Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures

Abstract

The interface between the two complex oxides LaAlO3 and SrTiO3 has remarkable properties that can be locally reconfigured between conducting and insulating states using a conductive atomic force microscope. Prior investigations of sketched quantum dot devices revealed a phase in which electrons form pairs, implying a strongly attractive electron-electron interaction. Here, we show that these devices with strong electron-electron interactions can exhibit a gate-tunable transition from a pair-tunneling regime to a single-electron (Andreev bound state) tunneling regime where the interactions become repulsive. The electron-electron interaction sign change is associated with a Lifshitz transition where the dxz and dyz bands start to become occupied. This electronically tunable electron-electron interaction, combined with the nanoscale reconfigurability of this system, provides an interesting starting point towards solid-state quantum simulation.

25 pages, 7 figures

References in corpus (9)

• Magnetic effects at the interface between nonmagnetic oxides
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• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Quantum Fluctuations in the Superfluid State of the BCS-BEC Crossover
• Critical Current 0-$\pi$ Transition in Designed Josephson Quantum Dot Junctions
• Fermi surface of the most dilute superconductor
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• Giant Oscillating Thermopower at Oxide Interfaces

Cited by in corpus (28)

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• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
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• Shubnikov-de Haas-like Quantum Oscillations in Artificial One-Dimensional LaAlO3/SrTiO3 Electron Channels
• Suppressed carrier density for the patterned high mobility two-dimensional electron gas at gamma-Al2O3/SrTiO3 heterointerfaces
• Revealing attractive electron-electron interaction in a quantum dot by full counting statistics
• Attractive and driven interaction in quantum dots: mechanisms for geometric pumping
• Emergent mode and bound states in single-component one-dimensional lattice fermionic systems
• Geometric energy transport and refrigeration with driven quantum dots
• Quantized critical supercurrent in SrTiO${}_3$-based quantum point contacts
• Interplay of the Kondo effect with the induced pairing in electronic and caloric properties of T-shaped double quantum dots
• Nonequilibrium Kondo effect by equilibrium numerical renormalization group method: The hybrid Anderson model subject to a finite spin bias
• Coexistence of $s$-wave superconductivity and phase separation in the half-filled extended Hubbard model with attractive interactions
• Role of electron-electron interaction in the Mpemba effect in quantum dots
• Possible Flexoelectric Origin of the Lifshitz Transition in LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Mesoscopic pairing without superconductivity
• Synthesis of epitaxial magnetic pyrochlore heterojunctions
• Spin-orbit-assisted electron pairing in 1D waveguides
• Modulation induced transport signatures in correlated electron waveguides
• Quantized Ballistic Transport of Electrons and Electron Pairs in LaAlO${}_3$/SrTiO${}_3$ Nanowires
• Electron-electron attraction in an engineered electromechanical system
• Solution of master equations by fermionic-duality: Time-dependent charge and heat currents through an interacting quantum dot proximized by a superconductor
• Josephson junction arrays as a platform for topological phases of matter
• Quantum phase transitions in superconductor--quantum-dot--superconductor Josephson structures with attractive intradot interaction
• A Milli-Kelvin Atomic Force Microscope Made of Glass
• Imaging GHz surface acoustic wave modes in electrostricted LaAlO${}_3$/SrTiO${}_3$ heterostructures
• Graphene-Complex-oxide Nanoscale Device Concepts
• Reconfigurable Oxide Nanoelectronics by Tip-induced Electron Delocalization