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

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

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

We use scanning tunneling microscopy and spectroscopy to measure the energy shift of empty quantum-well (QW) states in Pb islands on the Cu(111) surface. It is found that, with an increase of the electric field, the behavior of the energy shift can be grouped into two different modes for most QW states. In the first mode, the state energy moves toward high energy monotonically. In the second mo...

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...

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...

Link between adatom resonances and the Cu(111) Shockley surface state.

Low-temperature scanning tunneling microscopy and spectroscopy at 7 K was used to assemble and characterize native adatom islands of successive size on the Cu(111) surface. Starting from the single adatom we observe the formation of a series of quantum states which merge into the well known two-dimensional Shockley surface state in the limit of large islands. Our experiments reveal a natural ph...