A. H. MacDonald

Strong Coulomb drag and broken symmetry in double-layer graphene

Room-temperature superfluidity in graphene bilayers

Because graphene is an atomically two-dimensional gapless semiconductor with nearly identical conduction and valence bands, graphene-based bilayers are attractive candidates for...

Evidence for a spontaneous gapped state in ultraclean bilayer graphene

At the charge neutrality point, bilayer graphene (BLG) is strongly susceptible to electronic interactions and is expected to undergo a phase transition to a state with spontaneo...

Universal Intrinsic Spin Hall Effect

We describe a new effect in semiconductor spintronics that leads to dissipationless spin currents in paramagnetic spin-orbit coupled systems. We argue that in a high-mobility tw...

Quantum Hall Ferromagnetism in Graphene

Graphene is a two-dimensional carbon material with a honeycomb lattice and Dirac-like low-energy excitations. When Zeeman and spin-orbit interactions are neglected, its Landau l...

Moiré bands in twisted double-layer graphene

A moiré pattern is formed when two copies of a periodic pattern are overlaid with a relative twist. We address the electronic structure of a twisted two-layer graphene system, s...

Tunable moiré bands and strong correlations in small-twist-angle bilayer graphene

Significance Accurately controlled, very long wavelength moiré patterns are realized in small-twist-angle bilayer graphene, and studied using electron transport and scanning pro...

Interlayer coupling in ferromagnetic semiconductor superlattices

We develop a mean-field theory of carrier-induced ferromagnetism in diluted\nmagnetic semiconductors. Our approach represents an improvement over standard\nRKKY model allowing s...

Superconductors, orbital magnets and correlated states in magic-angle bilayer graphene

Superconductivity can occur under conditions approaching broken-symmetry parent states1. In bilayer graphene, the twisting of one layer with respect to the other at ‘magic’ twis...