Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 94: 2D Materials V: Novel Systems

O 94.5: Vortrag

Freitag, 5. April 2019, 11:30–11:45, H9

Band Renormalization of Blue Phosphorus on Au(111) — •Evangelos Golias^1,2, Maxim Krivenkov¹, Andrei Varykhalov¹, Jaime Sànchez-Barriga¹, and Oliver Rader¹ — ¹Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein Straße 15, 12489 Berlin, Germany — ²Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

Most recently, theoretical calculations predicted the stability of a two-dimensional honeycomb lattice of phosphorus atoms named blue phosphorus. We report on the successful growth of blue phosphorus on Au(111) surface using molecular beam epitaxy. We studied in detail the structural properties of blue phosphorus using low-energy electron diffraction, scanning tunneling microscopy and density functional theory calculations. Furthermore, by employing angle-resolved photoemission spectroscopy measurements we mapped the electronic structure of this novel two-dimensional allotrope of phosphorus. We find that the substrate breaks the sublattice symmetry of blue phosphorus leading to an orbital-dependent band renormalization upon the formation of a (4 × 4) superstructure on Au(111). Most importantly, the semiconducting two-dimensional phosphorus realizes its valence band maximum at 0.9 eV binding energy, however, shifted in momentum space due to the substrate-blue phosphorus interaction.