Mapping the Fermi surface of Cu using ARUPS

Abstract

The topology of the Fermi surface of copper has been illuminated in a direct fashion using the technique of photoelectron spectroscopy. Full emission hemisphere intensity distributions of photoelectrons excited from the Fermi energy by photons of various energies have been compared with the theoretically expected loci of such transitions and good agreement was found. An alternative method of determining the shape of a slice through the bulk Fermi surface involving the use of constant initial state spectroscopy has also been used for the first time. In particular, part of the Fermi surface of Cu in the ΓL[1̄1̄2] plane has been mapped in this way by following the k-space dispersion of transitions originating at the Fermi level as a function of photon energy.