Regensburg 2002 – wissenschaftliches Programm

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O: Oberflächenphysik

O 13: Postersitzung (Adsorption an Oberfl
ächen, Elektronische Struktur, Magnetismus in reduzierten Dimensionen, Epitaxie und Wachstum, Halbleiteroberfl
ächen und -grenzfl
ächen, Organische Dünnschichten)

O 13.28: Poster

Montag, 11. März 2002, 18:00–21:00, Bereich C

Visualization of the Electronic Structure of Metal Surfaces with Scanning Tunneling Spectroscopy. — •J.I. Pascual, Z. Song, J.J. Jackiw, M. Hansmann, G. Ceballos, H. Conrad, K. Horn, and H.-P. Rust — Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, Berlin 14195, Germany

Using scanning tunneling spectroscopy at low temperature, we analyze the electronic structure of several metal surfaces, with an increasing level of complexity: from the (111) surfaces of noble metals, with isotropic s-p states, to anisotropic alloy surfaces like NiAl(110). We measure the energy dependence of spatial oscillations of the differential tunnel conductance in the proximity of scattering potentials, and make use of Fourier transformation of the real space data to represent the electronic states’ topology for energies up to the vacuum level, and in the whole first-Brillouin zone. In this way, we have access not only to surface states, but also surface resonances and bulk band edges give rise to observable signal in our reciprocal space maps.