Strong lateral electron coupling of Pb nanowires on stepped Si(111): Angle-resolved photoemission studies

Keun Su Kim, Harumo Morikawa, Won Hoon Choi, Han Woong Yeom

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We employ angle-resolved photoemission to characterize the electronic band structure of the Pb "nanowire" array self-assembled on a stepped Si(111) surface. Despite the highly oriented nanowires observed in scanning tunneling microscopy images, we find essentially two-dimensional Fermi contours modulated one dimensionally perpendicular to the wires. This strong two-dimensional and quasi-one-dimensional nature of the band structure explains the stability and anisotropy of the metallic phase down to 4 K as reported recently. A simple tight-binding model with each Si nanoterrace covered by a densely packed Pb overlayer successfully reproduces this modulated band structure and quantifies the electron coupling within the " nanostripes" and the step-edge potential.

Original languageEnglish
Article number196804
JournalPhysical Review Letters
Issue number19
Publication statusPublished - 2007 Nov 8


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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