Anisotropic electronic transport of the two-dimensional electron system in Al2O3/SrTiO3 heterostructures

Abstract

Transport measurements on the two dimensional electron system in Al2O3 SrTiO3 heterostructures indicate significant noncrystalline anisotropic behavior below T = 30 K. Lattice dislocations in SrTiO3 and interfacial steps are suggested to be the main sources for electronic anisotropy. Anisotropic defect scattering likewise alters magnetoresistance at low temperature remarkably and influences spin-orbit coupling significantly by the Elliot Yafet mechanism of spin relaxation resulting in anisotropic weak localization. Applying a magnetic field parallel to the interface results in an additional field induced anisotropy of the conductance, which can be attributed to Rashba spin orbit interaction. Compared to LaAlO3 SrTiO3, Rashba coupling seems to be reduced indicating a weaker polarity in Al2O3 SrTiO3 heterostructures.

References in corpus (23)

• Magnetic effects at the interface between nonmagnetic oxides
• Tunable Rashba spin-orbit interaction at oxide interfaces
• 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
• Metallic and insulating interfaces of amorphous SrTiO3-based oxide heterostructures
• A Universal Critical Density Underlying the Physics of Electrons at the LaAlO3/SrTiO3 Interface
• Locally enhanced conductivity due to the tetragonal domain structure in LaAlO${}_3$/SrTiO${}_3$ heterointerfaces
• Common Fermi-liquid origin of T-squared resistivity and superconductivity in n-type SrTiO3
• Local Electrostatic Imaging of Striped Domain Order in LaAlO3/SrTiO3
• Towards two-dimensional metallic behavior at LaAlO3/SrTiO3 interfaces
• Carrier freeze-out induced metal-insulator transition in oxygen deficient SrTiO3 films
• A Gate-tunable Polarized Phase of Two-Dimensional Electrons at the LaAlO3/SrTiO3 Interface
• Electric Field Tuning of the Rashba Effect in the Polar Perovskite Structures
• Rashba induced magnetoconductance oscillations in the LaAlO3-SrTiO3 heterostructure
• Origin and Transport Signatures of Spin-Orbit Interactions in One- and Two-Dimensional SrTiO${}_3$-Based Heterostructures
• Giant negative magnetoresistance driven by spin-orbit coupling at the LAO/STO interface
• Intrinsic instability of electronic interfaces with strong Rashba coupling
• Gate Tunable In- and Out-Of-Plane Spin-Orbit Coupling and Spin Splitting Anisotropy at LaAlO3/SrTiO3 (110) Interface
• Spin-orbit induced anisotropy in the magnetoconductance of two-dimensional metals
• Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures
• Proposal of a one-dimensional electron gas in the steps at the LaAlO${}_3$-SrTiO${}_3$ interface
• Thermally activated recovery of electrical conductivity in LaAlO3/SrTiO3
• Top-seeded solution growth of SrTiO3 crystals and phase diagram studies in the SrO-TiO2 system

Cited by in corpus (7)

• Magnetic-field-driven topological transitions in non-centrally-symmetric energy spectrum of 2D electron gas with Rashba-Dresselhaus spin-orbit interaction
• Van Hove scenario of anisotropic transport in a two-dimensional spin-orbit coupled electron gas in an in-plane magnetic field
• Controlling the electronic interface properties of AlO${}_x$/SrTiO${}_3$ heterostructures
• A Laser-ARPES View of the 2D Electron Systems at LaAlO3/SrTiO3 and Al/SrTiO3 Interfaces
• High-mobility two-dimensional electron gas in $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$ heterostructures
• Influence of the vicinal substrate miscut on the anisotropic two-dimensional electronic transport in Al2O3-SrTiO3 heterostructures
• Anisotropic electronic transport and Rashba effect of the two-dimensional electron system in (110) SrTiO${}_3$-based heterostructures