Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Poster: Electronic Structure of Surfaces and Spectroscopy of Surface States
O 37.1: Poster
Dienstag, 19. März 2024, 18:00–20:00, Poster D
iMott - imaging spin detector based on Mott scattering for SARPES — •Dmitry A. Usanov1, J. Hugo Dil1,2, and Vladimir N. Strocov1 — 1Spectroscopy of Quantum Materials group, Paul Scherrer Institut, Villigen CH-5232, Switzerland — 2Institut de Physique, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
The electron spin is the crucial parameter of modern spintronics and therefore its determination in energy structures of solids is highly important. In order to boost spin-resolved ARPES' efficiency and accessibility, a prototype of a new imaging-type multichannel spin detector for electrons based on Mott scattering (nicknamed iMott) is being developed. The presentation will be focused on two main aspects: first, high stability and excellent image transfer will be demonstrated; second, the algorithms of signal acquisition and processing will be discussed. Two possible operation regimes, namely, the accumulating and single-electron counting modes, will be compared in conjunction with intensity and signal-to-noise ratio requirements, which determine reliable detection of spin asymmetry. The energy resolution of the multichannel detectors and the whole polarimeter will be shown and discussed. Further development directions will be outlined.
Keywords: spin-resolved ARPES; Mott scattering; photoemission spectroscopy; electron spin polarimetry