A5058580442- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- Semiconductor Quantum Structures and Devices
- Nanowire Synthesis and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Graphene research and applications
- Surface and Thin Film Phenomena
- Photonic and Optical Devices
- 2D Materials and Applications
- Inorganic Chemistry and Materials
- Molecular Junctions and Nanostructures
- Superconductivity in MgB2 and Alloys
- Microstructure and mechanical properties
- Quantum Information and Cryptography
- Diamond and Carbon-based Materials Research
- Photorefractive and Nonlinear Optics
- Metallurgy and Material Forming
- Structural Behavior of Reinforced Concrete
- Advanced Condensed Matter Physics
- Terahertz technology and applications
- High-pressure geophysics and materials
- Metamaterials and Metasurfaces Applications
- Innovative concrete reinforcement materials
- Quantum optics and atomic interactions
New York University
2021-2024
University of Pittsburgh
2017-2023
Guangxi University
2022
Ministry of Education of the People's Republic of China
2022
Missouri University of Science and Technology
2004
Topological superconductors can host Majorana quasiparticles which supersede the fermion/boson dichotomy and offer a pathway to fault tolerant quantum computation. In one-dimensional systems zero-energy states are bound ends of topologically superconducting regions. An experimental signature state is conductance peak at zero source-drain voltage bias in tunneling experiment. Here, we identify bulk topological phase semiconductor nanowire coupled conventional superconductor. We map out its...
Abstract There has recently been a surge of interest in studying the superconducting diode effect (SDE) partly due to possibility uncovering intrinsic properties material system. A change sign SDE at finite magnetic field previously attributed different mechanisms. Here, we observe epitaxial Al-InAs Josephson junctions with strong Rashba spin-orbit coupling (SOC). We show that this strongly depends on orientation in-plane field. In presence field, SDE. Simulation and measurement supercurrent...
We perform tunneling measurements on indium antimonide nanowire/superconductor hybrid devices fabricated for the studies of Majorana bound states. At finite magnetic field, resonances that strongly resemble states, including zero-bias pinning, become common to point ubiquity. Since states are predicted in only a limited parameter range nanowire devices, we seek an alternative explanation observed peaks. With help self-consistent Poission-Schr\"odinger multiband model developed parallel,...
Voltage-tunable superconductor-semiconductor devices offer a unique platform to realize dynamic tunability in superconducting quantum circuits. By galvanically connecting gated InAs-Al Josephson junction coplanar waveguide resonator, we demonstrate the use of wide-range gate-tunable element. We show that resonant frequency is controlled via inductance and non-linearity voltage-controlled non-dissipative as case with conventional Al-AlO$_{x}$ junctions. As gate voltage decreased, inductive...
The tunneling of Cooper pairs across a Josephson junction (JJ) allows for the nonlinear inductance necessary to construct superconducting qubits, amplifiers, and various other quantum circuits. An alternative approach using hybrid superconductor-semiconductor JJs can enable qubit architectures with all electric control. Here we present continuous-wave time-domain characterization gatemon qubits coplanar waveguide resonators based on an InAs two-dimensional electron gas. We show that...
We investigate the effects of an in-plane magnetic field on weak antilocalization signature near-surface quantum wells lacking bulk and inversion symmetry. The measured magnetoconductivity, which is conductivity as a function out-of-plane field, exhibits strong anisotropy with respect to direction field. twofold symmetry observed magnetoanisotropy originates from competition between Rashba Dresselhaus spin-orbit couplings. high sensitivity spin texture produced by combined Zeeman fields...
Majorana bound states (MBSs) are quasiparticles that their own antiparticles. They predicted to emerge as zero-energy modes localized at the boundary of a topological superconductor. No intrinsic superconductor is known date. However, by interfacing conventional superconductors and semiconductors with strong spin-orbit coupling, it possible create system hosting states. Hence, epitaxial have emerged an attractive material atomically sharp interfaces broad flexibility in device fabrications...
The critical current response to an applied out-of-plane magnetic field in a Josephson junction provides insight into the uniformity of its distribution. In junctions with semiconducting weak links, carrier density, and therefore overall distribution, can be modified electrostatically via metallic gates. Here, we show local control distribution epitaxial Al-InAs equipped five minigates. We demonstrate that not only width defined but also profile locally adjusted form superconducting quantum...
There has recently been a surge of interest in studying the superconducting diode effect (SDE) partly due to possibility uncovering intrinsic properties material system. A change sign SDE at finite magnetic field previously attributed different mechanisms. Here, we observe epitaxial Al-InAs Josephson junctions with strong Rashba spin-orbit coupling (SOC). We show that this strongly depends on orientation in-plane field. In presence field, SDE. Simulation and measurement supercurrent suggest...
A mesoscale, variational simulation of grain growth in two-dimensions has been used to explore the effects boundary properties on character distribution. Anisotropy energy a stronger influence distribution than anisotropy mobility. As proceeds from an initially random distribution, reaches steady state that depends energy. If only lattice misorientation, then population and are related by Boltzmann When both misorientation orientation, is more complex changes gradient with respect orientation.
We fabricate three-terminal hybrid devices consisting of a semiconductor nanowire segment proximitized by grounded superconductor and having tunnel probe contacts on both sides. By performing simultaneous tunneling measurements, we identify delocalized states, which can be observed from ends, states localized near one the barriers. The traced zero magnetic field to fields beyond 0.5 T. Within regime that supports search for correlated low-energy features consistent with presence Majorana...
Transparent contact interfaces in superconductor–graphene hybrid systems are critical for realizing superconducting quantum applications. Here, we examine the effect of edge fabrication process on transparency aluminum–graphene junction. We show significant improvement our junctions by promoting chemical component etch process. Our results compare favorably with state-of-the-art graphene Josephson junctions. The findings study contribute to advancing knowledge edge-contacted
Planar Josephson junctions (JJs) have emerged as a promising platform for the realization of topological superconductivity and Majorana zero modes. To obtain robust quasi one-dimensional (1D) superconducting states using planar JJs, limiting number 1D Andreev bound states' subbands that can be present, increasing size gap, are two fundamental challenges. It has been suggested both problems addressed by properly designing interfaces between JJ's normal region leads. We fabricated with...
Majorana bound states (MBSs) are quasiparticles which their own antiparticles. They predicted to emerge as zero-energy modes localized at the boundary of a topological superconductor. No intrinsic superconductor is known date. However, by interfacing conventional superconductors and semiconductors with strong spin--orbit coupling it possible create system hosting states. Hence epitaxial have emerged an attractive materials atomically sharp interfaces broad flexibility in device fabrications...
We investigate the effects of an in-plane magnetic field on weak antilocalization signature near-surface quantum wells lacking bulk and inversion symmetry. The measured magnetoconductivity exhibits a strong anisotropy with respect to direction field. two-fold symmetry observed magneto-anisotropy originates from competition between Rashba Dresselhaus spin-orbit couplings. high sensitivity spin texture produced by combined Zeeman fields results in very large ratios, reaching 100%. Using...