3rd SmoleQ Greeting Seminar (2024.12.18 at 17:00 (JST))

 

Speaker: 

Dmitrii A. Usanov

List of contributors along with their affiliations:

D. A. Usanov1, V. N. Petrov2, J. H. Dil1, 3, V. N. Strocov1

1 Spectroscopy of Quantum Materials group, Paul Scherrer Institut, Villigen CH-5232, Switzerland

2 St Petersburg Polytechnical University, Polytechnicheskaya Str. 29, St Petersburg RU-195251, Russian Federation

3 Institut de Physique, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland

Title: 

Imaging electron optics for multichannel Mott polarimetry

Abstract:

The electron spin is a crucial parameter in modern spintronics, making its determination in the energy structures of solids highly significant. To improve the efficiency and accessibility of spin-resolved ARPES, a prototype of a new imaging-type multichannel spin detector for electrons, based on Mott scattering (nicknamed iMott), is being developed [1, 2, 3]. This presentation will focus on several key aspects. First, we will demonstrate the detector's high stability and excellent image transfer capabilities. Second, the advantages of direct electron detection will be highlighted. Third, we will discuss algorithms for signal acquisition and processing. Two possible operation regimes—"accumulating" and "counting" modes—will be compared in terms of intensity and signal-to-noise ratio requirements, which are critical for reliable spin asymmetry detection. A detailed analysis for decoupling instrumental asymmetries from spin polarization, specific for iMott’s geometry, will be presented. Finally, we will present and discuss the energy resolution of the detectors and the overall polarimeter, along with outlining directions for further development.

References:

[1] V. N. Strocov, V. N. Petrov, J. H. Dil // J. Synchro-tron Rad. 22, 708-716 (2015).

[2] Petrov, V. N., Gabdullin, P. G., Pavlov, A. V., et al. // Proceedings of the XXV Nanophysics and Nanoelectronics. Nizhny Novgorod (2020).

[3] Petrov V., Gabdullin P., Pavlov A., Ustinov A, .Strocov V., Dil H, // Projecting classical Mott polarimeter // St. Petersburg Polytechnic University Journal: Physics and Mathematics 14(3) 187 (2021)