Type
Text
Type
Dissertation
Advisor
Wei Ku. | Philip Allen | Axel Drees | Mark S. Hybertsen.
Date
2011-08-01
Keywords
Physics
Department
Department of Physics
Language
en_US
Source
This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree.
Identifier
http://hdl.handle.net/11401/71562
Publisher
The Graduate School, Stony Brook University: Stony Brook, NY.
Format
application/pdf
Abstract
Doping is one of the most powerful tools for tuning the electronic properties of functional materials. Well known examples include doped semiconductors and the Cu and Fe based high temperature superconductors. Besides introducing charge carriers and chemical pressure, it is almost inevitable that dopants will introduce quenched disorder into the system. This can have a wide range of consequences for the electronic structure, such as electric and thermal resistance, a deformation of the nodal structure of a superconductor or Anderson localization. In this thesis the influence of disordered dopants is studied by calculating the configuration-averaged spectral function from first principles within the super cell approximation. To overcome two major problems of the super cell approximation, the band folding and the computational expense, two Wannier function based first principles techniques are developed. The developed methodology is applied to address three realistic materials problems. The first problem is on the influence of disorder on the Fermi surface of NaxCoO2, an important thermoelectric material. The second problem is on the role of oxygen vacancies in the room temperature ferromagnetism in the recently discovered dilute magnetic semiconductor Cu:ZnO. The third problem is on the carrier doping and charge localization in transition metal doped iron based superconductors.
Recommended Citation
Berlijn, Tom, "Effects of Disordered Dopants on the Electronic Structure of Functional Materials: Wannier Function-Based First Principles Methods for Disordered Systems" (2011). Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions). 767.
https://commons.library.stonybrook.edu/stony-brook-theses-and-dissertations-collection/767