Direct measurements of theL-gap surface states on the (111) face of noble metals by photoelectron spectroscopy

Direct observation of many-body charge density oscillations in a two-dimensional electron gas

“…These similarities point into the direction of a general physical process underlying our observations that is not related to the peculiar electronic structure of one of the systems. Similar observations assigned the second ring to bulk states 29,30 , a statement in contradiction with both photoemission data and ab initio calculations 17,27 .…”

Decay of electronic excitations at metal surfaces

“…In this approach the contributions from different phonon modes, in particular the Rayleigh surface mode as well as bulk phonons and the general temperature dependence are taken into account. They also obtain the high temperature behavior represented by l. Their approach is based on: (i) Thomas-Fermi screened Ashcroft electron-ion potentials, (ii) one-electron states obtained from the model potential, and (iii) a simple force-constant phonon model calculation that gives results for the phonon spectrum in good agreement with recently published experimental data [52,86,99,100].…”

“…The most recent results for the G states on the noble metals have been obtained with unprecedented resolution and quality by Hüfner and co-workers [100,121,122]. The breakthrough is due to the advent of ''third-generation'' electron energy analyzers, which allow ultra-high-resolution photoelectron spectroscopy with resolution parameters DE ¼ 2:5 meV and Dy ¼ AE0:15 as verified experimentally after excitation with monochromatized HeI radiation (ho ¼ 21:22 eV).…”

“…The breakthrough is due to the advent of ''third-generation'' electron energy analyzers, which allow ultra-high-resolution photoelectron spectroscopy with resolution parameters DE ¼ 2:5 meV and Dy ¼ AE0:15 as verified experimentally after excitation with monochromatized HeI radiation (ho ¼ 21:22 eV). Simultaneously photon flux and spectrometer sensitivity are sufficient to take relevant data within a few minutes with the sample at temperatures around 20 K [100,121]. (1 1 1) obtained at different temperatures after excitation with the doublet line (ho ¼ 11:83, 11.62 eV) of an ArI discharge lamp.…”

Theoretical probing of inelastic spin-excitations in adatoms on surfaces

“…In order to understand this intriguing behavior, we analyzed the differences between both substrates. The Ag(111) surface is peculiar since it has a surface state with an onset located much closer to the Fermi energy (E F ) compared to the one found on Cu(111) [37].…”