Probing many-body scattering in Cu(111) via FT-STS: Understanding local perturbations from the collective signatures of a 2D electron gas

ORAL

Abstract

Surface states of close-packed noble metals provide one of the simplest scenarios for studying many-body scattering in two dimensions, turning them into a relatively simple platform to test novel spectroscopic techniques. In this talk I will present a study of the Cu(111) surface state with high-resolution Fourier Transform Scanning Tunnelling Spectroscopy (FT-STS), and for the first time demonstrate that the QPI lineshape can be quantitatively fit using many-body effects within the T-matrix formalism. Specifically, the self-energies and the scattering phase-shifts are quantified for both the occupied and unoccupied states, further expanding the capabilities of FT-STS beyond its conventional application as merely a probe of the energy dispersion in scattering space.

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Presenters

  • Gelareh Farahi

    • Physics, Princeton University

Authors

  • Gelareh Farahi

    • Physics, Princeton University

  • Steven Johnston

    • Univ. of Tennessee
    • Univ of Tennessee
    • Physics, Univ of Tennessee, Knoxville
    • Physics and Astronomy, University of Tennessee
    • Department of Physics and Astronomy, University of Tennessee
    • Physics, Univ. of Tennessee
    • physics and astronomy, University of Tennessee
    • Department of Physics and Astronomy, Univ of Tennessee, Knoxville

  • Sarah Burke

    • Physics and Astronomy, University of British Columbia

  • Doug Bonn

    • University of British Columbia
    • Physics and Astronomy, University of British Columbia
    • Department of Physics and Astronomy, University of British Columbia