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Probing many-body scattering in Cu(111) via FT-STS : understanding local perturbations from the collective signatures of a 2D electron gas Farahi, Gelareh
Abstract
Surface states of close-packed noble metals form an approximate two-dimensional electron gas whose many-body signatures can be locally probed using a scanning tunneling microscope (STM). In this work I present a study of the Cu(111) surface state with high-resolution Fourier Transform Scanning Tunneling Spectroscopy (FT-STS), and for the first time demonstrate that the energy dispersion and quasi-particle lifetime of the surface states can be accurately quantified in both the occupied and unoccupied states. The scat-tering phase-shift imposed by defect potentials is then extracted in Fourier space, which is consistent with previous real space analyses. This result is later used in the T-matrix simulation of the density of states that gives an accurate description of our data. Finally, I report that in dilute Co/Cu(111) where the absence of time-reversal symmetry allows for spin-flip scattering, spin-conserving scattering dominates the FT-STS signal.
Item Metadata
Title |
Probing many-body scattering in Cu(111) via FT-STS : understanding local perturbations from the collective signatures of a 2D electron gas
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2017
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Description |
Surface states of close-packed noble metals form an approximate two-dimensional electron gas whose many-body signatures can be locally probed using a scanning tunneling microscope (STM). In this work I present a study of the Cu(111) surface state with high-resolution Fourier Transform Scanning Tunneling Spectroscopy (FT-STS), and for the first time demonstrate that the energy dispersion and quasi-particle lifetime of the surface states can be accurately quantified in both the occupied and unoccupied states. The scat-tering phase-shift imposed by defect potentials is then extracted in Fourier space, which is consistent with previous real space analyses. This result is
later used in the T-matrix simulation of the density of states that gives an accurate description of our data. Finally, I report that in dilute Co/Cu(111) where the absence of time-reversal symmetry allows for spin-flip scattering, spin-conserving scattering dominates the FT-STS signal.
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Genre | |
Type | |
Language |
eng
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Date Available |
2017-08-31
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0355242
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2017-11
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Campus | |
Scholarly Level |
Graduate
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Rights URI | |
Aggregated Source Repository |
DSpace
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Rights
Attribution-NonCommercial-NoDerivatives 4.0 International