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Contribution A Letude De La Magnetoresistance Negative Dans Gaas Et Inp Dopes Au Voisinage De La Transition Metal Isolant
Download Contribution A Letude De La Magnetoresistance Negative Dans Gaas Et Inp Dopes Au Voisinage De La Transition Metal Isolant full books in PDF, epub, and Kindle. Read online Contribution A Letude De La Magnetoresistance Negative Dans Gaas Et Inp Dopes Au Voisinage De La Transition Metal Isolant ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Contribution à l'étude de la magnétorésistance négative dans GaAs et InP dopés au voisinage de la transition métal-isolant by : Jean-Marc Monsterleet
Download or read book Contribution à l'étude de la magnétorésistance négative dans GaAs et InP dopés au voisinage de la transition métal-isolant written by Jean-Marc Monsterleet and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail a pour objet l'etude du comportement de la conductivite en fonction du champ magnetique et de la temperature dans deux types de semi-conducteurs iii-v: gaas et inp. Les echantillons ont des concentrations en porteurs a temperature ambiante qui les situent au voisinage immediat de la transition metal-isolant. Dans cette region critique, les mecanismes de conduction sont influences par des interferences quantiques et des interactions entre les electrons. Les corrections quantiques inherentes a ces effets donnent lieu notamment a l'apparition d'une magnetoresistance (mr) negative importante dans nos echantillons (plusieurs dizaines de %). Nous procedons tout d'abord a la caracterisation des differents regimes de conduction dans toute la gamme de champ magnetique et de temperature. Nous montrons que les echantillons de gaas sont metalliques et que celui d'inp est isolant. Cette etude a pour objectif principal une meilleure comprehension des origines de la mr negative de part et d'autre de la transition. Pour gaas metallique, l'expression generale de la magnetoconductivite (mc) positive comporte trois termes issus de la localisation faible et des interactions electron-electron. Divers parametres, dont la constante de diffusion inelastique, sont ajustes et compares aux theories existantes. Afin de determiner l'importance reelle de chacune des contributions a la mc, nous les avons calculees separement. Nous constatons que le terme d'interaction electron-electron due a l'effet zeeman est negligeable dans ce materiau sauf aux temperatures les plus basses. Dans inp isolant, seuls les modeles utilisant les interferences electroniques sur des chemins directs de percolation decrivent assez correctement la mr negative. D'autres theories montrent que le signe negatif de la mr provient de l'augmentation de la longueur de localisation avec le champ magnetique.
Book Synopsis Mécanismes de conduction à basse température et magnétorésistance négative dans CdAs2 isolant by : Abdelkrim Oubraham
Download or read book Mécanismes de conduction à basse température et magnétorésistance négative dans CdAs2 isolant written by Abdelkrim Oubraham and published by . This book was released on 1991 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les travaux présentés sont relatifs à l'étude des mécanismes de conduction et de la magnétorésistance négative dans un semiconducteur II-V; CdAs2. Des mesures de résistivité et d'effet Hall ont été effectuées dans le domaine de température 290 K-1,6 K, à des champs magnétiques atteignant 1,5 Tesla. Le critère de Mott situe nos échantillons du côté isolant de la transition métal-isolant. Les deux premiers chapitres sont consacrés respectivement à la présentation des modèles théoriques décrivant les divers mécanismes de transport et à la description du dispositif expérimental utilisé. Un troisième chapitre aborde l'étude détaillée des énergies d'activation associées aux différents processus de conduction observés sur les courbes de variation de la résistivité avec la température. Un calcul variationnel de l'énergie d'ionisation des atomes donneurs dans CdAs2 est présenté. Le dernier chapitre de ce mémoire est consacré à l'étude de la magnétorésistance négative dans un régime de conduction par saut à distance variable. L'interprétation de ce phénomène nous a conduit à expérimenter plusieurs modèles théoriques. La confrontation de nos résultats expérimentaux aux modèles traitant la diffusion par une ou plusieurs impuretés ne nous a pas permis d'expliquer la magnétorésistance négative. Seule la théorie prenant en compte l'action du champ magnétique sur le front de mobilité et sur la longueur de localisation présente un excellent accord avec l'expérience
Book Synopsis CONTRIBUTION A L'ETUDE DE LA TRANSITION METAL-ISOLANT DANS LE DIOXYDE DE VANADIUM PAR RESONANCE PARAMAGNETIQUE ELECTRONIQUE EN ONDES MILLIMETRIQUES by : J.. MAGARINO
Download or read book CONTRIBUTION A L'ETUDE DE LA TRANSITION METAL-ISOLANT DANS LE DIOXYDE DE VANADIUM PAR RESONANCE PARAMAGNETIQUE ELECTRONIQUE EN ONDES MILLIMETRIQUES written by J.. MAGARINO and published by . This book was released on 1975 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: MISE EN EVIDENCE, PAR RESONANCE PARAMAGNETIQUE ELECTRONIQUE A HAUTE FREQUENCE ET A BASSE TEMPERATURE, DE L'EXISTENCE D'IONS V**(3+) LOCALISES DANS VO::(2) DOPE NIOBIUM ET DE L'EXISTENCE D'UNE INTERACTION COVALENTE AVEC LES OXYGENES VOISINS
Book Synopsis II-VI Semiconductor Materials and their Applications by : MariaC. Tamargo
Download or read book II-VI Semiconductor Materials and their Applications written by MariaC. Tamargo and published by Routledge. This book was released on 2018-05-04 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: II-VI Semiconductor Materials and Their Applications deals with II-VI compound semiconductors and the status of the two areas of current optoelectronics applications: blue-green emitters and IR detectors. Specifically, the growth, charactrtization, materials and device issues for these two applications are described. Emphasis is placed on the wide bandgap emitters where much progress has occurred recently.The book also presents new directions that have potential, future applications in optoelectronics for II-VI materials. In particular, it discusses the status of dilute magnetic semiconductors for mango-optical and electromagnetic devices, nonlinear optical properties, photorefractive effects and new materials and physics phenomena, such as self-organized, low-dimensional structures.II_VI Semiconductor Materials and Their Applications is a valuable reference book for researchers in the field as well as a textbook for materials science and applied physics courses.
Download or read book ZnO Thin Films written by Paolo Mele and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.
Download or read book Yvain written by Chretien de Troyes and published by Yale University Press. This book was released on 1987-09-10 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: A twelfth-century poem by the creator of the Arthurian romance describes the courageous exploits and triumphs of a brave lord who tries to win back his deserted wife's love
Book Synopsis Strongly Coupled Plasma Physics by : Forrest J. Rogers
Download or read book Strongly Coupled Plasma Physics written by Forrest J. Rogers and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: A NATO Advanced Research Workshop on Strongly Coupled Plasma Physics was held on the Santa Cruz Campus of the University of California, from August 4 through August 9, 1986. It was attended by 80 participants from 13 countries, 45 of whom were invited speakers. The present volume contains the texts of the invited talks and many of the contributed papers. The relative length of each text is roughly proportional to the length of the workshop presentation. The aim of the workshop was to bring together leading researchers from a number of related disciplines in which strong Coulomb interactions play a dominant role. Compared to the 1977 meeting in Orleans-la-Source, France and the 1982 meeting in Les-Houches, France, it is apparent that the field of strongly coupled plasmas has expanded greatly and has become a very significant field of physics with a wide range of applications. This workshop had a far greater participation of experimental researchers than did the previous two, and some confrontations of real experiments with theoretical calculations occurred. In the two earlier meetings the theoretical presentations were dominated by numerical simulations of static and dynamic properties of various strongly coupled plasmas. The dearth of experiments in the 1970's is now replaced by some very good experimental efforts.
Book Synopsis Properties of Gallium Arsenide by : M. R. Brozel
Download or read book Properties of Gallium Arsenide written by M. R. Brozel and published by Inst of Engineering & Technology. This book was released on 1996 with total page 981 pages. Available in PDF, EPUB and Kindle. Book excerpt: It was in 1986 that INSPEC (The Information Division of the Institution of Electrical Engineers) published the book Properties of Gallium Arsenide. Since then, major developments have taken place. This third edition is comprised of 150 specially commissioned articles contributed by experts from the USA, Europe and Japan.
Book Synopsis The Hubbard Model by : Dionys Baeriswyl
Download or read book The Hubbard Model written by Dionys Baeriswyl and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the slightly more than thirty years since its formulation, the Hubbard model has become a central component of modern many-body physics. It provides a paradigm for strongly correlated, interacting electronic systems and offers insights not only into the general underlying mathematical structure of many-body systems but also into the experimental behavior of many novel electronic materials. In condensed matter physics, the Hubbard model represents the simplest theoret ical framework for describing interacting electrons in a crystal lattice. Containing only two explicit parameters - the ratio ("Ujt") between the Coulomb repulsion and the kinetic energy of the electrons, and the filling (p) of the available electronic band - and one implicit parameter - the structure of the underlying lattice - it appears nonetheless capable of capturing behavior ranging from metallic to insulating and from magnetism to superconductivity. Introduced originally as a model of magnetism of transition met als, the Hubbard model has seen a spectacular recent renaissance in connection with possible applications to high-Tc superconductivity, for which particular emphasis has been placed on the phase diagram of the two-dimensional variant of the model. In mathematical physics, the Hubbard model has also had an essential role. The solution by Lieb and Wu of the one-dimensional Hubbard model by Bethe Ansatz provided the stimulus for a broad and continuing effort to study "solvable" many-body models. In higher dimensions, there have been important but isolated exact results (e. g. , N agoaka's Theorem).
Book Synopsis Graphite Intercalation Compounds II by : Hartmut Zabel
Download or read book Graphite Intercalation Compounds II written by Hartmut Zabel and published by Springer Science & Business Media. This book was released on 2013-03-07 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research on graphite intercalation compounds often acts as a forerunner for research in other sciences. For instance, the concept of staging, which is fundamental to graphite intercalation compounds, is also relevant to surface science in connection with adsorbates on metal surfaces and to high-temperature superconducting oxide layer materials. Phonon-folding and mode-splitting effects are not only basic to graphite intercalation compounds but also to polytypical systems such as supercon ductors, superlattices, and metal and semiconductor superlattices. Charge transfer effects playa tremendously important role in many areas, and they can be most easily and fundamentally studied with intercalated graphite. This list could be augmented with many more examples. The important message, however, is that graphite inter calation compounds represent a class of materials that not only can be used for testing a variety of condensed-matter concepts, but also stimulates new ideas and approaches. This volume is the second of a two-volume set. The first volume addressed the structural and dynamical aspects of graphite intercalation compounds, together with the chemistry and intercalation of new compounds. This second volume provides an up-to-date status report from expert researchers on the transport, magnetic, elec tronic and optical properties ofthis unique class of materials. The band-structure cal culations of the various donor and acceptor compounds are discussed in depth, and detailed reviews are provided ofthe experimental verification ofthe electronic struc ture in terms of their photoemission spectra and optical properties.
Book Synopsis Physical Properties of Amorphous Materials by : David Adler
Download or read book Physical Properties of Amorphous Materials written by David Adler and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
Download or read book DX Centers written by Elias Munoz Merino and published by Trans Tech Publications Ltd. This book was released on 1994-02-02 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the last 25 years, the behavior of donors in III-V alloys has been the subject of a very extensive research effort. The research emphasis on AlGaAs compounds is motivated by the industrial importance of AlGaAs/GaAs heterojunction based devices. As seeing it now, "the DX center problem", the behavior of donors in III-V alloys, has shown to be unexpectedly difficult to understand. To determine the microscopic nature of the DX center is still a challenging problem.
Download or read book Quantum Networks written by Günter Mahler and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum Networks is focused on density matrix theory cast into a product operator representation, particularly adapted to describing networks of finite state subsystems. This approach is important for understanding non-classical aspects such as single subsystem and multi-subsystem entanglement. An intuitive picture evolves of how these features are generated and destroyed by interactions with the environment. This second edition has been revised and enlarged. For better clarity the text has been partly reorganized and figures and formulae are presented in a more attractive way.
Book Synopsis Charles Pettigrew, First Bishop-elect of the North Carolina Episcopal Church by : Bennett H Wall
Download or read book Charles Pettigrew, First Bishop-elect of the North Carolina Episcopal Church written by Bennett H Wall and published by Hassell Street Press. This book was released on 2021-09-10 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer. This book was released on 1976 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.
Book Synopsis Hot Carriers in Semiconductors by : Karl Hess
Download or read book Hot Carriers in Semiconductors written by Karl Hess and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 575 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains invited and contributed papers of the Ninth International Conference on Hot Carriers in Semiconductors (HCIS-9), held July 3 I-August 4, 1995 in Chicago, Illinois. In all, the conference featured 15 invited oral presentations, 60 contributed oral presentations, and 105 poster presentations, and an international contingent of 170 scientists. As in recent conferences, the main themes of the conference were related to nonlinear transport in semiconductor heterojunctions and included Bloch oscillations, laser diode structures, and femtosecond spectroscopy. Interesting questions related to nonlinear transport, size quantization, and intersubband scattering were addressed that are relevant to the new quantum cascade laser. Many lectures were geared toward quantum wires and dots and toward nanostructures and mesoscopic systems in general. It is expected that such research will open new horizons to nonlinear transport studies. An attempt was made by the program committee to increase the number of presen tations related directly to devices. The richness of nonlocal hot electron effects that were discussed as a result, in our opinion, suggests that future conferences should further encourage reports on such device research. On behalf of the Program and International Advisory Committees, we thank the participants, who made the conference a successful and pleasant experience, and the support of the Army Research Office, the Office of Naval Research, and the Beckman Institute of the University of Illinois at Urbana-Champaign. We are also indebted to Mrs. Sara Starkey and Mrs.
Book Synopsis Unoccupied Electronic States by : J. C. Fuggle
Download or read book Unoccupied Electronic States written by J. C. Fuggle and published by Springer Verlag. This book was released on 1992 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt:
