A5053219958- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Magnetic and transport properties of perovskites and related materials
- Ferroelectric and Negative Capacitance Devices
- Quantum and electron transport phenomena
- Diamond and Carbon-based Materials Research
- Physics of Superconductivity and Magnetism
- Atomic and Subatomic Physics Research
- Advanced Materials Characterization Techniques
- Cold Atom Physics and Bose-Einstein Condensates
- Molecular Junctions and Nanostructures
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Gyrotron and Vacuum Electronics Research
- Advanced Memory and Neural Computing
- Magnetic properties of thin films
- Topological Materials and Phenomena
- Surface and Thin Film Phenomena
- Advanced X-ray and CT Imaging
- Acoustic Wave Resonator Technologies
- Magnetic confinement fusion research
- Catalysis and Oxidation Reactions
- Advancements in Solid Oxide Fuel Cells
- Liquid Crystal Research Advancements
- Rare-earth and actinide compounds
University of Pittsburgh
2013-2020
Pittsburgh Quantum Institute
2016-2020
SrTiO3-based heterointerfaces support quasi-two-dimensional (2D) electron systems that are analogous to III–V semiconductor heterostructures, but also possess superconducting, magnetic, spintronic, ferroelectric, and ferroelastic degrees of freedom. Despite these rich properties, the relatively low mobilities 2D complex-oxide interfaces appear preclude ballistic transport in 1D. Here we show LaAlO3/SrTiO3 interface can quantized electrons (nonsuperconducting) pairs within quasi-1D structures...
An unusual conductance sequence Effects of correlations between electrons are enhanced in systems reduced dimensions. The two-dimensional interface two oxide materials, lanthanum aluminate (LaAlO 3 ) and strontium titanate (SrTiO ), exhibits magnetism superconductivity. In even lower-dimensional fabricated similar heterostructures, can pair without going superconducting. Briggeman et al. have now observed another exotic effect LaAlO /SrTiO waveguides: At certain magnetic fields, the these...
We examine superconductivity in ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ channels with widths that transition from the 1D to 2D regime. The superconducting critical current is independent of channel width and increases approximately linearly number parallel channels. Signatures electron pairing outside regime are also found be width. Collectively, these results indicate exists at boundary absent within interior region intrinsic nature interface imposes strong physical constraints on...
High-mobility complex-oxide heterostructures and nanostructures offer new opportunities for extending the paradigm of quantum transport beyond realm traditional III-V or carbon-based materials. Recent investigations with LaAlO3/SrTiO3-based dots reveal existence a strongly correlated phase in which electrons form spin-singlet pairs without becoming superconducting. Here, we report evidence micrometer-scale ballistic electron quasi-1D LaAlO3/SrTiO3 nanowire cavities. In paired phase,...
The interface between the two complex oxides LaAlO3 and SrTiO3 has remarkable properties that can be locally reconfigured conducting insulating states using a conductive atomic force microscope. Prior investigations of sketched quantum dot devices revealed phase in which electrons form pairs, implying strongly attractive electron-electron interaction. Here, we show these with strong interactions exhibit gate-tunable transition from pair-tunneling regime to single-electron (Andreev bound...
Effects from nonequilibrium superconductivity play a major role in the physics of superconducting nanoelectronics. Notably, charge imbalance arising point at which device contacts normal-metal leads is prevalent, particularly reduced dimensions. We investigate nonlocal transport signatures quasi-1D nanostructures formed LaAlO3/SrTiO3 interface. The resistances correlate with bias, magnetic field, and back gate dependence state. attribute these to or spin-dependent excitations. Understanding...
SrTiO$_3$-based heterointerfaces support quasi-two-dimensional (2D) electron systems that are analogous to III-V semiconductor heterostructures, but also possess superconducting, magnetic, spintronic, ferroelectric, and ferroelastic degrees of freedom. Despite these rich properties, the relatively low mobilities 2D complex-oxide interfaces appear preclude ballistic transport in 1D. Here we show LaAlO$_3$/SrTiO$_3$ interface can quantized electrons (non-superconducting) pairs within quasi-1D...
We report a gate-tunable dimensional crossover in sub-micrometer-scale channels created at the LaAlO3/SrTiO3 interface. Conducting of widths 10 nm and 200 are using conducting atomic force microscope lithography. Under sufficient negative back-gate tuning, orbital magnetoconductance channel is strongly quenched, residual signatures low-field weak-antilocalization become strikingly similar to that channel. The for takes place near conductance quantum G = 2e2/h. ability tune dimensionality...
Abstract The LaAlO 3 /SrTiO system exhibits unusual magnetic and superconducting behavior arising from electron–electron interactions whose physical origin is not well understood. Quantum transport techniques, especially those involving mesoscopic geometries, can offer insight into these interactions. Here evidence for long‐range in nanowires, measured through the phenomenon of frictional drag, reported, which current passing one nanowire induces a voltage across nearby electrically isolated...
We report frictional drag measurements between two superconducting LaAlO$_3$/SrTiO$_3$ nanowires. In these experiments, current passing through one nanowire induces a voltage across nearby electrically isolated nanowire. The signal contains both symmetric and antisymmetric components. component arises from the rectification of quantum shot noise in drive by broken symmetry resistance is ascribed to thermal during superconducting-normal transition. suppression observed when normal used as...
Oxide nanoelectronics is a rapidly growing field which seeks to develop novel materials with multifunctional behavior at nanoscale dimensions. interfaces exhibit wide range of properties that can be controlled include conduction, piezoelectric behavior, ferromagnetism, superconductivity and nonlinear optical properties. Recently, methods for controlling these extreme dimensions have been discovered developed. Here are described explicit step-by-step procedures creating LaAlO3/SrTiO3...
We report Aharonov-Bohm (AB)-type quantum interference in simply-connected devices created at the LaAlO$_3$/SrTiO$_3$ interface using conductive-atomic force microscope (c-AFM) lithography. The oscillations are multi-periodic functions of magnetic field strength, and they exhibit a substantial hysteresis with frequencies that depends on sweep direction. oscillation amplitude for lowest two approaches $e^2/h$, consistent theoretical maximum AB effect, harmonics up to third order observable....