Giant negative magnetoresistance driven by spin-orbit coupling at the LAO/STO interface

Abstract

The LAO/STO interface hosts a two-dimensional electron system that is unusually sensitive to the application of an in-plane magnetic field. Low-temperature experiments have revealed a giant negative magnetoresistance (dropping by 70\%), attributed to a magnetic-field induced transition between interacting phases of conduction electrons with Kondo-screened magnetic impurities. Here we report on experiments over a broad temperature range, showing the persistence of the magnetoresistance up to the 20~K range --- indicative of a single-particle mechanism. Motivated by a striking correspondence between the temperature and carrier density dependence of our magnetoresistance measurements we propose an alternative explanation. Working in the framework of semiclassical Boltzmann transport theory we demonstrate that the combination of spin-orbit coupling and scattering from finite-range impurities can explain the observed magnitude of the negative magnetoresistance, as well as the temperature and electron density dependence.

arXiv commentnew updates from feedback and review process. main text: improved discussion of the mechanisms of the MR; a discussion of a rescaling of the MR with a characteristic field B*(n). supplemental: theoretical estimate of the "sweet spot" density and window; effect of an out-of-plane B-field component on the MR; discussion of spin-orbit corrections to Boltzmann transport. 6+4 pages, 4+4 figures

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• Magnetoresistance of compensated semimetals in confined geometries
• Side gate tunable Josephson junctions at the LaAlO${}_3$/SrTiO${}_3$ interface
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• Nonmonotonic magnetoresistance of a two-dimensional viscous electron-hole fluid in a confined geometry
• Variational principle for quantum impurity systems in and out of equilibrium: application to Kondo problems
• Generalization of Bloch's theorem for arbitrary boundary conditions: Interfaces and topological surface band structure
• The quantum metric of electrons with spin-momentum locking
• High field magneto-transport in two-dimensional electron gas LaAlO3/SrTiO3
• Interfacial Rashba magnetoresistance of two-dimensional electron gas at LaAlO${}_3$/SrTiO${}_3$ interface
• Correlation between Superconductivity, Band Filling and Electron Confinement at the LaAlO${}_3$-SrTiO${}_3$ Interface
• Rashba interaction and local magnetic moments in a graphene-Boron Nitride heterostructure by intercalation with Au
• Semiclassical theory of anisotropic transport at LaAlO3/SrTiO3 interfaces under in-plane magnetic field
• Magnetic and nematic orders of the 2DEG at oxide (111) surfaces and interfaces
• Multiband Quantum Criticality of Polar Metals
• Superconducting dome in the LaAlO${}_3$/SrTiO${}_3$ interfaces as a direct effect of the extended s-wave symmetry of the gap
• Electronic subbands in the a-LaAlO${}_3$/KTaO${}_3$ interface revealed by quantum oscillations in high magnetic fields
• The mechanism of spin-orbit coupling in a 2D oxide interface
• Theoretical models of Rashba spin splitting in asymmetric SrTiO3-based heterostructures
• Anisotropic electronic transport of the two-dimensional electron system in Al2O3/SrTiO3 heterostructures
• Ferromagnetism and spin-dependent transport at a complex oxide interface
• Van Hove scenario of anisotropic transport in a two-dimensional spin-orbit coupled electron gas in an in-plane magnetic field
• Bimodal Phase Diagram of the Superfluid Density in LaAlO3/SrTiO3 Revealed by an Interfacial Waveguide Resonator
• Interplay between singlet and triplet pairings in multi-band two-dimensional oxide superconductors
• Dynamic Modulation of the Transport Properties of the LaAlO3/SrTiO3 Interface Using Uniaxial Strain
• Enhancing triplet superconductivity by the proximity to a singlet superconductor in oxide heterostructures
• Enhancement of electron mobility at oxide interfaces induced by WO3 overlayers
• Anisotropic Magnetoresistance in Multiband Systems: 2DEGs and Polar Metals at Oxide Interfaces
• Generalized Design Principles for Hydrodynamic Electron Transport in Anisotropic Metals
• Electric dipole spin resonance in single and two electron quantum dot defined in two-dimensional electron gas at the SrTiO${}_3$/LaAlO${}_3$ interface
• Correlation-Induced Band Competition in SrTiO3/LaAlO3
• Inhomogeneous superconductivity and quasilinear magnetoresistance at amorphous LaTiO3/SrTiO3 interfaces
• Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces
• Anisotropic electronic transport and Rashba effect of the two-dimensional electron system in (110) SrTiO${}_3$-based heterostructures
• Superconducting dome in doped 2D superconductors with broken inversion symmetry
• Spin-Hall Current and Nonlocal Transport in Ferromagnet-Free Multi-band models for SrTiO3-Based Nanodevices in the presence of impurities
• Fluctuations superconductivity and giant negative magnetoresistance in a gate voltage tuned 2D electron liquid with strong spin-orbit impurity scattering
• Large positive magnetoconductance in carbon nanoscrolls