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MA: Fachverband Magnetismus

MA 7: Poster Magnetism I

MA 7.18: Poster

Montag, 9. März 2026, 09:30–12:30, P2

Magnetization-dependent electronic structure and ultrafast electron dynamics in CrGeTe3 — •Tulio de Castro¹, Samuel Beaulieu¹, Shuo Dong¹, Maciej Dendzik¹, Tommaso Pincelli², Lawson Lloyd Lloyd², Ralph Ernstorfer², Martin Wolf¹, and Laurenz Rettig¹ — ¹Fritz-Harber-Institut der Max-Planck-Gesellschaft, Berlin — ²I0AP, Technische Universität Berlin, Berlin.

Magnetic 2D van-der-Waals materials offer novel opportunities for spin-based nanodevices, with advantages over charge-based technologies. One promising material is the semiconductor CrGeTe3 (CGT), which exhibits ferromagnetic order below the Curie temperature(TC=63 K). Here, we investigate bulk CGT using femtosecond time and angle-resolved photoemission spectroscopy(trARPES), to elucidate how magnetic order modifies the electronic structure, and to directly measure the ultrafast dynamics of exchange splitting and demagnetization. We observe a temperature-dependent shift in band energies below TC, associated with magnetic order. Upon femtosecond optical excitation, we observe an ultrafast renormalization of band energies, which we discuss in terms of transiently modified exchange splitting and superexchange pathways. Our results provide a direct ultrafast timescale for electron redistribution in magnetically ordered CGT, and give insight into the pathways of spin-electron interactions in CGT.

Keywords: CGT; ARPES; Magnetization; spin; exchange