Theory of d₀ perovskites and their heterostructures

dc.contributor.advisorMacDonald, Allan H.
dc.creatorKhalsa, Guru Bahadur Singhen
dc.date.accessioned2013-10-17T14:16:01Zen
dc.date.issued2013-08en
dc.date.submittedAugust 2013en
dc.date.updated2013-10-17T14:16:02Zen
dc.descriptiontexten
dc.description.abstractThe 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.departmentPhysicsen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/2152/21599en
dc.language.isoen_USen
dc.subjectPerovskitesen
dc.subject2DEGen
dc.subjectQuantum confinementen
dc.titleTheory of d₀ perovskites and their heterostructuresen
thesis.degree.departmentPhysicsen
thesis.degree.disciplinePhysicsen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophyen

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