Understanding the role of exchange and correlations in complex oxides under strain and oxide heterostructures

Abstract

The study of complex oxides and oxide heterostructures have dominated the field of experimental and theoretical condensed matter research for the better part of the last few decades. Powerful experimental techniques like molecular beam epitaxy and pulsed laser deposition have made fabrication of oxide heterostructures with atomically sharp interfaces possible, while more and more sophisticated handling of exchange and correlations within first principles methods including density functional theory (DFT) supplemented with Hubbard U corrections and hybrid functionals, and beyond DFT techniques like dynamical mean field theory (DMFT) have made understanding of such correlated oxides and oxide interfaces easier. The emergence of the high mobility two dimensional electron gas with fascinating properties like giant photoconductance, large negative magnetoresistance, superconductivity, ferromagnetism, and the mysterious coexistence of the latter two have indeed caught the attention of condensed matter community at large. Similarly strain tuning of oxides have generated considerable interest particularly after the recent discovery of piezoelectric methods of strain generation. Theoretical understanding and prediction of the possible exotic phases emerging in such complex oxides both under strain and in heterostructures will eventually lead to better design of device applications in this new emerging field of oxide electronics, along with possible discovery of exotic physics in condensed matter systems which may be of wider significance! In this review we briefly look at theoretical studies of novel phenomena in oxides under strain and oxide heterostructures, and try to understand the role of exchange and particularly correlation in giving rise to such exotic electronic states.

References in corpus (25)

• Magnetic effects at the interface between nonmagnetic oxides
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
• Mapping the Spatial Distribution of Charge Carriers in LaAlO3/SrTiO3 Heterostructures
• Tuning spin-orbit coupling and superconductivity at the SrTiO3/LaAlO3 interface: a magneto-transport study
• Avoiding the polarization catastrophe in LaAlO3 overlayers on SrTiO3(001) through a polar distortion
• Two-dimensional quantum oscillations of the conductance at LaAlO3/SrTiO3 interfaces
• Electrostatic carrier doping of GdTiO3/SrTiO3 interfaces
• Electronic reconstruction at SrMnO3-LaMnO3 superlattice interfaces
• Metal insulator transitions in perovskite SrIrO3 thin films
• Nanoscale Phenomena in Oxide Heterostructures
• Carrier-controlled ferromagnetism in SrTiO3
• Electronic structure induced reconstruction and magnetic ordering at the LaAlO${}_3|$SrTiO${}_3$ interface
• Emergent nanoscale superparamagnetism at oxide interfaces
• Toward an artificial Mott insulator: Correlations in confined, high-density electron liquids in SrTiO3
• A First-Principles Study of the Electronic Reconstructions of LaAlO3/SrTiO3 Heterointerfaces and Their Variants
• Charge states and magnetic ordering in LaMnO3/SrTiO3 superlattices
• Dimer Mott Insulator in an Oxide Heterostructure
• Quantum oscillations from a two-dimensional electron gas at a Mott/band insulator interface
• Strain-induced tuning of the electronic Coulomb interaction in 3d transition metal oxide perovskites
• Electronic Structure of Oxide Interfaces: A Comparative Analysis of GdTiO${}_3$/SrTiO${}_3$ and LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Modulation doping to control the high-density electron gas at a polar/non-polar oxide interface
• Electronic and Magnetic State of LaMnO${}_3$ Epitaxially Strained on SrTiO${}_3$: Effect of Local Correlation and Non-local Exchange
• Emergence of a ferromagnetic insulating state in LaMnO${}_3$/SrTiO${}_3$ heterostructures: The role of strong electronic correlations and strain

Cited by in corpus (3)

• The importance of electronic correlations in exploring the exotic phase diagram of layered Li${}_x$MnO${}_2$
• Tuning Electronic and Optical Properties of 2D/3D Construction based on Hybrid Perovskites through Interfacial Charge Transfer: Towards Higher Efficiency Solar Cells
• Decoupling the effects of geometry and nature of strain in LaMnO${}_3$: Interplay of dynamic correlations and uniaxial strain driving magnetic phase transitions