Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 94: 2D Materials V: Novel Systems
O 94.1: Talk
Friday, April 5, 2019, 10:30–10:45, H9
Orbital texture in the band structure of a new binary honeycomb lattice AgTe — •Maximilian Ünzelmann1, Hendrik Bentmann1, Tilman Kißlinger2, Lutz Hammer2, M. Alexander Schneider2, Thomas Fauster2, Philipp Eck3, Domenico Di Sante3, Giorgio Sangiovanni3, and Friedrich Reinert1 — 1Experimentelle Physik 7, Universität Würzburg — 2Lst. f. Festkörperphysik, Universität Erlangen-Nürnberg — 3Theoretische Physik 1, Universität Würzburg
In recent years two-dimensional (2D) materials like honeycomb-structured thin films or transition metal dichalcogenides attracted a lot of attention in solid state physics. Lattice symmetry as well as strong spin-orbit coupling leads to phenomena like non-trivial band topology (1,2). Therefore it is important to gain knowledge about the orbital character of the involved valance-state wave functions.
Here we will present a new binary honeycomb lattice namely AgTe, whose structure is realized on a Ag(111)-substrate. Using angle-resolved photoemission we will determine the 2D band structure of the AgTe layer. By means of light-polarization dependent measurements, anisotropies in the band dispersion and linear dichroism we analyze the orbital character of the valence bands. Based on the determined orbital symmetry we discuss a possible topological band inversion in AgTe.
(1) F. Reis et al., Science 357, 287 (2017)
(2) S. Tang et al., Nature Physics 13, 683 (2017)