Optical absorption spectra calculated using linear-scaling density-functional theory Laura Ratcliff

Format:

Book

Thesis/Dissertation

Author/Creator:

Ratcliff, Laura

Series:

Springer theses

Springer theses 2190-5053

Language:

English

Subjects (All):

Density functionals.

Light absorption--Mathematical models.

Light absorption.

Materials--Optical properties--Data processing.

Materials.

Genre:

theses

dissertations

Academic theses

Physical Description:

1 online resource

Place of Publication:

Cham New York Springer ©2013

Language Note:

English

Summary:

The development of linear-scaling density functional theory (LS-DFT) has made ab initio calculations on systems containing thousands of atoms possible. These systems range from nanostructures to biomolecules. These methods rely on the use of localized basis sets, which are optimised for the representation of occupied Kohn-Sham states but do not guarantee an accurate representation of the unoccupied states. This is problematic if one wishes to combine the power of LS-DFT with that of theoretical spectroscopy, which provides a direct link between simulation and experiment. In this work a new method is presented for optimizing localized functions to accurately represent the unoccupied states, thus allowing theoretical spectroscopy of large systems. Results are presented for optical absorption spectra calculated using the ONETEP code, but the method is equally applicable to other spectroscopies and LS formulations. Other topics covered include a study of some simple one dimensional basis sets and the presentation of two methods for band structure calculation using localized basis sets, both of which have important implications for the use of localized basis sets within LS-DFT

Contents:

Introduction Density-Functional Theory Linear-Scaling Methods Theoretical Spectroscopy Basis Sets and Band Structures Conduction States: Methods and Applications Results and Discussion Conclusion

Notes:

Ph. D. Imperial College London

Includes bibliographical references

ISBN:

9783319003399

3319003399

OCLC:

843891110

Access Restriction:

Restricted for use by site license