Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 8: Surface State Spectroscopy I
O 8.7: Vortrag
Montag, 7. März 2016, 12:15–12:30, H4
Edge states at vacancy islands on pristine Ni(111) — •Martin Schmitt1, Jeannette Kemmer1, Matthias Vogt1, Matthias Bode1, Mara Gutzeit2, Paolo Ferriani2, and Stefan Heinze2 — 1Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Institut für Theoretische Physik und Astrophysik, Christian-Albrechts Universität zu Kiel, Leibnizstr. 15, 24098 Kiel, Germany
Recently, the dispersion relations of surface electronic states of pristine Ni(111)
has been probed by quasiparticle interference (QPI) [1].
In agreement with earlier inverse photoemission experiments [2]
an exchange-split and upward dispersing Shockley-type sp-derived surface state was observed.
In a follow-up investigation we have studied the electronic properties
of step edges surrounding hexagonally shaped vacancy islands
by means of low-temperature scanning tunneling spectroscopy.
Our results indicate that A- or B-steps are markedly different.
While one type of step edge is essentially featureless,
local tunneling spectra measured on the other exhibit an additional peak.
By comparison with density functional theory calculations we discuss
if this peak can potentially be interpreted as a one-dimensional edge state.
A. Krönlein et al., Phys. Rev. B 89, 155413 (2014).
M. Donath et al., Phys. Rev. Lett. 70, 2802 (1993).