A5056219428- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Ferroelectric and Piezoelectric Materials
- Ferroelectric and Negative Capacitance Devices
- Analytical Chemistry and Sensors
- Magnetic and transport properties of perovskites and related materials
- Acoustic Wave Resonator Technologies
- Underwater Acoustics Research
- Electron and X-Ray Spectroscopy Techniques
- MXene and MAX Phase Materials
- Natural Resources and Economic Development
- Modular Robots and Swarm Intelligence
- Silicon Carbide Semiconductor Technologies
- Quantum and electron transport phenomena
- Metal and Thin Film Mechanics
- Zeolite Catalysis and Synthesis
- Advanced Condensed Matter Physics
- Graphene and Nanomaterials Applications
- Advanced Sensor and Energy Harvesting Materials
- Bioactive natural compounds
- Silicon Nanostructures and Photoluminescence
- Advanced Materials Characterization Techniques
- Surface and Thin Film Phenomena
- Geophysical Methods and Applications
- 2D Materials and Applications
University of Pittsburgh
2012-2025
Pittsburgh Quantum Institute
2020-2024
Carnegie Mellon University
2024
Renmin University of China
2023
University of Oxford
2021
Shenyang Agricultural University
2020
The discovery of two-dimensional superconductivity in <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>LaAlO</a:mi></a:mrow><a:mn>3</a:mn></a:msub><a:mo stretchy="false">/</a:mo><a:msub><a:mrow><a:mi>KTaO</a:mi></a:mrow><a:mn>3</a:mn></a:msub></a:mrow></a:math> (111) and (110) interfaces has raised significant interest this system. In paper, we report the first successful fabrication a direct current superconducting quantum interference...
Freestanding membranes of electronically reconfigurable complex oxide heterostructure are demonstrated.
Recent reports of superconductivity at KTaO3 (KTO) (110) and (111) interfaces have sparked intense interest due to the relatively high critical temperature as well other properties that distinguish this system from more extensively studied SrTiO3 (STO)-based heterostructures. Here, we report reconfigurable creation conducting structures intrinsically insulating LaAlO3/KTO(110) interfaces. Devices are created using two distinct methods previously developed for STO-based heterostructures: (1)...
We describe a method to control the insulator–metal transition at LaAlO3/SrTiO3 interface using ultra-low-voltage electron beam lithography. Compared previous reports that utilize conductive atomic force microscope (c-AFM) lithography, this approach can provide comparable resolution (∼10 nm) write speeds (10 mm/s) are up 10 000× faster than c-AFM. The writing technique is nondestructive, and state reversible via prolonged exposure air. Transport properties of representative devices measured...
A wide family of two dimensional (2D) systems, including stripe-phase superconductors, sliding Luttinger liquids, and anisotropic 2D materials, can be modeled by an array coupled one-dimensional (1D) electron channels or nanowire arrays. Here we report experiments in arrays conducting nanowires with gate field tunable interwire coupling, that are programmed at the LaAlO$_3$/SrTiO$_3$ interface. We find a magnetically-tuned metal-to-insulator transition which transverse resistance increases...
Coupled quasi-one-dimensional (quasi-1D) electron systems host rich emergent physics that cannot be accounted for by understanding isolated 1D alone. Open questions remain about how transport in these arrays can manipulated the application of external electric and magnetic fields. In this theoretical study, we consider a pair coupled nanowires with non-interacting electrons. We find metal-insulator transition is induced an out-of-plane field transverse potential bias on array such wires....
Artificially ordered quantum dot (QD) arrays, where confined carriers can interact via direct exchange coupling, may create unique functionalities such as cluster qubits and spintronic bandgap systems. Development of arrays for computing requires fine control over QD size spatial arrangement on the sub-35 nm length scale. We employ electron-beam irradiation to locally decompose ambient hydrocarbons onto a bare Si (001) surface. These carbonaceous patterns are annealed in ultra-high vacuum...
The ability to create superlattices in van der Waals (vdW) heterostructures via moir\'e interference heralded a new era the science and technology of two-dimensional materials. Through precise control twist angle, flat bands strongly correlated phases have been engineered. twisting vdW layers is some sense bottom-up approach--a single parameter can dial wide range periodic structures. Here, we describe top-down approach engineering nanoscale potentials using buried programmable ferroelectric...
We demonstrate an approach to creating nanoscale potentials in van der Waals layers integrated with a buried programmable ferroelectric layer. Using ultra-low-voltage electron beam lithography (ULV-EBL), we can program the polarization Al
Strontium titanate (STO), apart from being a ubiquitous substrate for complex-oxide heterostructures, possesses multitude of strongly-coupled electronic and mechanical properties. Surface acoustic wave (SAW) generation detection offers insight into electromechanical couplings that are sensitive to quantum paraelectricity other structural phase transitions. Propagating SAWs can interact with STO-based nanostructures, in particular LaAlO$_3$/SrTiO$_3$ (LAO/STO). Here we report SAW within...
Strontium titanate (STO), apart from being a ubiquitous substrate for complex-oxide heterostructures, possesses multitude of strongly coupled electronic and mechanical properties. Surface acoustic wave (SAW) generation detection offers insight into electromechanical couplings that are sensitive to quantum paraelectricity other structural phase transitions. Propagating SAWs can interact with STO-based nanostructures, in particular ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ (LAO/STO). Here,...
The discovery of two-dimensional superconductivity in LaAlO3/KTaO3 (111) and (110) interfaces has raised significant interest this system. In manuscript we report the first successful fabrication a superconducting quantum interference device (DC-SQUID) KTO key elements, weak links, are created by conductive atomic force microscope (c-AFM) lithography which can reversibly control conductivity at LAO/KTO(110) interface with nanoscale resolution. periodic modulation SQUID critical current,...