Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 37: Poster: Electronic Structure of Surfaces and Spectroscopy of Surface States
O 37.10: Poster
Tuesday, March 19, 2024, 18:00–20:00, Poster D
Model for Linear and Circular Dichroism in Angle-Resolved Photoemission Spectroscopy — •Maximilian Ünzelmann1, Noah Endres1, Begmuhammet Geldiyev1, Jakub Schusser1, Hendrik Bentmann2, and Friedrich Reinert1 — 1Experimentelle Physik 7 and Würzburg-DresdenCluster of Excellence ct.qmat, Universität Würzburg — 2Center for Quantum Spintronics, Department of Physics, NTNU, Norway
Angle-resolved photoemission spectroscopy (ARPES) in combination with linear and circular dichroism (LD and CD) has evolved as a powerful tool to study spin-split electronic states in solids including, e.g., Rashba systems [1,2] or Weyl semimetals [3]. In particular, the combination of spin-orbit coupling (SOC) and inversion symmetry breaking (ISB) leads to the formation of spin- and orbital angular momentum (OAM) in the electronic wave functions. Here, we show – using a simple model for the photoemission matrix element – that both LD and CD are sensitive to the OAM in the initial state wave function. We apply our model to the eigenstates obtained from tight-binding band structure calculations. On this basis, the influence of (i) experimental parameters and (ii) properties of the initial state on the dichroic signal will be discussed. Finally, we show that those model calculations compare nicely with real experimental data on various types of material systems.
[1] H. Bentmann et al., Phys. Rev. Lett. 119, 106401 (2017)
[2] M. Ünzelmann et al., Phys. Rev. Lett. 124, 176401 (2020)
[3] M. Ünzelmann et al., Nat. Commun., 12, 3650 (2021)
Keywords: Dichroism; ARPES; Orbital Angular Momentum; Rashba Effect; Surface States