Adlayer influence on Dirac-type surface state at W(110)

P J Grenz; D Thonig; M Holtmann; K Miyamoto; S Kumar; E Schwier; T Okuda; J Henk; M Donath

doi:10.1088/1361-648X/abfdf3

Adlayer influence on Dirac-type surface state at W(110)

J Phys Condens Matter. 2021 Jun 3;33(28). doi: 10.1088/1361-648X/abfdf3.

Authors

P J Grenz¹, D Thonig^{2

3}, M Holtmann¹, K Miyamoto⁴, S Kumar⁴, E Schwier⁴, T Okuda⁴, J Henk⁵, M Donath¹

Affiliations

¹ Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany.
² Department of Physics and Astronomy, Material Theory, University Uppsala, Box 516, 75120 Uppsala, Sweden.
³ School of Science and Technology, Örebro University, 701 82 Örebro, Sweden.
⁴ Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan.
⁵ Institute of Physics, Martin Luther University Halle-Wittenberg, 06099 Halle, Saale, Germany.

PMID: 33946058
DOI: 10.1088/1361-648X/abfdf3

Abstract

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. In order to identify the origin of the energy shift we performed first-principles 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 change the surface potential, which results in an additional energy shift of the DSS.

Keywords: ARPES; Dirac-type surface state; W(110); surface electronic structure; thin films.

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