Dual-Gate Modulation of Carrier Density and Disorder in an Oxide Two-Dimensional Electron System

Abstract

Carrier density and disorder are two crucial parameters that control the properties of correlated two-dimensional electron systems. In order to disentangle their individual contributions to quantum phenomena, independent tuning of these two parameters is required. Here, by utilizing a hybrid liquid/solid electric dual-gate geometry acting on the conducting LaAlO3/SrTiO3 heterointerface, we obtain an additional degree of freedom to strongly modify the electron confinement profile and thus the strength of interfacial scattering, independent from the carrier density. A dual-gate controlled nonlinear Hall effect is a direct manifestation of this profile, which can be quantitatively understood by a Poisson-Schrodinger subband model. In particular, the large nonlinear dielectric response of SrTiO3 enables a very wide range of tunable density and disorder, far beyond that for conventional semiconductors. Our study provides a broad framework for understanding various reported phenomena at the LaAlO3/SrTiO3 interface.

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Cited by in corpus (19)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Electric field control of disorder-tunable superconductivity and the emergence of quantum metal at an oxide interface
• The density and disorder tuned superconductor-metal transition in two dimensions
• Tunable superconductivity at the oxide-insulator/KTaO${}_3$ interface and its origin
• Oxygen Electromigration and Energy Band Reconstruction Induced by Electrolyte Field Effect at Oxide Interfaces
• Gate-tunable Rashba spin-orbit coupling and spin polarization at diluted oxide interfaces
• Half-metallicity in honeycomb-kagome-lattice Mg3C2 monolayer with carrier doping
• Universal behavior of the bosonic metallic ground state in a two-dimensional superconductor
• Correlation between Superconductivity, Band Filling and Electron Confinement at the LaAlO${}_3$-SrTiO${}_3$ Interface
• Quantized critical supercurrent in SrTiO${}_3$-based quantum point contacts
• Superconducting tunneling spectroscopy of spin-orbit coupling and orbital depairing in Nb:SrTiO${}_3$
• Magnetism, transport, and thermodynamics in two-dimensional half-filled Hubbard superlattices
• Strain Engineering of the Intrinsic Spin Hall Conductivity in a SrTiO${}_3$ Quantum Well
• Strain-controlled Insulator-Metal Transition in YTiO3/SrTiO3 Superlattices: A First-Principles Study
• 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
• Universally enhanced superconductivity and coexisting ferroelectricity at oxide interfaces
• Two-dimensional metallic ferroelectricity in PbTe monolayer by electrostatic doping
• Coupling between tilts and charge carriers at polar-nonpolar perovskite interfaces