A theoretical study demonstrates the possibility of inducing a transition from a direct to indirect band gap in graphene nanoribbons. Opening a semiconducting band gap in graphene is one of the most ...

"All previous studies of the band gap in insulating hydrogen under compression were based on an indirect scheme using optical measurements," explains Dr. Mao. The team used high-brilliance, ...

Layered group-VIB transition metal dichalcogenides (with the formula of MX2) are known to show a transition from an indirect band gap in the thick n-monolayer stack (MX2)n to a direct band gap at the ...