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Directional ballistic magnetotransport in the delafossite metals PdCoO and PtCoO
Michal Moravec, Graham Baker, Maja D. Bachmann +9
Studies of electronic transport in width-restricted channels of PdCoO have recently revealed a novel `directional ballistic' regime, in which ballistic propagation of electrons…
Microwave-frequency scanning gate microscopy of a Si/SiGe double quantum dot
Artem O. Denisov, Seong W. Oh, Gordian Fuchs +6
Conventional quantum transport methods can provide quantitative information on spin, orbital, and valley states in quantum dots, but often lack spatial resolution. Scanning tunneli…
Feedback Lock-in: A versatile multi-terminal measurement system for electrical transport devices
Arthur W. Barnard, Evgeny Mikheev, Joe Finney +2
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…
Directional ballistic transport in the two-dimensional metal PdCoO2
Maja D. Bachmann, Aaron L. Sharpe, Arthur W. Barnard +8
In an idealized infinite crystal, the material properties are constrained by the symmetries of its unit cell. Naturally, the point-group symmetry is broken by the sample shape of a…
Evidence of orbital ferromagnetism in twisted bilayer graphene aligned to hexagonal boron nitride
Aaron L. Sharpe, Eli J. Fox, Arthur W. Barnard +5
We have previously reported ferromagnetism evinced by a large hysteretic anomalous Hall effect in twisted bilayer graphene (tBLG). Subsequent measurements of a quantized Hall resis…
Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
Aaron L. Sharpe, Eli J. Fox, Arthur W. Barnard +5
When two sheets of graphene are stacked at a small twist angle, the resulting flat superlattice minibands are expected to strongly enhance electron-electron interactions. Here we p…
Absorptive pinhole collimators for ballistic Dirac fermions in graphene
Arthur W. Barnard, Alex Hughes, Aaron L. Sharpe +3
Ballistic electrons in solids can have mean free paths far larger than the smallest features patterned by lithography. This has allowed development and study of solid-state electro…
Entropic Spectral Broadening in Carbon Nanotube Resonators
Arthur W. Barnard, Vera Sazonova, Arend M. van der Zande +1
We simulated the behavior of suspended carbon-nanotube (CNT) resonators over a broad range of temperatures to address the unexplained spectral broadening and frequency shifts seen…