Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 100: Electronic Structure of Surfaces: Spectroscopy, Surface States II
O 100.6: Talk
Thursday, March 23, 2017, 17:15–17:30, WIL C307
Strain–induced surface state shift on Ag(111) and Ag/Fe(110) — •Schmitt Martin, Kemmer Jeannette, and Bode Matthias — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
The surface electronic properties of both, pristine Ag(111) as well as Ag films grown on various substrates, are well studied. Especially the spectroscopic fingerprint of the L-gap Shockley-type surface state (SS) is commonly used for calibration purposes. While the SS onset is energetically located at ESS = −65 meV on pristine Ag(111), a depopulation was observed on strongly miscut Ag(111) crystals [1]. Furthermore, thin Ag films grown on Si(111) indicated that the SS onset may also be influenced by strain that occurs around dislocation lines [2,3].
We have investigated in the electronic properties of Ag(111) around screw dislocations found on a pristine single crystal by low temperature scanning tunneling spectroscopy. While the expected electronic properties are confirmed on terraces, strain–induced spatial variations of the SS onset are observed at certain locations around screw dislocations. The structure–electronic property relationship identified on Ag(111) will be used to qualitatively explain the SS pinning of the Ag/Fe(110) epitaxial system.
[1] K. Morgenstern et al., Phys. Rev. Lett. 89, 226801 (2002).
Neuhold and Horn, Phys. Rev. Lett. 78, 1327 (1997).
K. Sawa et al., Phys. Rev. Lett. 104, 016806 (2010).