Zigzag phosphorene nanoribbons: one dimensional resonant tunnelling in two dimensional atomic crystals

We theoretically investigate phosphorene zigzag nanoribbons as a platform for constriction engineering. In the presence of a constriction at one of the edges, quantum confinement of edge protected states reveals breit-wigner-like resonant tunneling, if the edge is uncoupled to the other. If the constriction is narrow enough to promote coupling between edges, it gives rise to fano-like as well as anti-resonances in the transmission spectrum. These effects are shown to mimic an atomic chain like behavior in a two dimensional atomic crystal.