Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State

Abstract

Interfaces between complex oxides are emerging as one of the most interesting playgrounds in condensed matter physics. In this special setting, in which translational symmetry is artificially broken, a variety of novel electronic phases can be promoted. Theoretical studies predict complex phase diagrams and suggest the key role of the carrier density in determining the systems ground states. A particularly fascinating system is the interface between the insulators LaAlO${}_3$ and SrTiO${}_3$, which displays conductivity with high mobility. Recently two possible ground states have been experimentally identified: a magnetic state and a two dimensional (2D) superconducting condensate. In this Letter we use the electric field effect to explore the phase diagram of the system. The electrostatic tuning of the carrier density allows an on/off switching of superconductivity and drives a quantum phase transition (QPT) between a 2D superconducting state and an insulating state (2D-QSI). Analyses of the magnetotransport properties in the insulating state are consistent with weak localisation and do not provide evidence for magnetism. The electric field control of superconductivity demonstrated here opens the way to the development of novel mesoscopic superconducting circuits

11 pages, 4 figures

References in corpus (5)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Magnetic effects at the interface between nonmagnetic oxides
• High Mobility in LaAlO3/SrTiO3 Heterostructures: Origin, Dimensionality and Perspectives
• Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
• Electric field effect modulation of transition temperature, mobile carrier density and in-plane penetration depth in NdBa2Cu3O(7-delta) thin films

Cited by in corpus (34)

• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• High mobility conduction at (110) and (111) LaAlO3/SrTiO3 interfaces
• Fermi surface of the most dilute superconductor
• Polarity-induced oxygen vacancies at LaAlO3|SrTiO3 interfaces
• Oxide Heterostructures for Efficient Solar Cells
• Polar catastrophe and electronic reconstructions at the LaAlO3/SrTiO3 interface: evidence from optical second harmonic generation
• Rashba induced magnetoconductance oscillations in the LaAlO3-SrTiO3 heterostructure
• Structure and Correlation Effects in Semiconducting SrTiO${}_3$
• Intrinsic instability of electronic interfaces with strong Rashba coupling
• Giant Oscillating Thermopower at Oxide Interfaces
• First principle electronic, structural, elastic, and optical properties of strontium titanate
• Weak-localization and spin-orbit interaction in side-gate field effect devices at the LaAlO${}_3$/SrTiO${}_3$ interface
• Superconducting dome in MoS2 and TiSe2 generated by quasiparticle-phonon coupling
• Evidence for charge-vortex duality at the LaAlO${}_3$/SrTiO${}_3$ interface
• Growth-induced electron mobility enhancement at the LaAlO${}_3$/SrTiO${}_3$ interface
• Accumulation, inversion, and depletion layers in SrTiO${}_3$
• Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures
• Magneto-transport study of top- and back-gated LaAlO${}_3$/SrTiO${}_3$ heterostructures
• Anomalous Transport in Sketched Nanostructures at the LaAlO3/SrTiO3 Interface
• Spin-Orbit Coupling in LaAlO${}_3$/SrTiO${}_3$ interfaces: Magnetism and Orbital Ordering
• The Structural Analysis Possibilities of Reflection High Energy Electron Diffraction
• Diodes with Breakdown Voltages Enhanced by the Metal-Insulator Transition of LaAlO${}_3$-SrTiO${}_3$ Interfaces
• Berezinskii-Kosterlitz-Thouless Transition in Heavy Fermion Superlattices
• Superstripes and complexity in high-temperature superconductors
• Self-consistent iteration procedure in analyzing reflectivity and spectroscopic ellipsometry data of multilayered materials and their interfaces
• Thermally activated recovery of electrical conductivity in LaAlO3/SrTiO3
• Inhomogeneous multi-carrier superconductivity at LaXO3/SrTiO3 (X=Al or Ti) oxide interfaces
• Electric-field-induced pyroelectric order and localization of the confined electrons in LaAlO3/SrTiO3 heterostructures
• Interplay between sheet resistance increase and magnetotransport properties in $\mathrm{LaAl}{\mathrm{O}}_3/\mathrm{SrTi}{\mathrm{O}}_3$
• Anomalous magneto-transport at the superconducting interface between LaAlO3 and SrTiO3
• Possible mechanisms of electronic phase separation in oxide interfaces
• Mechanism of orbital reconstruction at the interfaces of transition metal oxides
• Field effect on surface states in a doped Mott-Insulator thin film
• Multiple Quantum Phase Transitions at the superconducting LaTiO3/SrTiO3 interface