Electronic properties of one and two dimensional phosphorene on curved copper

Phosphorene is an appealing 2D material that have attracted recent interest due to its metal to semiconducting properties depending on the dimensionality of the layer. While on Cu(111) a Dirac cone has been claimed for a 2D layer, on Ag(111) one-dimensional P chains have been found with a 1.5eV bandgap. We observe a large number of different phases when depositing P on curved Cu samples that feature straight and kinked steps before P adsorption. After phosphorene formation, close to (111) the steps of the substrate are maintained and the 2D structure preserves. For vicinal angles larger 7°, faceting sets in. We observe P at the border of the steps with a rather 1-D electronic structure and the opening of a band gap. Nevertheless, our lab based ARPES measurements are insufficient for a complete picture of the system, therefore we ask for additional synchrotron based measurements.