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Author: Albert Rose
Publisher: World Scientific
ISBN: 9789971506353
Category : Science
Languages : en
Pages : 200
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Book Description
This monograph is a radical departure from the conventional quantum mechanical approach to electron-phonon interactions. It translates the customary quantum mechanical analysis of the electron-phonon interactions carried out in Fourier space into a predominantly classical analysis carried out in real space. Various electron-phonon interactions such as the polar and nonpolar optical phonons, acoustic phonons that interact via deformation potential and via the piezoelectric effect and phonons in metals, are treated in this monograph by a single, relatively simple ?classical? model. This model is shown to apply to electron interactions with the deep lying X-ray levels of atoms, with plasmons and with Cerenkov radiation. The unifying concept that applies to all of these phenomena is a new definition of a coupling constant. The essentially classical interaction of an electron with its surrounding is clearly brought out to be the cause of spontaneous emission of phonons. The same concept also applies to the case of spontaneous emission of photons. While the bulk of this monograph deals with quanta of phonons and quanta of photons, a discussion of the acousto electric effect which is a purely classical phenomenon is presented. The newly defined coupling constant turns out to be valid too for this discussion. This universality of the coupling constant goes far beyond. It is equally applicable to amorphous materials. This significant application gives an analytic formulation of mobility in amorphous materials.
Author: Albert Rose
Publisher: World Scientific
ISBN: 9789971506353
Category : Science
Languages : en
Pages : 200
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Book Description
This monograph is a radical departure from the conventional quantum mechanical approach to electron-phonon interactions. It translates the customary quantum mechanical analysis of the electron-phonon interactions carried out in Fourier space into a predominantly classical analysis carried out in real space. Various electron-phonon interactions such as the polar and nonpolar optical phonons, acoustic phonons that interact via deformation potential and via the piezoelectric effect and phonons in metals, are treated in this monograph by a single, relatively simple ?classical? model. This model is shown to apply to electron interactions with the deep lying X-ray levels of atoms, with plasmons and with Cerenkov radiation. The unifying concept that applies to all of these phenomena is a new definition of a coupling constant. The essentially classical interaction of an electron with its surrounding is clearly brought out to be the cause of spontaneous emission of phonons. The same concept also applies to the case of spontaneous emission of photons. While the bulk of this monograph deals with quanta of phonons and quanta of photons, a discussion of the acousto electric effect which is a purely classical phenomenon is presented. The newly defined coupling constant turns out to be valid too for this discussion. This universality of the coupling constant goes far beyond. It is equally applicable to amorphous materials. This significant application gives an analytic formulation of mobility in amorphous materials.
Author: A.V. Khotkevich
Publisher: Springer Science & Business Media
ISBN: 146152265X
Category : Science
Languages : en
Pages : 162
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Book Description
The characteristics of electrical contacts have long attracted the attention of researchers since these contacts are used in every electrical and electronic device. Earlier studies generally considered electrical contacts of large dimensions, having regions of current concentration with diameters substantially larger than the characteristic dimensions of the material: the interatomic distance, the mean free path for electrons, the coherence length in the superconducting state, etc. [110]. The development of microelectronics presented to scientists and engineers the task of studying the characteristics of electrical contacts with ultra-small dimensions. Characteristics of point contacts such as mechanical stability under continuous current loads, the magnitudes of electrical fluctuations, inherent sensitivity in radio devices and nonlinear characteristics in connection with electromagnetic radiation can not be understood and altered in the required way without knowledge of the physical processes occurring in contacts. Until recently it was thought that the electrical conductivity of contacts with direct conductance (without tunneling or semiconducting barriers) obeyed Ohm's law. Nonlinearities of the current-voltage characteristics were explained by joule heating of the metal in the region of the contact. However, studies of the current-voltage characteristics of metallic point contacts at low (liquid helium) temperatures [142] showed that heating effects were negligible in many cases and the nonlinear characteristics under these conditions were observed to take the form of the energy dependent probability of inelastic electron scattering, induced by various mechanisms.
Author: H. Haken
Publisher: Springer Science & Business Media
ISBN: 3642860036
Category : Science
Languages : en
Pages : 472
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Book Description
The study of cooperative phenomena is one of the dominant features of contem porary physics. Outside physics it has grown to a huge field of interdisciplinary investigation, involving all the natural sciences from physics via biology to socio logy. Yet, during the first few decades following the advent of quantum theory, the pursuit of the single particle or the single atom, as the case may be, has been so fascinating that only a small number of physicists have stressed the importance of collective behaviour. One outstanding personality among these few is Professor HERBERT FROHLICH. He has made an enormous contribution to the modern concept of cooperativity and has stimulated a whole generation of physicists. Therefore, it seemed to the editors very appropriate to dedicate a volume on "cooperative phenomena" to him on the occasion of his official retirement from his university duties. Nevertheless, in the course of carrying out this project, the editors have been somewhat amazed to find that they have covered the essentials of contemporary physics and its im pact on other scientific disciplines. It thus becomes clear how much HERBERT FROHLICH has inspired research workers and has acted as a stimulating discussion partner for others. FROHLICH is one of those exceptional scientists who have wor ked in quite different fields and given them an enormous impetus. Unfortunately, the number of scientists of such distinctive personality has been decreasing in our century.
Author: J.M. Ziman
Publisher: Oxford University Press
ISBN: 9780198507796
Category : Science
Languages : en
Pages : 572
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Book Description
This is a classic text of its time in condensed matter physics.
Author: David Emin
Publisher: Cambridge University Press
ISBN: 0521519063
Category : Science
Languages : en
Pages : 231
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Book Description
A distinctive introduction to the principles governing polaron science for experimental and theoretical graduate students and researchers.
Author: G. Grimvall
Publisher: Elsevier
ISBN: 0080542867
Category : Technology & Engineering
Languages : en
Pages : 445
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Book Description
This is a thoroughly revised version of the original book published in 1986. About half of the contents of the previous version remain essentially unchanged, and one quarter has been rewritten and updated. The rest consists of completely new and extended material. Recent research has focussed on new materials made through "molecular engineering", and computational materials science through ab initio electron structure calculations. Another trend is the ever growing interdisciplinary aspect of both basic and applied materials science. There is an obvious need for reviews that link well established results to the modern approaches. One purpose of this book is to provide such an overview in a specific field of materials science, namely thermophysical phenomena that are intimately connected with the lattice vibrations of solids. This includes, e.g., elastic properties and electrical and thermal transport. Furthermore, this book attempts to present the results in such a form that the reader can clearly see their domain of applicability, for instance if and how they depend on crystal structure, defects, applied pressure, crystal anisotropy etc. The level and presentation is such that the results can be immediately used in research. Graduate students in condensed matter physics, metallurgy, inorganic chemistry or geophysical materials will benefit from this book as will theoretical physicists and scientists in industrial research laboratories.
Author: Jai Singh
Publisher: Springer Science & Business Media
ISBN: 1489909966
Category : Science
Languages : en
Pages : 276
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Book Description
Applying a unified quantum approach, contributors offer fresh insights into the theoretical developments in the excitation energy transfer processes in condensed matter. This comprehensive volume examines Frenkel and Wannier excitonic processes; rates of excitonic processes; theory of laser sputter and polymer ablation; and polarons, excitonic polarons and self-trapping.
Author: Han Zhang
Publisher:
ISBN: 9813271140
Category : Electron-phonon interactions
Languages : en
Pages : 358
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Book Description
Electron-Lattice Interaction and Its Impact on High Tc Superconductivity / V.Z. Kresin and S.A. Wolf -- Through a Lattice Darkly: Shedding Light on Electron-Phonon Coupling in the High Tc Cuprates / D.R.Garcia and A. Lanzara -- Electron-Phonon Coupling Effects Explored by Inelastic Neutron Scattering / L. Pintschovius -- Phonon Nomalies and Dynamic Stripes / D. Reznik -- Oxygen Isotope Effect in Cuprates Results from Polaron-induced Superconductivity / S. Weyeneth and K.A. Müller -- Oxygen Isotope Effect on the Effective Mass of Carriers from Magnetic Measurements on La2-xSrxCuO4 / G.M. Zhao, K.K. Singh, A.P.B. Sinha, and D.E. Morris -- Isotope Effects and Possible Pairing Mechanism in Optimally Doped Cuprate Superconductors / G.M. Zhao, V. Kirtikar, and D.E. Morris -- Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates / H. Iwasawa, J.F. Douglas, K. Sato, T. Masui, Y. Yoshida, Z. Sun, H. Eisaki, H. Bando, A. Ino, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, S. Tajima, S. Uchida, T. Saitoh, D.S. Dessau, and Y. Aiura -- Kink Structure in the Electronic Dispersion of High-Tc Superconductors From the Electron-Phonon Interaction / S. Koikegami and Y. Aiura -- Theory of High-Temperature Superconductivity in Doped Polar Insulators / A.S. Alexandrov -- High-Temperature Superconductivity: The Explanation / A.S. Alexandrov -- Polaronic Effect and Its Impact on Tc for Novel Layered Superconducting Systems / V. Z. Kresin -- Fine Structure in the Tunneling Spectra of Electron-Doped Cuprates: No Coupling to the Magnetic Resonance Mode / G.M. Zhao -- Identification of the Bulk Pairing Symmetry in High-Temperature Superconductors: Evidence for an Extended S Wave with Eight Line Nodes / G.M. Zhao -- Block Model and Origin of Strong Anisotropy in High Tc Superconductors / H. Zhang.
Author: Giuseppe Nicosia
Publisher: Springer Nature
ISBN: 3030441016
Category : Mathematics
Languages : en
Pages : 288
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Book Description
This collection of selected papers presented at the 12th International Conference on Scientific Computing in Electrical Engineering, SCEE 2018, held in Taormina, Sicily, Italy, in September 2018, showcases the state of the art in SCEE. The aim of the SCEE 2018 conference was to bring together scientists from academia and industry, mathematicians, electrical engineers, computer scientists, and physicists, and to promote intensive discussions on industrially relevant mathematical problems, with an emphasis on the modeling and numerical simulation of electronic circuits and of electromagnetic fields. This extensive reference work is divided into five parts: Computational Electromagnetics, Device Modeling and Simulation, Circuit Simulation, Mathematical and Computational Methods, Model Order Reduction. Each part starts with a general introduction, followed by the respective contributions. The book will appeal to mathematicians and electrical engineers. Further, it introduces algorithm and program developers to recent advances in the other fields, while industry experts will be introduced to new programming tools and mathematical methods.
Author: T.J. Wieting
Publisher: Springer Science & Business Media
ISBN: 9400993706
Category : Science
Languages : en
Pages : 483
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Book Description
This volume is devoted to the electron and phonon energy states of inorganic layered crystals. The distinctive feature of these low-dimensional materials is their easy mechanical cleavage along planes parallel to the layers. This feature implies that the chemical binding within each layer is much stronger than the binding between layers and that some, but not necessarily all, physical properties of layered crystals have two-dimensional character. In Wyckoff's Crystal Structures, SiC and related com pounds are regarded as layered structures, because their atomic layers are alternately stacked according to the requirements of cubic and hexagonal close-packing. How ever, the uniform (tetrahedral) coordination of the atoms in these compounds excludes the kind of structural anisotropy that is fundamental to the materials dis cussed in this volume. An individual layer of a layered crystal may be composed of either a single sheet of atoms, as in graphite, or a set of up to five atomic sheets, as in Bi2 Te3' A layer may also have more complicated arrangements of the atoms, as we find for example in Sb S . But the unique feature common to all these materials is 2 3 the structural anisotropy, which directly affects their electronic and vibrational properties. The nature of the weak interlayer coupling is not very well understood, despite the frequent attribution of the coupling in the literature to van der Waals forces. Two main facts, however, have emerged from all studies.
