▎ 摘　　要

We demonstrate that, at the onset of conduction, an electrostatically defined quantum wire in bilayer graphene with an interlayer asymmetry gap may act as a one-dimensional semimetal, due to the multiple-minivalley dispersion of its lowest subband. Formation of a nonmonotonic subband coincides with a near-degeneracy between the bottom edges of the lowest two subbands in the wire spectrum, suggesting an 8e(2)/h step at the conduction threshold, and the semimetallic behavior of the lowest subband in the wire would be manifest as resonance transmission peaks on an 8e(2)/h conductance plateau.