  While many photoemission studies have dealt with both the bulk band structure
and various surface states and resonances, the unoccupied electronic structure
above the Fermi level of the Bi(111) surface has not yet been measured directly
although understanding of this model semi-metal is of great interest for
topological insulators, spintronics and related fields. We use angle-resolved
two-photon photoemission to directly investigate the occupied and unoccupied p
bands of Bi, including the bulk hole pocket at the T point, as well as the
image potential states and surface states of Bi(111).
