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Extended Fractional Chern Insulators Near Half Flux in Twisted Bilayer Graphene Above the Magic Angle
Joe Finney, Aaron L. Sharpe, Linsey K. Rodenbach +7
Fractional Chern insulators (FCIs) -- the lattice analog of fractional quantum Hall states -- form as fractionalized quasiparticles emerge in a partially-filled Chern band. This fr…
Deterministic fabrication of graphene hexagonal boron nitride moiré superlattices
Rupini V. Kamat, Aaron L. Sharpe, Mihir Pendharkar +11
The electronic properties of moiré heterostructures depend sensitively on the relative orientation between layers of the stack. For example, near-magic-angle twisted bilayer graphe…
Unusual magnetotransport in twisted bilayer graphene from strain-induced open Fermi surfaces
Xiaoyu Wang, Joe Finney, Aaron L. Sharpe +7
Anisotropic hopping in a toy Hofstadter model was recently invoked to explain a rich and surprising Landau spectrum measured in twisted bilayer graphene away from the magic angle.…
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…
Unusual magnetotransport in twisted bilayer graphene
Joe Finney, Aaron L. Sharpe, Eli J. Fox +10
We present transport measurements of bilayer graphene with 1.38° interlayer twist and apparent additional alignment to its hexagonal boron nitride cladding. As with other devices w…
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…
Monolayer Semiconductor Auger Detector
Colin M. Chow, Hongyi Yu, John R. Schaibley +9
Auger recombination in semiconductors is a many-body phenomenon in which recombination of electrons and holes is accompanied by excitation of other charge carriers. Being nonradiat…
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…
Edge conduction in monolayer WTe2
Zaiyao Fei, Tauno Palomaki, Sanfeng Wu +7
A two-dimensional topological insulator (2DTI) is guaranteed to have a helical 1D edge mode in which spin is locked to momentum, producing the quantum spin Hall effect and prohibit…