title: Local measurement of the Eliashberg function of Pb islands: enhancement of electron-phonon coupling by quantum well states.
abstract: 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 Pb nanostructures and shows a sharp maximum when quantum well states of the Pb islands come close to the Fermi energy. Ab initio calculations reveal that this is related to enhanced electron-phonon coupling at these thicknesses.
authors: Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany.
authors: Michael
authors: M
authors: Schackert
authors: Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany.
authors: Tobias
authors: T
authors: Märkl
authors: Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany.
authors: Jasmin
authors: J
authors: Jandke
authors: Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany.
authors: Martin
authors: M
authors: Hölzer
authors: Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany.
authors: Sergey
authors: S
authors: Ostanin
authors: Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany.
authors: Eberhard K U
authors: EK
authors: Gross
authors: Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany and Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstraße 2, 04103 Leipzig, Germany.
authors: Arthur
authors: A
authors: Ernst
authors: Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany.
authors: Wulf
authors: W
authors: Wulfhekel
mesh_terms: D003300:Copper / Q000737:chemistry; D004583:Electrons; D007854:Lead / Q000737:chemistry*; D016252:Microscopy, Scanning Tunneling / Q000379:methods; D008962:Models, Theoretical; D060739:Phonons; D011789:Quantum Theory
chemical_list: D007854:Lead; D003300:Copper