We demonstrate that, at the onset of conduction, an electrostatically defined quantum wire in bilayer graphene (BLG) with an interlayer asymmetry gap may act as a 1D semimetal, due to the multiple minivalley dispersion of its lowest subband. Formation of a non-monotonic subband coincides with a near-degeneracy between the bottom edges of the lowest two subbands in the wire spectrum, suggesting an 8e2/h step at the conduction threshold, and the semimetallic behaviour of the lowest subband in the wire would be manifest as resonance transmission peaks on an 8e2/h conductance plateau.
@article{arxiv.1904.00918,
title = {Semimetallic features in quantum transport through a gate-defined point contact in bilayer graphene},
author = {Thomas L M Lane and Angelika Knothe and Vladimir I Fal'ko},
journal= {arXiv preprint arXiv:1904.00918},
year = {2019}
}