Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 49: Electronic structure IV
O 49.2: Talk
Friday, March 31, 2006, 11:30–11:45, WIL B321
Fermi Surface of Be(0001) — •Ivana Vobornik1, Jun Fujii1, Mattia Mulazzi1,2, Giancarlo Panaccione1, Michael Hochstrasser3, and Giorgio Rossi1,2 — 1TASC National Laboratory, INFM-CNR, S.S. 14, km 163.5, I-34012 Trieste — 2Dipartimento di Fisica, Universita di Modena e Reggio Emilia, Via Campi 213/A, I-41100 Modena — 3Laboratorium für Festkörperphysik, Wolfgang-Pauli-Str. 16, ETH Hönggerberg, CH-8093 Zürich
We used angle-resolved photoemission (ARPES) to determine the Fermi surface of Be(0001). The Fermi surface cuts that were measured for more than twenty different photon energies enabled us to reconstruct the three-dimensional Fermi surface. We find that the Fermi surface obtained from the ARPES data differs significantly from the Fermi surface of bulk beryllium determined by de Haas - van Alphen oscillations. The so-called cigar features appear to be significantly shorter, while the coronet is enlarged. Furthermore, new states appear in the gap between the two subsequent cigars. This change of the Fermi surface topology is the consequence of the surface relaxation in Be(0001) and the ARPES surface sensitivity (mean free pass in the photon energy range used in our experiment is only 2-3 Å). Our data are relevant for any theory aiming to describe the considerable surface relaxation in Be(0001).