Electron relaxation in empty quantum-well states of a Pb island on Cu(111) studied by Z-V (distance-voltage) spectroscopy in scanning tunneling microscopy

S. M. Lu, W. B. Su, Chun-Liang Lin, W. Y. Chan, H. L. Hsiao, C. S. Chang, Tien T. Tsong

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Abstract

We use the Z-V (distance-voltage) spectroscopy in scanning tunneling microscopy to detect the linewidths of empty quantum-well (QW) states acquired from a Pb island grown on the Cu(111) substrate. It is found that the continual broadening of the linewidth can extend to the electronic states near the vacuum level. We apply the Fermi-liquid theory with the Fabry-Ṕrot mode to analyze the linewidths of the QW states, and obtain the electron-phonon coupling constant, the electron-electron coupling factor, and the product of the electron reflectivities at the surface and interface of the Pb island.

Original languageEnglish
Article number083707
JournalJournal of Applied Physics
Volume108
Issue number8
DOIs
StatePublished - 15 Oct 2010

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