Scanning tunneling microscope image of the topography of Pb islands on a Cu(111) surface.

From the article:

Local Measurement of the Eliashberg Function of Pb Islands: Enhancement of Electron-Phonon Coupling by Quantum Well States
Michael Schackert, Tobias Märkl, Jasmin Jandke, Martin Hölzer, Sergey Ostanin, Eberhard K. U. Gross, Arthur Ernst, and Wulf Wulfhekel
Phys. Rev. Lett. 114, 047002 (2015)

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