![]() Different self-consistent assignments of the unit cell are presented, allowing the polar discontinuity picture to be recast in terms of an equivalent local charge neutrality picture. In close relation to the analysis of the stability of polar surfaces and semiconductor heterointerfaces, the variation of the dipole moment across a heterointerface plays a key role in determining its stability. In this context, here we present basic electrostatic features that arise in oxide heterostructures which vary the ionic charge stacking sequence. ![]() Therefore the aspiration to arbitrarily mix and match perovskite components requires a basic understanding of, and ultimately control over, these issues. Specific research directions included: probing the microscopic behavior of epitaxial interfaces and buried layers novel materials structures that emerge from ionic and electronic reconfiguration at epitaxial interfaces ultrahigh-resolution mapping of the atomic structure of heterointerfaces using synchrotron-based x-ray surface scattering, including direct methods of phase retrieval using ultrafast lasers to study the effects of transient strain on coherent manipulation of multi-ferroic order parameters and investigating structural ordering and relaxation processes in = to the insulating parent compounds. The findings also contributed towards an important technological goal which was to achieve a better basic understanding of structural and electronic correlations so that the unusual properties of complex oxides can be exploited for energy-critical applications. The results contributed fundamentally to one of the currently most active frontiers in condensed matter physics research, namely to better understand the intricate relationship between charge, lattice, orbital and spin degrees of freedom that are exhibited by complex oxide heterostructures. The overall goals of this program were focused on the behavior of epitaxial oxide heterostructures at atomic length scales (Ångstroms), and correspondingly short time-scales (fs -ns). This Final Report describes the scientific accomplishments that have been achieved with support from grant DE-FG02-06ER46273 during the period –.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |