Université de Neuchâtel

Angle-scanned photoemission: Fermi surface mapping and structural determination

Aebi, Philipp ; Fasel, Roman ; Naumovic, D. ; Hayoz, J. ; Pillo, Th. ; Bovet, M ; Agostino, R. G. ; Patthey, L. ; Schlapbach, Louis ; Gil, F. P. ; Berger, Helmuth ; Kreutz, T. J. ; Osterwalder, Jürg

In: Surface Science, 1998, vol. 402-404, p. 614-622

A brief survey of the angle-scanned photoemission technique is given. It incorporates two complementary methods in one: 1. Mapping of X-ray excited photoelectron intensities over virtually the complete hemisphere above the sample surface results in extended data sets where important surface-geometrical structure information is extracted and even “fingerprinting” is possible. This...

Université de Neuchâtel

Fermi-surface topology of rare-earth dihydrides

Koitzsch, Christian ; Hayoz, J. ; Bovet, M ; Clerc, Florian ; Despont, Laurent ; Ambrosch-Draxl, Claudia ; Aebi, Philipp

In: Physical Review B, 2004, vol. 70, no. 165114, p. 1-10

We report high-resolution angle-resolved photoemission experiments on epitaxial thin films of different rare-earth (RE) dihydrides (RE=Gd,La) and of YH2 and ScH2 . It is found through ab initio calculations and confirmed by Fermi surface mapping that the electronic structure becomes very similar upon hydrogenation, rendering the studied dihydrides...

Université de Neuchâtel

Lattice-distortion-enhanced electron-phonon coupling and Fermi surface nesting in 1T-TaS2

Clerc, Florian ; Battaglia, Corsin ; Bovet, M ; Despont, Laurent ; Monney, Claude ; Cercellier, Hervé ; Garnier, Michael Bernard Gunnar ; Aebi, Philipp ; Berger, Helmuth ; Forró, László

In: Physical Review B, 2006, vol. 74, no. 155114, p. 1-7

The temperature dependence of the electronic structure of the quasi-two-dimensional material 1T-TaS2 is revisited by considering angle-resolved photoemission spectroscopy (ARPES) and density functional theory to calculate the imaginary part of the static electronic susceptibility characterizing the nesting strength. While nesting appears to play a role in the high temperature...