The interfaces of oxide heterostructures provide a strong interplay between spin, orbital, charge and lattice degrees of freedom. Their careful tuning may lead to artificially designed materials with novel properties, opening the possibility to have new design concepts of future nanodevices. Specifically, the interfaces of transition metal oxide heterostructures may give rise to two-dimensional electron gas, charge transfer and charge migration along with complex magnetic phenomena, which can be useful for technological applications.
The structural reconstruction at the interfaces and the surfaces of the transition metal oxides can modify physical properties due to the breaking of the time reversal and/or inversion symmetry. Moreover, the two-dimensionality of the surface reduces the electrons' kinetic energies, thereby enhancing the effects of electron correlations, which can affect many important physical properties such as optical, transport, magnetic and superconductivity, to name a few. Therefore, it is widely recognized that the interfaces of oxide heterostructures present very interesting phenomena, which require fundamental understanding from both experimental and theoretical sides. We employ sophisticated ab initio theories to study electron correlation, transport and complex magnetic structures at these interfaces.