Topological quantum well resonances in metal overlayers

Lifetimes of quantum well states and resonances in Pb overlayers on Cu(111)

A. Zugarramurdi,1,2 N. Zabala,1,2,3 V. M. Silkin,2,3,4,5 A. G. Borisov,6 and E. V. Chulkov2,3,4 1Elektrizitatea eta Elektronika Saila, Zientzia eta Teknologia Fakultatea, UPV/EHU, 644 P.K., 48080 Bilbao, Spain 2Centro de Física de Materiales CFM, Centro Mixto CSIC-UPV/EHU, 20018 San Sebastián/Donostia, Spain 3Donostia International Physics Center (DIPC), P. de Manuel Lardizabal 4, 20018 San Seb...

Valence-Electron Resonances in Alkali-Metal Overlayers Observed via Photoemission Line-Shape Changes.

Alkali metals adsorbed on metal surfaces attract interest as prototype examples of simple chemisorption [1] and simple metal quantum well systems [2]. In spite of the numerous studies made the electronic structure is still rather poorly characterized. So far, observations of the filled states have been limited to the discrete states that may be formed by alkali metal valence electrons in the en...

Photoinduced plasmon excitations in alkali-metal overlayers

Collective surface excitations in alkali-metal overlayers are observed using photoyield spectroscopy. Spectra for Na and K on Al~111! reveal a multipole surface plasmon and bulklike overlayer plasmon. In contrast, Li on Al exhibits only the multipole mode. In the submonolayer regime, all three alkali metals provide evidence for the threshold excitation. Time-dependent density-functional calcula...

CO chemisorption at metal surfaces and overlayers.

Quantum nature of the proton in water-hydroxyl overlayers on metal surfaces.

Using ab initio path-integral molecular dynamics, we show that water-hydroxyl overlayers on transition metal surfaces exhibit surprisingly pronounced quantum nuclear effects. The metal substrates serve to reduce the classical proton transfer barriers within the overlayers and, in analogy to ice under high pressure, to shorten the corresponding intermolecular hydrogen bonds. Depending on the sub...