Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 73: Electronic Structure of Surfaces 1

O 73.4: Talk

Thursday, September 8, 2022, 15:45–16:00, S053

Electronic structure of a square Te adlayer on Au(100) surface — •Begmuhammet Geldiyev¹, Tilman Kißlinger², Philipp Eck³, Maximilian Ünzelmann¹, Tim Figgemeier¹, Jakub Schusser¹, Nikolai Tezak¹, Lutz Hammer², M. Alexander Schneider², Domenico Di Sante³, Giorgio Sangiovanni³, Hendrik Bentmann¹, and Friedrich Reinert¹ — ¹Experimentelle Physik 7 and Cluster of Excellence ct.qmat, Universität Würzburg — ²Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg — ³Institut für Theoretische Physik und Astrophysik and Cluster of Excellence ct.qmat, Universität Würzburg

In light of several theoretical predictions regarding the so-called square tellurene [1, 2], the growth and the electronic structure of Te deposited on a Au(100) surface is reported. At a coverage of 1/4 monolayer, Te forms a p(2×2) square lattice of adatoms on Au(100) as determined by a thorough LEED-IV characterization (R_P = 0.085) and STM. Utilizing angle-resolved photoemission spectroscopy and density functional theory an interface-like state with mixed Te p_x,y and Au d orbital character is identified in addition to a complex multitude of backfolded bands of the substrate. Vastly differing Rashba parameters along the XG and XM lines cannot be explained within an (anisotropic) Rashba picture. The spin splitting rather depends on the momentum space texture of the atomic orbitals. Our work may stimulate further experimental explorations of symmetry and topology effects in 2D square-lattice systems. [1] Xian et al., 2D Mater. 4, 041003, (2017)

[2] Zhang et al., Phys. Rev. B 98, 115411, (2018)