Friedhelm Bechstedt – författare
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5 produkter
5 produkter
Del 5 - Physical Research
Semiconductor Surfaces and Interfaces
Their Atomic and Electronic Structures
Inbunden, Tyska, 1989
2 107 kr
Skickas inom 5-8 vardagar
534 kr
Skickas inom 10-15 vardagar
This comprehensive and innovative text provides an understanding of the geometric and electronic structure of surfaces. It addresses the surfaces of covalent and ionic solids and also metals. The book emphasizes fundamental aspects, such as the principles of surface crystallography and thermodynamics, the forces driving the rearrangement of the atoms, and the relationship between bonding and electronic structure. The book illuminates the relationship between surface orientation, chemistry, energetics, and the resulting properties. The text includes a discussion of elementary excitations at surfaces, their description and measurement. The general physical arguments and methods presented in the book will also allow the reader to analyse novel surfaces and interfaces of new materials. This makes the book an indispensable reference to all those studying growth, surface-molecule interactions, self-assembled structures, property engineering and materials development.
587 kr
Skickas inom 10-15 vardagar
In recent decades, surface and interface physics has become an increasingly important subdiscipline within the physics of condensed matter as well as an interdisciplinary ?eld between physics, crystallography, chemistry, biology, and materials science. There are several driving forces for the development of the ?eld, among them semiconductor technology, new materials, epitaxy and chemical catalysis. The electrical and optical properties of nanostructures based on di?erent semiconductors are governed by the interfaces or, at least, by the presence of interfaces. A microscopic understanding of the growth processes requires the investigation of the surface processes at an atomic level. Elementary processes on surfaces, such as adsorption and desorption, play a key role in the understanding of heterogeneous catalysis. During the course of the surface investigations, it has been possible to observe a dramatic progress in the ability to study surfaces of materials in general, and on a microscopic scale in particular. There are two main reasons for this progress. From the experimental point of view it is largely due to the development and availability of new types of powerful microscopes. Sp- tacular advances in techniques such as scanning tunneling microscopy now allow us to observe individual atoms on surfaces, and to follow their paths with a clarity unimaginable a few years ago. From the theoretical point of view (or rather the viewpoint of simulation) progress is related to the wide availability of computers and the dramatic increase of their power.
Del 181 - Springer Series in Solid-State Sciences
Many-Body Approach to Electronic Excitations
Concepts and Applications
Inbunden, Engelska, 2014
2 326 kr
Skickas inom 10-15 vardagar
Central approximations as Hedin's GW and the T-matrix approximation are discussed.(iv) The fourth part is focused on response functions measured in optical and loss spectroscopies and neutral pair or collective excitations.
Del 181 - Springer Series in Solid-State Sciences
Many-Body Approach to Electronic Excitations
Concepts and Applications
Häftad, Engelska, 2016
2 326 kr
Skickas inom 10-15 vardagar
The many-body-theoretical basis and applications of theoretical spectroscopy of condensed matter, e.g. crystals, nanosystems, and molecules are unified in one advanced text for readers from graduate students to active researchers in the field. The theory is developed from first principles including fully the electron-electron interaction and spin interactions. It is based on the many-body perturbation theory, a quantum-field-theoretical description, and Green's functions. The important expressions for ground states as well as electronic single-particle and pair excitations are explained. Based on single-particle and two-particle Green's functions, the Dyson and Bethe-Salpeter equations are derived. They are applied to calculate spectral and response functions. Important spectra are those which can be measured using photoemission/inverse photoemission, optical spectroscopy, and electron energy loss/inelastic X-ray spectroscopy. Important approximations are derived and discussed in the light of selected computational and experimental results. Some numerical implementations available in well-known computer codes are critically discussed. The book is divided into four parts: (i) In the first part the many-electron systems are described in the framework of the quantum-field theory. The electron spin and the spin-orbit interaction are taken into account. Sum rules are derived. (ii) The second part is mainly related to the ground state of electronic systems. The total energy is treated within the density functional theory. The most important approximations for exchange and correlation are delighted. (iii) The third part is essentially devoted to the description of charged electronic excitations such as electrons and holes. Central approximations as Hedin's GW and the T-matrix approximation are discussed.(iv) The fourth part is focused on response functions measured in optical and loss spectroscopies and neutral pair or collective excitations.