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2011 | OriginalPaper | Chapter

2. Theoretical Methods and Approximations

Author : Weronika Walkosz

Published in: Atomic Scale Characterization and First-Principles Studies of Si₃N₄ Interfaces

Publisher: Springer New York

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Abstract

This chapter describes the theoretical approaches and approximations used in standard first principles calculations. First, the Born Oppenheimer approximation is stated. Next, an overview of the basic formulation of density functional theory (DFT) is given, underlying its merits in describing various materials and their properties, but also pointing out the aspects which need further improvements. The Kohn–Sham ansatz, which provides a means of calculating properties of many-body system using independent-particle methods, is presented along with practical schemes for solving the resulting Kohn–Sham equations. Finally, the DFT+U method and its implementation within a pseudopotential-plane wave framework are introduced.

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Metadata
Title
Theoretical Methods and Approximations
Author
Weronika Walkosz
Copyright Year
2011
Publisher
Springer New York
DOI
https://doi.org/10.1007/978-1-4419-7817-2_2

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