Bulk Fermi surface determination by tuning the photoelectron kinetic energy

Abstract

The three-dimensional Fermi surface of a Cu single crystal has been measured by angle-resolved photoemission (ARUPS). Well-defined two-dimensional (2D) cuts through the bulk fcc Cu Brillouin zone have been mapped by adjusting the incident photon energy of a tunable light source. This method, conceived of as an extension of the traditional ARUPS, allows the direct visualization of Fermi surface contours from experimental two-dimensional patterns. The surface shape of constant energy at the Fermi level and its link with the translational bulk symmetries could be clearly seen by the determination of the Fermi photoelectron momentum distribution along several Brillouin zones. In addition, the 2D sections of the Fermi surface measured by photoemission have been well reproduced by a semiempirical tight binding calculation.