Strong correlations elucidate the electronic structure and phase-diagram of LaAlO3/SrTiO3 interface

Abstract

The interface between the two band insulators SrTiO3 and LaAlO3 unexpectedly has the properties of a two dimensional electron gas. It is even superconducting with a transition temperature, Tc, that can be tuned using gate bias Vg, which controls the number of electrons added or removed from the interface. The gate bias - temperature (Vg, T) phase diagram is characterized by a dome-shaped region where superconductivity occurs, i.e., Tc has a non-monotonic dependence on Vg, similar to many unconventional superconductors. In this communication the frequency of the quantum resistance-oscillations versus inverse magnetic field is reported for various Vg. This frequency follows the same nonmonotonic behavior as Tc; similar trend is seen in the low field limit of the Hall coefficient. We theoretically show that electronic correlations result in a non-monotonic population of the mobile band, which can account for the experimental behavior of the normal transport properties and the superconducting dome.

Nature Communications 2015

References in corpus (5)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Critical doping for the onset of a two-band superconducting ground state in SrTiO${}_{3-\delta }$
• Fermi surface of the most dilute superconductor
• Giant negative magnetoresistance driven by spin-orbit coupling at the LAO/STO interface
• Anomalous magnetic ground state in LaAlO3/SrTiO3 interface probed by transport through nanowires

Cited by in corpus (39)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
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• Nonreciprocal current in noncentrosymmetric Rashba superconductors
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• Gate-tunable band structure of the LaAlO${}_3$-SrTiO${}_3$ interface
• Link between the Superconducting Dome and Spin-Orbit Interaction in the (111) LaAlO${}_3$/SrTiO${}_3$ Interface
• Giant tunability of the two-dimensional electron gas at the interface of gamma-Al2O3/SrTiO3
• Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures
• Competition between electron pairing and phase coherence in superconducting interfaces
• Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO${}_3$/SrTiO${}_3$ interface
• Anisotropic, multi-carrier transport at the (111) LaAlO${}_3$/SrTiO${}_3$ interface
• Symmetry and correlation effects on band structure explain the anomalous transport properties of (111) LaAlO${}_3$/SrTiO${}_3$
• Tunneling into a quantum confinement created by a single-step nano-lithography of conducting oxide interfaces
• Ferroelectric Exchange Bias Affects Interfacial Electronic States
• Correlation between Superconductivity, Band Filling and Electron Confinement at the LaAlO${}_3$-SrTiO${}_3$ Interface
• Semiclassical theory of anisotropic transport at LaAlO3/SrTiO3 interfaces under in-plane magnetic field
• Superconducting dome in the LaAlO${}_3$/SrTiO${}_3$ interfaces as a direct effect of the extended s-wave symmetry of the gap
• Superconductivity in 2D electron gas induced by high energy optical phonon mode and large polarization of the STO substrate
• Experimental Evidence of t2g Electron-Gas Rashba Interaction Induced by Asymmetric Orbital Hybridization
• Interplay between singlet and triplet pairings in multi-band two-dimensional oxide superconductors
• Bimodal Phase Diagram of the Superfluid Density in LaAlO3/SrTiO3 Revealed by an Interfacial Waveguide Resonator
• Superconducting dome with $extended$ $s$-$wave$ pairing symmetry in the heavily hole-overdoped copper-oxide planes
• Vortex excitations in the Insulating State of an Oxide Interface
• Possible Flexoelectric Origin of the Lifshitz Transition in LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Artificial quantum confinement in LAO3/STO heterostructure
• Precision measurements of the AC field dependence of the superconducting transition in strontium titanate
• Interplay between the extended s-wave symmetry of the gap and the spin-orbit coupling in the low-electron concentration regime of quasi-two-dimensional superconductors
• A local maximum in the superconducting transition temperature of Nb-doped strontium titanate under uniaxial compressive stress
• Quantum Hall effect in a CVD-grown oxide
• Electric dipole spin resonance in single and two electron quantum dot defined in two-dimensional electron gas at the SrTiO${}_3$/LaAlO${}_3$ interface
• Enhanced Non-linear Response by Manipulating the Dirac Point in the (111) LaTiO${}_3$/SrTiO${}_3$ Interface
• Correlation-Induced Band Competition in SrTiO3/LaAlO3
• Solution Monolayer Epitaxy for Tunable Atomically Sharp Oxide Interfaces
• Coexistence of high electron-mobility, unpaired spins, and superconductivity at high carrier density SrTiO${}_3$-based interfaces
• Evolution of domain structure with electron doping in ferroelectric thin films
• Resonance triplet dynamics in the quenched unitary Bose gas
• Superconducting dome in doped 2D superconductors with broken inversion symmetry
• Strain-engineered interaction of quantum polar and superconducting phases
• Origin of the dome-shaped superconducting phase diagram in ${\mathrm{SrTiO}}_3$-based interfaces