Possible mechanisms of electronic phase separation in oxide interfaces

Abstract

LaAlO3/SrTiO3 ad LaTiO3/SrTiO3 interfaces are known to host a strongly inhomogeneous (nearly) two-dimensional electron gas (2DEG). In this work we present three unconventional electronic mechanisms of electronic phase separation (EPS) in a 2DEG as a possible source of inhomogeneity in oxide interfaces. Common to all three mechanisms is the dependence of some (interaction) potential on the 2DEG's density. We first consider a mechanism resulting from a sizable density-dependent Rashba spin-orbit coupling. Next, we point out that an EPS may also occur in the case of a density-dependent superconducting pairing interaction. Finally, we show that the confinement of the 2DEG to the interface by a density-dependent, self-consistent electrostatic potential can by itself cause an EPS.

arXiv comment4 pages and 4 figures, Proceedings of the International Conference "Superstripes 2014", 25-31 July 2015, Erice, Italy

References in corpus (11)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• 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
• Two-dimensional superconductivity at a Mott-Insulator/Band-Insulator interface: LaTiO3/SrTiO3
• Locally enhanced conductivity due to the tetragonal domain structure in LaAlO${}_3$/SrTiO${}_3$ heterointerfaces
• Intrinsic instability of electronic interfaces with strong Rashba coupling
• Effective medium theory for superconducting layers: A systematic analysis including space correlation effects
• Multi-band superconductivity and nanoscale inhomogeneity at oxide interfaces
• Equilibrium spin currents in the Rashba medium
• Evidence for charge-vortex duality at the LaAlO${}_3$/SrTiO${}_3$ interface
• Phase diagrams of voltage-gated oxide interfaces with strong Rashba coupling

Cited by in corpus (7)

• Electronic phase separation at LaAlO3/SrTiO3 interfaces tunable by oxygen deficiency
• Negative electronic compressibility and nanoscale inhomogeneity in ionic-liquid gated two-dimensional superconductors
• Helical currents in metallic Rashba strips
• Superstripes in the Low Energy Physics of Complex Quantum Matter at the Mesoscale
• Interplay between density and superconducting quantum critical fluctuations
• Longitudinal optical and spin-Hall conductivities of Rashba conducting strips coupled to ferro- and antiferromagnetic layers
• Transport properties of Rashba conducting strips coupled to magnetic moments with spiral order