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O: Fachverband Oberflächenphysik
O 11: Electronic Structure of Surfaces: Spectroscopy, Surface States I
O 11.9: Vortrag
Montag, 17. März 2025, 17:00–17:15, H4
Surface electronic structure of Te chains on Au(100) via ARPES — •Begmuhammet Geldiyev1, Maximilian Ünzelmann1, Tim Figgemeier1, Hendrik Bentmann2, and Friedrich Reinert1 — 1Experimentelle Physik 7 and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg — 2Center for Quantum Spintronics, Department of Physics, NTNU, Norway
In this talk, we will provide a comprehensive description of the surface electronic band structure in epitaxial Te chains grown in the submonolayer regime on a Au(100) substrate. First, the deposition of 0.25 ML Te results in an adlayer square lattice superstructure with p (2 × 2) periodicity. Particularly, the band structure of this system features an interface state – derived from hybrid Te-Au orbitals – that exhibits an anisotropic spin and orbital Rashba effect [1]. Second, by slightly increasing the Te coverage to 0.30 ML, the earlier square arrangement evolves into a chain structure with c (10 × 2) periodicity [2]. Here, we will address whether the latter system inherits an analogous Rashba effect scenario. Furthermore, we will unravel a flat electronic band with a bandwidth of ≈ 20 meV, indicating an almost perfect one-dimensional character.
[1] B. Geldiyev et al., Phys. Rev. B 108, L121107 (2023)
[2] L. Hammer et al., Surf. Sci. 750, 122589 (2024)
Keywords: Rashba effect; ARPES; flat band