Theory of d₀ perovskites and their heterostructures
| dc.contributor.advisor | MacDonald, Allan H. | |
| dc.creator | Khalsa, Guru Bahadur Singh | en |
| dc.date.accessioned | 2013-10-17T14:16:01Z | en |
| dc.date.accessioned | 2017-05-11T22:34:42Z | |
| dc.date.available | 2017-05-11T22:34:42Z | |
| dc.date.issued | 2013-08 | en |
| dc.date.submitted | August 2013 | en |
| dc.date.updated | 2013-10-17T14:16:02Z | en |
| dc.description | text | en |
| dc.description.abstract | The recent discovery of a two-dimensional electron (2DEG) gas at interfaces between nonpolar SrTiO₃ (STO) with other polar perovskites has lead to an enormous amount of research. Among this 2DEGs most interesting properties are two-dimensional superconductivity and ferromagnetism, sometimes concurrent. This study provides a starting point in understanding the reconstruction of bulk perovskite t₂[subscript g] bands near a surface or polar interface. First a symmetry constrained [k arrow] · [p arrow] model is developed for an arbitrary pseudocubic bulk perovskite. This [k arrow] · [p arrow] model is applied to studies of bulk STO under external strain and to the Shubnikov - de Haas effect in lightly doped STO to high magnetic fields. Then a simplified electronic structure model is developed for surfaces and interfaces. This model includes non-linear and non-local screening effects by a single polar lattice mode. Generalization of the lattice screening model is discussed. Bonding within a single perovskite layer is then investigated further to understand Rashba interactions and their connection with microscopic material parameters. Next the optical conductivity of quantum confined t₂[subscript g] bands is investigated. Finally some possible future work based on the ideas developed in this thesis are explained. | en |
| dc.description.department | Physics | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.uri | http://hdl.handle.net/2152/21599 | en |
| dc.language.iso | en_US | en |
| dc.subject | Perovskites | en |
| dc.subject | 2DEG | en |
| dc.subject | Quantum confinement | en |
| dc.title | Theory of d₀ perovskites and their heterostructures | en |