  Most recently, theoretical calculations predicted the stability of a novel
two-dimensional phosphorus honeycomb lattice named blue phosphorus. Here, we
report on the growth of blue phosphorus on Au(111) and unravel its structural
details using diffraction, microscopy and theoretical calculations. Most
importantly, by utilizing angle-resolved photoemission spectroscopy we identify
its momentum-resolved electronic structure. We find that Au(111) breaks the
sublattice symmetry of blue phosphorus leading to an orbital-dependent band
renormalization upon the formation of a (4x4) superstructure. Notably, 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-induced band renormalization.
