First-principles Calculations in Real-space Formalism

First-principles Calculations in Real-space Formalism
Author: Kikuji Hirose
Publisher: World Scientific
Total Pages: 266
Release: 2005
Genre: Science
ISBN: 1860945120

With cutting-edge materials and minute electronic devices being produced by the latest nanoscale fabrication technology, it is essential for scientists and engineers to rely on first-principles (ab initio) calculation methods to fully understand the electronic configurations and transport properties of nanostructures. It is now imperative to introduce practical and tractable calculation methods that accurately describe the physics in nanostructures suspended between electrodes.This timely volume addresses novel methods for calculating electronic transport properties using real-space formalisms free from geometrical restrictions. The book comprises two parts: The first details the basic formalism of the real-space finite-difference method and its applications. This provides the theoretical foundation for the second part of the book, which presents the methods for calculating the properties of electronic transport through nanostructures sandwiched by semi-infinite electrodes.

Electronic Structure Calculations on Graphics Processing Units

Electronic Structure Calculations on Graphics Processing Units
Author: Ross C. Walker
Publisher: John Wiley & Sons
Total Pages: 372
Release: 2016-04-18
Genre: Science
ISBN: 1118661788

Electronic Structure Calculations on Graphics Processing Units: From Quantum Chemistry to Condensed Matter Physics provides an overview of computing on graphics processing units (GPUs), a brief introduction to GPU programming, and the latest examples of code developments and applications for the most widely used electronic structure methods. The book covers all commonly used basis sets including localized Gaussian and Slater type basis functions, plane waves, wavelets and real-space grid-based approaches. The chapters expose details on the calculation of two-electron integrals, exchange-correlation quadrature, Fock matrix formation, solution of the self-consistent field equations, calculation of nuclear gradients to obtain forces, and methods to treat excited states within DFT. Other chapters focus on semiempirical and correlated wave function methods including density fitted second order Møller-Plesset perturbation theory and both iterative and perturbative single- and multireference coupled cluster methods. Electronic Structure Calculations on Graphics Processing Units: From Quantum Chemistry to Condensed Matter Physics presents an accessible overview of the field for graduate students and senior researchers of theoretical and computational chemistry, condensed matter physics and materials science, as well as software developers looking for an entry point into the realm of GPU and hybrid GPU/CPU programming for electronic structure calculations.

X-Ray Absorption Fine Structure -- XAFS13

X-Ray Absorption Fine Structure -- XAFS13
Author: Britt Hedman
Publisher: American Institute of Physics
Total Pages: 968
Release: 2007-03-09
Genre: Science
ISBN: 9780735403840

The scope of this Conference was X-ray Absorption Fine Structure (XAFS) and related techniques and topics using synchrotron radiation. Many techniques and theories focusing on XAFS-related phenomena are presented. These techniques are used in many scientific areas to study electronic and real space structure of a multitude of materials.