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DOI: 10.1103/PhysRevLett.114.047002
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Zitationen: 16
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Zitationen: 15

Local Measurement of the Eliashberg Function of Pb Islands: Enhancement of Electron-Phonon Coupling by Quantum Well States

Schackert, Michael; Maerkl, Tobias; Jandke, Jasmin; Hoelzer, Martin; Ostanin, Sergey; Gross, Eberhard K. U.; Ernst, Arthur; Wulfhekel, Wulf

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.


Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 0031-9007
KITopen ID: 1000054660
Erschienen in Physical Review Letters
Band 114
Heft 4
Seiten 047002
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