Optical Absorption Spectra Calculated Using Linear-Scaling Density-Functional Theory

• Κύριος συγγραφέας: Ratcliff, Laura (Συγγραφέας)
• Συγγραφή απο Οργανισμό/Αρχή: SpringerLink (Online service)
• Μορφή: Ηλεκτρονική πηγή Ηλ. βιβλίο
• Γλώσσα: English
• Έκδοση: Heidelberg : Springer International Publishing : Imprint: Springer, 2013.
• Σειρά: Springer Theses, Recognizing Outstanding Ph.D. Research,
• Θέματα: Physics.; Atomic structure.; Molecular structure.; Spectra.; Solid state physics.; Optics.; Optoelectronics.; Plasmons (Physics).; Atomic/Molecular Structure and Spectra.; Solid State Physics.; Optics, Optoelectronics, Plasmonics and Optical Devices.

 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. 

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