Aperiodic quantum oscillations in the two-dimensional electron gas at the LaAlO3/SrTiO3 interface

Abstract

Despite several attempts, the intimate electronic structure of two-dimensional electron systems buried at the interface between LaAlO3 and SrTiO3 still remains to be experimentally revealed. Here, we investigate the transport properties of a high-mobility quasi-two-dimensional electron gas at this interface under high magnetic field (55 T) and provide new insights for electronic band structure by analyzing the Shubnikov-de Haas oscillations. Interestingly, the quantum oscillations are not 1/B-periodic and produce a highly non-linear Landau plot (Landau level index versus 1/B). Among possible scenarios, the Roth-Gao-Niu equation provides a natural explanation for 1/B-aperiodic oscillations in relation with the magnetic response functions of the system. Overall, the magneto-transport data are discussed in light of high-resolution scanning transmission electron microscopy analysis of the interface as well as calculations from density functional theory.

References in corpus (25)

• Magnetic effects at the interface between nonmagnetic oxides
• Quantum Transport in Semiconductor Nanostructures
• Tunable Rashba spin-orbit interaction at oxide interfaces
• 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
• The role of oxygen vacancies in SrTiO3 at the LaAlO3/SrTiO3 interface
• High Mobility in LaAlO3/SrTiO3 Heterostructures: Origin, Dimensionality and Perspectives
• Tuning spin-orbit coupling and superconductivity at the SrTiO3/LaAlO3 interface: a magneto-transport study
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Orbital reconstruction and two-dimensional electron gas at the LaAlO3/SrTiO3 interface
• A polarity-induced defect mechanism for conductivity and magnetism at polar-nonpolar oxide interfaces
• Two-dimensional quantum oscillations of the conductance at LaAlO3/SrTiO3 interfaces
• Locally enhanced conductivity due to the tetragonal domain structure in LaAlO${}_3$/SrTiO${}_3$ heterointerfaces
• Berry phase of non-ideal Dirac fermions in topological insulators
• Shubnikov-de Haas oscillations in SrTiO3\LaAlO3 interface
• Anomalously strong pinning of the filling factor nu=2 in epitaxial graphene
• Quantization of Hall Resistance at the Metallic Interface between an Oxide Insulator and SrTiO${}_3$
• Large modulation of the Shubnikov-de Haas oscillations by the Rashba interaction at the LaAlO${}_3$/SrTiO${}_3$ interface
• Magnetic Response Functions in Landau Levels
• k.p subband structure of the LaAlO3/SrTiO3 interface
• Landau levels, response functions and magnetic oscillations from a generalized Onsager relation
• Spin-Orbit Coupling in LaAlO${}_3$/SrTiO${}_3$ interfaces: Magnetism and Orbital Ordering
• Shubnikov-de Haas-like Quantum Oscillations in Artificial One-Dimensional LaAlO3/SrTiO3 Electron Channels
• High field magneto-transport in two-dimensional electron gas LaAlO3/SrTiO3
• Puddle-induced resistance oscillations in the breakdown of the graphene quantum Hall effect

Cited by in corpus (11)

• Electronic subbands in the a-LaAlO${}_3$/KTaO${}_3$ interface revealed by quantum oscillations in high magnetic fields
• Two-Dimensional Electron Gas with High Mobility Forming at BaO/SrTiO3 Interface
• Ionic modulation at the LaAlO${}_3$/KTaO${}_3$ interface for extreme high-mobility two-dimensional electron gas
• Quantum oscillations in 2D electron gases with spin-orbit and Zeeman interactions
• Quantum oscillations in an optically-illuminated two-dimensional electron system at the LaAlO${}_3$/SrTiO${}_3$ interface
• Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces
• BinPo: An open-source code to compute the band structure of two-dimensional electron systems
• Lithography-free patterning of SrTiO${}_3$-based two-dimensional electron gases using direct atomic layer processing
• Controlling Spin-Mixing Conductance in KTaO${}_3$ 2DEGs by Varying Argon-Ion Irradiation Time
• Electrostatic gate-controlled quantum interference in a high-mobility two-dimensional electron gas at the (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35}$)O${}_3$/SrTiO${}_3$ interface
• Anomalous Landau levels and quantum oscillation in rotation-invariant insulators