  The pressure dependence of the Fermi surface of arsenic is examined using the
technique of Wannier interpolation, enabling a dense sampling of the Brillouin
zone and the ability to capture fine features within it. Focusing primarily on
the A7 to simple-cubic phase transition, we find that this semimetal to metal
transition is accompanied by the folding of Fermi surfaces. The pressure
dependence of the density of states (DOS) of arsenic indicates that the onset
of the Peierls-type cubic to rhombohedral distortion is signified by the
appearance of emerging van Hove singularities in the DOS, especially around the
Fermi level. As we noted in an earlier study, high levels of convergence are
consequently required for an accurate description of this transition.
