Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 112: Development of Novel Methods I
O 112.3: Talk
Thursday, March 19, 2020, 15:45–16:00, WIL C107
Two-dimensional spin detection with high-resolution laser ARPES based on hemispherical analyzer and exchange scattering spin detector — •Tristan Heider, Claus M. Schneider, and Lukasz Plucinski — FZ Jülich PGI-6, Jülich, Germany
Two existing approaches for measuring 2D spin maps in angle-resolved photoemission are single k-point detectors behind the hemispherical analyzer [1], and 2D spin detectors in combination with momentum microscopes, either with hemispherical [2] or time-of-flight energy filtering (other related concepts exist). Here we describe the setup of the first type based on the A1 hemispherical analyzer with the lens deflection system (MBS AB) with the Ferrum spin detector (Focus GmbH) mounted on a 90-deg deflector. The point-by-point spin scanning is efficient when using the 6eV cw laser excitation (LEOS Solutions), and a typical 50 × 50 pixel 2D spin map can be collected within 10-20 min. The unique advantages are the access to both in-plane and out-of-plane spin components using Ferrum, the negligible instrumental asymmetries, and the access to the energy resolution down to 5 meV in spin. We will discuss several applications, including the high resolution spin-integrated laser-ARPES from Fe-based superconductor, and spin-resolved in-plane and out-of-plane 2D spin-texture from the Bi2Se3-family material. The challenges in data collection of our large 3D ARPES maps will be discussed in a separate talk [3].
[1] L. Plucinski et al. J. Electron Spectroscopy Rel. Phen. 181, 215 (2010) [2] C. Tusche et al., Ultramicroscopy 159, 520 (2015) [3] L. Plucinski et al., this conference