  We investigate the impact of strained nanobubbles on the conductance
characteristics of graphene nanoribbons using a combined molecular dynamics -
tight-binding simulation scheme. We describe in detail how the conductance,
density of states, and current density of zigzag or armchair graphene
nanoribbons are modified by the presence of a nanobubble. In particular, we
establish that low-energy electrons can be confined in the vicinity or within
the nanobubbles by the delicate interplay between the pseudomagnetic field
pattern created by the shape of the bubble, mode mixing, and substrate
interaction. The coupling between confined evanescent states and propagating
modes can be enhanced under different clamping conditions, which translates
into Fano resonances in the conductance traces.
