Numerical Study of the Nonequilibrium Dynamics of 1-D Electron-phonon Systems Using a Local Basis Optimization
Author: Christoph Brockt
Publisher:
Published: 2018
Total Pages:
ISBN-13:
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Author: Christoph Brockt
Publisher:
Published: 2018
Total Pages:
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DOWNLOAD EBOOKAuthor: Jan Felix Stolpp
Publisher:
Published: 2021
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKIn this thesis, different wave-function based numerical methods are used to study many-body systems with bosonic degrees of freedom in 1d. The main focus is on the Holstein model of spinless fermions, where ground-state phases, nonequilibrium dynamics, and thermalization are investigated. Using matrix-product-state methods for the investigation of such models with electron-phonon coupling poses special numerical challenges. Local basis optimization, projected purification, and subspace expansion are used to overcome these challenges....
Author: David Jansen
Publisher:
Published: 2023
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKIn 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...
Author: Walter E. Bron
Publisher: Springer Science & Business Media
Published: 2013-11-11
Total Pages: 682
ISBN-13: 1461325013
DOWNLOAD EBOOKPhonons are always present in the solid state even at an absolute temperature of 0 K where zero point vibrations still abound. Moreover, phonons interact with all other excitations of the solid state and, thereby, influence most of its properties. Historically experimental information on phonon transport came from measurements of thermal conductivity. Over the past two decades much more, and much more detailed, information on phonon transport and on many of the inherent phonon interaction processes have come to light from experiments which use nonequilibrium phonons to study their dynamics. The resultant research field has most recently blossomed with the development of ever more sophisticated experimental and theoretical methods which can be applied to it. In fact, the field is moving so rapidly that new members of the research community have difficulties in keeping up to date. This NATO Advanced Study Institute (ASI) was organized with the objective of overcoming the information barrier between those expert in the field and those who are new to it. Thus it was decided to (i) organize a set of tutorially based lectures covering most of the important facets in the field, and (ii) to produce an Institute proceedings which would serve both as the first general textbook, as well as a valuable reference book, for this field of knowledge.
Author: Lawrence John Challis
Publisher:
Published: 2003
Total Pages: 302
ISBN-13: 9780198507321
DOWNLOAD EBOOKThe study of electrons and holes confined to two, one and even zero dimensions has uncovered a rich variety of new physics and applications. This book describes the interaction between these confined carriers and the optic and acoustic phonons within and around the confined regions. Phonons provide the principal channel of energy transfer between the carriers and their surroundings and also the main restriction to their room temperature mobility. But they have many other roles; they provide, for example, an essential feature of the operation of the quantum cascade laser. Since their momenta at relevant energies are well matched to those of electrons, they can also be used to probe electronic properties such as the confinement width of 2D electron gases and the dispersion curve of quasiparticles in the fractional quantum Hall effect. The book describes both the physics of the electron-phonon interaction in the different confined systems and the experimental and theoretical techniques that have been used in its investigation. The experimental methods include optical and transport techniques as well as techniques in which phonons are used as the experimental probe. The aim of the book is to provide an up to date review of the physics and its significance in device performance. It is also written to be explanatory and accessible to graduate students and others new to the field.
Author: Wolfgang Eisenmenger
Publisher: North Holland
Published: 1986
Total Pages: 788
ISBN-13:
DOWNLOAD EBOOKAuthor: Michael Lewis Williams
Publisher:
Published: 1985
Total Pages: 222
ISBN-13:
DOWNLOAD EBOOKAuthor: Xiaodong Wang
Publisher: Springer Science & Business Media
Published: 2013-11-18
Total Pages: 520
ISBN-13: 3319020129
DOWNLOAD EBOOKFor the efficient utilization of energy resources and the minimization of environmental damage, thermoelectric materials can play an important role by converting waste heat into electricity directly. Nanostructured thermoelectric materials have received much attention recently due to the potential for enhanced properties associated with size effects and quantum confinement. Nanoscale Thermoelectrics describes the theory underlying these phenomena, as well as various thermoelectric materials and nanostructures such as carbon nanotubes, SiGe nanowires, and graphene nanoribbons. Chapters written by leading scientists throughout the world are intended to create a fundamental bridge between thermoelectrics and nanotechnology, and to stimulate readers' interest in developing new types of thermoelectric materials and devices for power generation and other applications. Nanoscale Thermoelectrics is both a comprehensive introduction to the field and a guide to further research, and can be recommended for Physics, Electrical Engineering, and Materials Science departments.
Author: Walter E. Bron
Publisher:
Published:
Total Pages: 679
ISBN-13:
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Published: 1995
Total Pages: 488
ISBN-13:
DOWNLOAD EBOOKLists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.