientific Exchange Program. There is a wealth of scientific activity on the properties of two-dimensional semiconductors arising largely from the ease with which such structures can now be grown by precision epitaxy techniques or created by inversion at the silicon-silicon dioxide interface. Only recently, however, has there burgeoned an interest in the properties of structures in which carriers are further confined with only one or, in the extreme, zero degrees of freedom. This workshop was one of the first meetings to concentrate almost exclusively on this subject: that the attendance of some forty researchers only represented the community of researchers in the field testifies to its rapid expansion, which has arisen from the increasing availability of technologies for fabricating structures with small enough (sub - O. I/tm) dimensions. Part I of this volume is a short section on important topics in nanofabrication. It should not be assumed from the brevity of this section that there is little new to be said on this issue: rather that to have done justice to it would have diverted attention from the main purpose of the meeting which was to highlight experimental and theoretical research on the structures themselves.

Spectroscopy of Semiconductor Microstructures

Author : Gerhard Fasol
Publisher : Springer Science & Business Media
ISBN 13 : 1475765657
Total Pages : 661 pages
Book Rating : 4.4/5 (757 download)

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Book Synopsis Spectroscopy of Semiconductor Microstructures by : Gerhard Fasol

Download or read book Spectroscopy of Semiconductor Microstructures written by Gerhard Fasol and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a NATO ARW held in Venice, Italy, May 9-13, 1989

Diverse Quantization Phenomena in Layered Materials

Author : Chiun-Yan Lin
Publisher : CRC Press
ISBN 13 : 1000760294
Total Pages : 335 pages
Book Rating : 4.0/5 (7 download)

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Book Synopsis Diverse Quantization Phenomena in Layered Materials by : Chiun-Yan Lin

Download or read book Diverse Quantization Phenomena in Layered Materials written by Chiun-Yan Lin and published by CRC Press. This book was released on 2019-12-06 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph offers a comprehensive overview of diverse quantization phenomena in layered materials, covering current mainstream experimental and theoretical research studies, and presenting essential properties of layered materials along with a wealth of figures. This book illustrates commonly used synthesis methods of these 2D materials and compares the calculated results and experimental measurements, including novel features not yet reported. The book also discusses experimental measurements of magnetic quantization, theoretical modeling for studying systems and covers diversified magneto-electronic properties, magneto-optical selection rules, unusual quantum Hall conductivities, and single- and many-particle magneto-Coulomb excitations. Rich and unique behaviors are clearly revealed in few-layer graphene systems with distinct stacking configuration, stacking-modulated structures, silicon-doped lattices, bilayer silicene/germanene systems with the bottom-top and bottom-bottom buckling structures, monolayer and bilayer phosphorene systems, and quantum topological insulators. The generalized tight-binding model, the static and dynamic Kubo formulas, and the random-phase approximation are developed/modified to thoroughly explore the fundamental properties and propose the concise physical pictures. Different high-resolution experimental measurements are discussed in detail, and they are consistent with the theoretical predictions. Aimed at readers working in materials science, physics, and engineering this book should be useful for potential applications in energy storage, electronic devices, and optoelectronic devices.

Intersubband Transitions in Quantum Wells

Author : Emmanuel Rosencher
Publisher : Springer Science & Business Media
ISBN 13 : 1461533465
Total Pages : 341 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Intersubband Transitions in Quantum Wells by : Emmanuel Rosencher

Download or read book Intersubband Transitions in Quantum Wells written by Emmanuel Rosencher and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the lectures delivered at the NATO Advanced Research Workshop on the "Intersubband Transistions in Quantum Wells" held in Cargese, France, between the t 9 h and the 14th of September 1991. The urge for this Workshop was justified by the impressive growth of work dealing with this subject during the last two or three years. Indeed, thanks to recent progresses of epitaxial growth techniques, such as Molecular Beam Epitaxy, it is now possible to realize semiconductor layers ( e.g. GaAs) with thicknesses controlled within one atomic layer, sandwiched between insulating layers (e.g. AlGaAs). When the semiconducting layer is very thin, i.e. less than 15 nm, the energy of the carriers corresponding to their motion perpendicular to these layers is quantized, forming subbands of allowed energies. Because of the low effective masses in these semiconducting materials, the oscillator strengths corresponding to intersubband transitions are extremely large and quantum optical effects become giant in the 5 - 20 ~ range: photoionization, optical nonlinearities, ... Moreover, a great theoretical surprise is that - thanks to the robustness of the effective mass theory - these quantum wells are a real life materialization of our old text book one-dimensional quantum well ideal. Complex physical phenomena may then be investigated on a simple model system.

Quantum Transport in Ultrasmall Devices

Author : David K. Ferry
Publisher : Springer Science & Business Media
ISBN 13 : 1461519675
Total Pages : 542 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Quantum Transport in Ultrasmall Devices by : David K. Ferry

Download or read book Quantum Transport in Ultrasmall Devices written by David K. Ferry and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: The operation of semiconductor devices depends upon the use of electrical potential barriers (such as gate depletion) in controlling the carrier densities (electrons and holes) and their transport. Although a successful device design is quite complicated and involves many aspects, the device engineering is mostly to devise a "best" device design by defIning optimal device structures and manipulating impurity profIles to obtain optimal control of the carrier flow through the device. This becomes increasingly diffIcult as the device scale becomes smaller and smaller. Since the introduction of integrated circuits, the number of individual transistors on a single chip has doubled approximately every three years. As the number of devices has grown, the critical dimension of the smallest feature, such as a gate length (which is related to the transport length defIning the channel), has consequently declined. The reduction of this design rule proceeds approximately by a factor of 1. 4 each generation, which means we will be using 0. 1-0. 15 ). lm rules for the 4 Gb chips a decade from now. If we continue this extrapolation, current technology will require 30 nm design rules, and a cell 3 2 size

Spectroscopy of GaAs Quantum Wells

Author : Lawrence Camest West
Publisher :
ISBN 13 :
Total Pages : 430 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Spectroscopy of GaAs Quantum Wells by : Lawrence Camest West

Download or read book Spectroscopy of GaAs Quantum Wells written by Lawrence Camest West and published by . This book was released on 1985 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:

纳米技术中的显微学手册

Author :
Publisher : 清华大学出版社有限公司
ISBN 13 : 9787302111887
Total Pages : 368 pages
Book Rating : 4.1/5 (118 download)

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Book Synopsis 纳米技术中的显微学手册 by :

Download or read book 纳米技术中的显微学手册 written by and published by 清华大学出版社有限公司. This book was released on 2006 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: 本书是一本关于各种显微学的原理及其在该迅猛发展的领域内应用的综述参考书。本书涵盖的范围包括共聚焦光学显微镜、扫描近场光学显微镜、各种扫描探针显微术、离子和电子显微镜、电子能量损失和X射线谱等。

Compound Semiconductors Strained Layers and Devices

Author : Suresh Jain
Publisher : Springer Science & Business Media
ISBN 13 : 1461544416
Total Pages : 345 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Compound Semiconductors Strained Layers and Devices by : Suresh Jain

Download or read book Compound Semiconductors Strained Layers and Devices written by Suresh Jain and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, extensive work has been done on strain, dislocations and mechanical properties of strained layers. Although it is not possible to describe all this work in a monograph of this size, Compound Semiconductors Strained Layers and Devices provides an overview with sufficient detail to cover all the essential aspects of recent developments in the field. The book concentrates on compound semiconductors with emphasis on wideband gap II-VI and III-Nitride semiconductors. GeSi strained layers are discussed for comparison to clarify the underlying physics. The effects of strain on band structure, transport, and optical properties of both the zinc blende and the wurtzite compound semiconductors are discussed, as are Piezoelectric Effects and Quantum Confined Stark Effects. Magnetic polarons in diluted II-VI magnetic polarons are also covered. Among the applications, blue and green LEDs and LDs and mid-IR LDs are included. A whole chapter is devoted to these devices. Another chapter examines transistors based on conventional III-V, II-VI and III-nitride semiconductors. The subject matter is treated at a level appropriate for students and senior researchers interested in material science, and in designing and modeling semiconductor devices. It will also be useful to engineers and material scientists concerned with the effects of strain on the mechanical properties of crystalline layers of any material.

Chemical Vapour Deposition (CVD)

Author : Kwang-Leong Choy
Publisher : CRC Press
ISBN 13 : 1000690733
Total Pages : 417 pages
Book Rating : 4.0/5 (6 download)

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Book Synopsis Chemical Vapour Deposition (CVD) by : Kwang-Leong Choy

Download or read book Chemical Vapour Deposition (CVD) written by Kwang-Leong Choy and published by CRC Press. This book was released on 2019-06-07 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a timely and complete overview on chemical vapour deposition (CVD) and its variants for the processing of nanoparticles, nanowires, nanotubes, nanocomposite coatings, thin and thick films, and composites. Chapters discuss key aspects, from processing, material structure and properties to practical use, cost considerations, versatility, and sustainability. The author presents a comprehensive overview of CVD and its potential in producing high performance, cost-effective nanomaterials and thin and thick films. Features Provides an up-to-date introduction to CVD technology for the fabrication of nanomaterials, nanostructured films, and composite coatings Discusses processing, structure, functionalization, properties, and use in clean energy, engineering, and biomedical grand challenges Covers thin and thick films and composites Compares CVD with other processing techniques in terms of structure/properties, cost, versatility, and sustainability Kwang-Leong Choy is the Director of the UCL Centre for Materials Discovery and Professor of Materials Discovery in the Institute for Materials Discovery at the University College London. She earned her D.Phil. from the University of Oxford, and is the recipient of numerous honors including the Hetherington Prize, Oxford Metallurgical Society Award, and Grunfeld Medal and Prize from the Institute of Materials (UK). She is an elected fellow of the Institute of Materials, Minerals and Mining, and the Royal Society of Chemistry.

Elementary Processes in Excitations and Reactions on Solid Surfaces

Author : Ayao Okiji
Publisher : Springer Science & Business Media
ISBN 13 : 3642611850
Total Pages : 250 pages
Book Rating : 4.6/5 (426 download)

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Book Synopsis Elementary Processes in Excitations and Reactions on Solid Surfaces by : Ayao Okiji

Download or read book Elementary Processes in Excitations and Reactions on Solid Surfaces written by Ayao Okiji and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elementary Processes in Excitations and Reactions on Solid Surfaces explores the fundamental nature of dynamics on solid surfaces. Attempts are made to reveal various aspects of elementary processes in excitations and reactions on solid surfaces by recent theoretical and experimental developments of the subjects such as molecular beams interacting with surfaces, ion beam scattering, laser-induced dynamical processes, electronically induced dynamical processes, and optical properties of solid surfaces. This volume is devided into three parts. Part I is concerned mainly with the rich reaction dynamics on potential-energy surfaces. Part II is devoted to the interplay of excitations. In Part III, new and rapidly developing methods are introduced.

Thermoelectrics Handbook

Author : D.M. Rowe
Publisher : CRC Press
ISBN 13 : 9780849322648
Total Pages : 1028 pages
Book Rating : 4.3/5 (226 download)

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Book Synopsis Thermoelectrics Handbook by : D.M. Rowe

Download or read book Thermoelectrics Handbook written by D.M. Rowe and published by CRC Press. This book was released on 2005-12-09 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ten years ago, D.M. Rowe introduced the bestselling CRC Handbook of Thermoelectrics to wide acclaim. Since then, increasing environmental concerns, desire for long-life electrical power sources, and continued progress in miniaturization of electronics has led to a substantial increase in research activity involving thermoelectrics. Reflecting the latest trends and developments, the Thermoelectrics Handbook: Macro to Nano is an extension of the earlier work and covers the entire range of thermoelectrics disciplines. Serving as a convenient reference as well as a thorough introduction to thermoelectrics, this book includes contributions from 99 leading authorities from around the world. Its coverage spans from general principles and theoretical concepts to material preparation and measurements; thermoelectric materials; thermoelements, modules, and devices; and thermoelectric systems and applications. Reflecting the enormous impact of nanotechnology on the field-as the thermoelectric properties of nanostructured materials far surpass the performance of conventional materials-each section progresses systematically from macro-scale to micro/nano-scale topics. In addition, the book contains an appendix listing major manufacturers and suppliers of thermoelectric modules. There is no longer any need to spend hours plodding through the journal literature for information. The Thermoelectrics Handbook: Macro to Nano offers a timely, comprehensive treatment of all areas of thermoelectrics in a single, unified reference.

Physics Of Semiconductors - Proceedings Of The 20th International Conference (In 3 Volumes)

Author : E M Anastassakis
Publisher : World Scientific
ISBN 13 : 9814583634
Total Pages : 2768 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Physics Of Semiconductors - Proceedings Of The 20th International Conference (In 3 Volumes) by : E M Anastassakis

Download or read book Physics Of Semiconductors - Proceedings Of The 20th International Conference (In 3 Volumes) written by E M Anastassakis and published by World Scientific. This book was released on 1990-11-29 with total page 2768 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gathering top experts in the field, the 20th ICPS proceedings reviews the progress in all aspects of semiconductor physics. The proceedings will include state-of-the-art lectures with special emphasis on exciting new developments. It should serve as excellent material for researchers in this and related fields.