Doping-control of excitons and magnetism in (..) | Farsane Tabataba-Vakili (LMU & TU Braunschweig)

▶Title: Doping-control of excitons and magnetism in few-layer CrSBr
▶Speaker: Farsane Tabataba-Vakili (LMU & TU Braunschweig)
▶Abstract:
In two-dimensional (2D) magnets, phenomena distinct from bulk magnetism have been revealed, such as sensitivity to charge doping and electric field in few-layer CrI3 [1]. Within the class of 2D magnets, air-stable CrSBr stands out as an antiferromagnetic semiconductor with a high Néel temperature, excitons coupled to the magnetic order [2], and exciton-magnon coupling [3]. In this talk, I will present our work on doping-control of excitons and magnetism in few-layer CrSBr [4]. We demonstrate that both exciton and magnetic transitions are sensitive to field-effect charging, exhibiting bound exciton-charge complexes and doping-induced metamagnetic transitions. We further visualize magnetic domain formation induced by magnetic field or charge-doping at the metamagnetic transition all-optically by raster-scan reflectance imaging. Our work identifies few-layer CrSBr as a rich platform for exploring collaborative effects of charge, optical excitations, and magnetism.
[1] S. Jiang et al., Nat. Nanotechnol. 13, 549 (2018).
[2] N. Wilson et al., Nat. Materials 20, 1657 (2021).
[3] Y. J. Bae et al., Nature 609, 282 (2022).
[4] F. Tabataba-Vakili et al., Nat. Commun. 15, 4735 (2024).

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