Today at Berkeley Lab

Twist Solves Bilayer Graphene Mystery

Researchers have discovered a unique new twist to the story of graphene and, in the process, appear to have solved a mystery that has held back device development. Working at the Advanced Light Source, scientists applied angle-resolved photoelectron spectroscopy (ARPES) to bilayer graphene. Through direct band-structure measurements and calculations, they discovered that in the stacking of graphene monolayers, subtle misalignments arise, creating an almost imperceptible twist in the final bilayer graphene. Tiny as it is—as small as 0.1 degree—this twist can have surprisingly strong effects on the bilayer graphene’s electronic properties. More>