Transport In Phonon Systems
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Transport In Phonon Systems
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Author : Vadim Lʹvovich Gurevich
language : en
Publisher: North Holland
Release Date : 1986
Transport In Phonon Systems written by Vadim Lʹvovich Gurevich and has been published by North Holland this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Science categories.
In Transport in Phonon Systems'' the principles of physical kinetics are given and the description of transport properties in a wide class of macroscopic physical systems - the phonon systems - is presented. Important problems of phonon transport such as thermal conductivity and thermal waves of second sound, dielectric losses, sound propagation and absorption, phonon echo, and phonon transport in superfluid helium II are discussed. Many of these problems are discussed for the first time and the author presents numerous original results. Not only specialists but also those wishing to enter the field of phonon physics and phonon kinetics can benefit from Transport in Phonon Systems''.
Cooling And Heat Transport In Low Dimensional Phonon Systems Superconductors And Silicon
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Author : Juha Muhonen
language : en
Publisher:
Release Date : 2012
Cooling And Heat Transport In Low Dimensional Phonon Systems Superconductors And Silicon written by Juha Muhonen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
An Efficient Solution Procedure For Simulating Phonon Transport In Multiscale Multimaterial Systems
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Author : James Madigan Loy
language : en
Publisher:
Release Date : 2013
An Efficient Solution Procedure For Simulating Phonon Transport In Multiscale Multimaterial Systems written by James Madigan Loy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Over the last two decades, advanced fabrication techniques have enabled the fabrication of materials and devices at sub-micron length scales. For heat conduction, the conventional Fourier model for predicting energy transport has been shown to yield erroneous results on such length scales. In semiconductors and dielectrics, energy transport occurs through phonons, which are quanta of lattice vibrations. When phase coherence effects can be ignored, phonon transport may be modeled using the semi-classical phonon Boltzmann transport equation (BTE). The objective of this thesis is to develop an efficient computational method to solve the BTE, both for single-material and multi-material systems, where transport across heterogeneous interfaces is expected to play a critical role. The resulting solver will find application in the design of microelectronic circuits and thermoelectric devices. The primary source of computational difficulties in solving the phonon BTE lies in the scattering term, which redistributes phonon energies in wave-vector space. In its complete form, the scattering term is non-linear, and is non-zero only when energy and momentum conservation rules are satisfied. To reduce complexity, scattering interactions are often approximated by the single mode relaxation time (SMRT) approximation, which couples different phonon groups to each other through a thermal bath at the equilibrium temperature. The most common methods for solving the BTE in the SMRT approximation employ sequential solution techniques which solve for the spatial distribution of the phonon energy of each phonon group one after another. Coupling between phonons is treated explicitly and updated after all phonon groups have been solved individually. When the domain length is small compared to the phonon mean free path, corresponding to a high Knudsen number ([mathematical equation]), this sequential procedure works well. At low Knudsen number, however, this procedure suffers long convergence times because the coupling between phonon groups is very strong for an explicit treatment of coupling to suffice. In problems of practical interest, such as silicon-based microelectronics, for example, phonon groups have a very large spread in mean free paths, resulting in a combination of high and low Knudsen number; in these problems, it is virtually impossible to obtain solutions using sequential solution techniques. In this thesis, a new computational procedure for solving the non-gray phonon BTE under the SMRT approximation is developed. This procedure, called the coupled ordinates method (COMET), is shown to achieve significant solution acceleration over the sequential solution technique for a wide range of Knudsen numbers. Its success lies in treating phonon-phonon coupling implicitly through a direct solution of all equations in wave vector space at a particular spatial location. To increase coupling in the spatial domain, this procedure is embedded as a relaxation sweep in a geometric multigrid. Due to the heavy computational load at each spatial location, COMET exhibits excellent scaling on parallel platforms using domain decomposition. On serial platforms, COMET is shown to achieve accelerations of 60 times over the sequential procedure for Kn
Energy Transport In Low Dimensional Systems
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Author : Anant Raj
language : en
Publisher:
Release Date : 2017
Energy Transport In Low Dimensional Systems written by Anant Raj and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Full Counting Statistics Of Phonon Thermal Transport For Disordered Systems
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Author : 張超
language : en
Publisher:
Release Date : 2019
Full Counting Statistics Of Phonon Thermal Transport For Disordered Systems written by 張超 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Green's functions categories.
Electrical Transport In Nanoscale Systems
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Author : Massimiliano Di Ventra
language : en
Publisher: Cambridge University Press
Release Date : 2008-08-07
Electrical Transport In Nanoscale Systems written by Massimiliano Di Ventra and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-08-07 with Science categories.
In recent years there has been a huge increase in the research and development of nanoscale science and technology. Central to the understanding of the properties of nanoscale structures is the modeling of electronic conduction through these systems. This graduate textbook provides an in-depth description of the transport phenomena relevant to systems of nanoscale dimensions. In this textbook the different theoretical approaches are critically discussed, with emphasis on their basic assumptions and approximations. The book also covers information content in the measurement of currents, the role of initial conditions in establishing a steady state, and the modern use of density-functional theory. Topics are introduced by simple physical arguments, with particular attention to the non-equilibrium statistical nature of electrical conduction, and followed by a detailed formal derivation. This textbook is ideal for graduate students in physics, chemistry, and electrical engineering.
Length Scale Dependent Phonon Interactions
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Author : Subhash L. Shinde
language : en
Publisher:
Release Date : 2013-11-30
Length Scale Dependent Phonon Interactions written by Subhash L. Shinde and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-30 with categories.
Quantum Transport And Dynamics Of Phonons In Mesoscopic Systems
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Author : Deborah Hannah Santamore
language : en
Publisher:
Release Date : 2003
Quantum Transport And Dynamics Of Phonons In Mesoscopic Systems written by Deborah Hannah Santamore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Electronic dissertations categories.
Phonons In Semiconductor Nanostructures
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Author : J.P. Leburton
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Phonons In Semiconductor Nanostructures written by J.P. Leburton and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
In the last ten years, the physics and technology of low dimensional structures has experienced a tremendous development. Quantum structures with vertical and lateral confinements are now routinely fabricated with feature sizes below 100 run. While quantization of the electron states in mesoscopic systems has been the subject of intense investigation, the effect of confinement on lattice vibrations and its influence on the electron-phonon interaction and energy dissipation in nanostructures received atten tion only recently. This NATO Advanced Research Workshop on Phonons in Sem iconductor Nanostructures was a forum for discussion on the latest developments in the physics of phonons and their impact on the electronic properties of low-dimensional structures. Our goal was to bring together specialists in lattice dynamics and nanos tructure physics to assess the increasing importance of phonon effects on the physical properties of one-(lD) and zero-dimensional (OD) structures. The Workshop addressed various issues related to phonon physics in III-V, II-VI and IV semiconductor nanostructures. The following topics were successively covered: Models for confined phonons in semiconductor nanostructures, latest experimental observations of confined phonons and electron-phonon interaction in two-dimensional systems, elementary excitations in nanostructures, phonons and optical processes in reduced dimensionality systems, phonon limited transport phenomena, hot electron effects in quasi - ID structures, carrier relaxation and phonon bottleneck in quantum dots.
Transport And Dynamical Properties Of Electron Phonon Coupled Systems
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Author : David Jansen
language : en
Publisher:
Release Date : 2023
Transport And Dynamical Properties Of Electron Phonon Coupled Systems written by David Jansen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
In this thesis, I investigate the transport and dynamical properties of electron-phonon coupled systems using numerical methods. I focus on the one-dimensional Holstein model, which incorporates both polaron and charge density wave (CDW) physics, and use matrix-product-state-based algorithms. In the first part, I present work where we combine purification with local basis optimization to study the finite-temperature properties of the model. This gives access to polaron spectral functions, polaron and bipolaron optical conductivity, and the energy-transport coefficient at finite filling. The...