SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Poster Session V: Electronic structure of surfaces: Spectroscopy, surface states III
O 64.1: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Adlayer influence on Dirac-type surface state at W(110) — •Pascal Jona Grenz1, Danny Thonig2,3, Marcel Holtmann1, Koji Miyamoto4, Shiv Kumar4, Eike Schwier4,5, Taichi Okuda4, Jürgen Henk6, and Markus Donath1 — 1University of Münster, Germany — 2Uppsala University, Sweden — 3Örebro University, Sweden — 4Hiroshima Synchrotron Radiation Center, Japan — 5University of Würzburg, Germany — 6Martin Luther University Halle-Wittenberg, Germany
In a combined experimental and theoretical study, we investigated how Fe and Co adlayers on W(110) affect the Dirac-type surface state (DSS). Angle-resolved photoelectron spectroscopy data show an increase in binding energy of 75 meV and 107 meV for Fe and Co, respectively. To identify the origin of the energy shift, we performed first principle calculations of the surface electronic structure. The inward surface relaxation of the uncovered W(110) surface is lifted by the adlayers. This structural change is one reason of the energy shift of the DSS. Furthermore, the Fe and Co adlayers lead to a reduced charge distribution of the DSS at the vacuum side, which results in an additional energy shift of the DSS.