Field-induced expansion deformation in Pb islands on Cu(111): evidence from energy shift of empty quantum-well states.

Phase contribution of image potential on empty quantum well States in pb islands on the cu(111) surface.

We use scanning tunneling spectroscopy to explore the quantum well states in the Pb islands grown on a Cu(111) surface. Our observation demonstrates that the empty quantum well states, whose energy levels lie beyond 1.2 eV above the Fermi level, are significantly affected by the image potential. As the quantum number increases, the energy separation between adjacent states is shrinking rather t...

Comment on "Phase contribution of image potential on empty quantum well states in Pb islands on the Cu(111) surface".

Local measurement of the Eliashberg function of Pb islands: enhancement of electron-phonon coupling by quantum well states.

Inelastic tunneling spectroscopy of Pb islands on Cu(111) obtained by scanning tunneling microscopy below 1 K provides a direct access to the local Eliashberg function of the islands with high energy resolution. The Eliashberg function describes the electron-phonon interaction causing conventional superconductivity. The measured Eliashberg function strongly depends on the local thickness of the...

Self-organization of Pb thin films on Cu(111) induced by quantum size effects

Electron confinement in thin films of Pb on Cu(111) leads to the formation of quantum well states, formed out of the upper valence band of Pb. Their evolution as a function of film thickness is characterized in angle-resolved photoemission and can be interpreted in terms of a straightforward quantum well model. This permits an identification of film growth mode at low temperatures. Bringing the...

Magic heights in Pb nanodots induced by Quantum Size Effects

The search for methods to produce structures highly organized at the atomic scale during epitaxy is an active research area since it holds the promise for basic discoveries and novel technological applications. Along with the well known kinetic and thermodynamic parameters, it was recently found that Quantum Size Effects can play a crucial role during epitaxial growth [1-3]. For instance, metal...