Fermi Surfaces of Surface States on Si(111) + Ag, Au
J. N. Crain (1), K. N. Altmann (1), Ch. Bromberger (2), and F. J., Himpsel (1) ((1) Department of Physics, University of Wisconsin - Madison,, (2) Department of Physics, Philipps - University, Marburg, Germany)
TL;DR
This study uses angle-resolved photoemission to analyze the Fermi surfaces, group velocities, and effective masses of surface states on Si(111) with Ag and Au, revealing complex electronic structures and interactions.
Contribution
It provides detailed experimental characterization of surface state Fermi surfaces on Si(111) with Ag and Au, including the effects of superlattice structures and umklapp patterns.
Findings
Fermi surface of Si(111)sqrt3x sqrt3-Ag has small electron pockets.
Au incorporation creates a new metallic band.
Superlattice induces minigaps of 110 meV and interaction potential of 55 meV.
Abstract
Metallic surface states on semiconducting substrates provide an opportunity to study low-dimensional electrons decoupled from the bulk. Angle resolved photoemission is used to determine the Fermi surface, group velocity, and effective mass for surface states on Si(111)sqrt3xsqrt3-Ag, Si(111)sqrt3x sqrt3-Au, and Si(111)sqrt21xsqrt21-(Ag+Au). For Si(111)sqrt3xsqrt3-Ag the Fermi surface consists of small electron pockets populated by electrons from a few percent excess Ag. For Si(111)sqrt21xsqrt21-(Ag+Au) the added Au forms a new, metallic band. The sqrt21xsqrt21 superlattice leads to an intricate surface umklapp pattern and to minigaps of 110 meV, giving an interaction potential of 55 meV for the sqrt21xsqrt21 superlattice.
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