Arthur Barnard
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View article: All-Dielectric Metasurface with a Two-Dimensional Locally Flat Photonic Band
All-Dielectric Metasurface with a Two-Dimensional Locally Flat Photonic Band Open
Photonic flatbands offer promising light-matter interaction due to their unique slow-light nature. In recent years, flatbands have also attracted significant interest in optical engineering because of their angle-insensitive resonant chara…
View article: Visible Wavelength Flatband in a Gallium Phosphide Metasurface
Visible Wavelength Flatband in a Gallium Phosphide Metasurface Open
Engineering the dispersion of light in a metasurface allows for controlling the light-matter interaction strength between light confined in the metasurface and materials placed within its near-field. Specifically, engineering a flatband di…
View article: Feedback lock-in: A versatile multi-terminal measurement system for electrical transport devices
Feedback lock-in: A versatile multi-terminal measurement system for electrical transport devices Open
We present the design and implementation of a measurement system that enables parallel drive and detection of small currents and voltages at numerous electrical contacts to a multi-terminal electrical device. This system, which we term a f…
View article: Microwave-Frequency Scanning Gate Microscopy of a Si/SiGe Double Quantum Dot
Microwave-Frequency Scanning Gate Microscopy of a Si/SiGe Double Quantum Dot Open
Conventional quantum transport methods can provide quantitative information on spin, orbital, and valley states in quantum dots, but often lack spatial resolution. Scanning tunneling microscopy, on the other hand, provides exquisite spatia…
View article: Directional ballistic transport in the two-dimensional metal PdCoO2
Directional ballistic transport in the two-dimensional metal PdCoO2 Open
View article: Microwave-frequency scanning gate microscopy of a Si/SiGe double quantum\n dot
Microwave-frequency scanning gate microscopy of a Si/SiGe double quantum\n dot Open
Conventional quantum transport methods can provide quantitative information\non spin, orbital, and valley states in quantum dots, but often lack spatial\nresolution. Scanning tunneling microscopy, on the other hand, provides\nexquisite spa…
View article: Feedback Lock-in: A versatile multi-terminal measurement system for electrical transport devices
Feedback Lock-in: A versatile multi-terminal measurement system for electrical transport devices Open
We present the design and implementation of a measurement system that enables parallel drive and detection of small currents and voltages at numerous electrical contacts to a multi-terminal electrical device. This system, which we term a f…
View article: Directional ballistic transport in the two-dimensional metal PdCoO2
Directional ballistic transport in the two-dimensional metal PdCoO2 Open
In an idealized infinite crystal, the material properties are constrained by the symmetries of its unit cell. However, the point-group symmetry is broken by the sample shape of any finite crystal, but this is commonly unobservable in macro…
View article: Magnetic anisotropy in twisted bilayer graphene and ABC-trilayer graphene aligned with hexagonal boron nitride.
Magnetic anisotropy in twisted bilayer graphene and ABC-trilayer graphene aligned with hexagonal boron nitride. Open
this property, we argue that the QAH effect is likely only when (i) the (θGG, θGBN) twist-angle-pair is close enough to a commensurate point that the two moiré patterns yield a supermoiré pattern with a sufficiently long length scale, and …
View article: Evidence of Orbital Ferromagnetism in Twisted Bilayer Graphene Aligned to Hexagonal Boron Nitride
Evidence of Orbital Ferromagnetism in Twisted Bilayer Graphene Aligned to Hexagonal Boron Nitride Open
We have previously reported ferromagnetism evinced by a large hysteretic anomalous Hall effect in twisted bilayer graphene (tBLG). Subsequent measurements of a quantized Hall resistance and small longitudinal resistance confirmed that this…
View article: Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO2
Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO2 Open
scientific data underpinning "Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO2"
View article: Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO2
Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO2 Open
scientific data underpinning "Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO2"
View article: Data for: Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
Data for: Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene Open
This archive contains the data and Python code generating figures for the article "Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene" by Aaron L. Sharpe, Eli J. Fox, Arthur W. Barnard, Joe Finney, Kenji Watana…
View article: New correlated phenomena in magic-angle twisted bilayer graphene/s
New correlated phenomena in magic-angle twisted bilayer graphene/s Open
View article: Absorptive pinhole collimators for ballistic Dirac fermions in graphene
Absorptive pinhole collimators for ballistic Dirac fermions in graphene Open
View article: Microtweezers for studying vibrating carbon nanotubes
Microtweezers for studying vibrating carbon nanotubes Open
Vibrational modes in suspended carbon nanotubes (CNTs) are incredibly soft, which makes them sensitive to small forces and prime candidates as force sensors. This same property, combined with the stiffness of the CNT to stretching, makes t…