Inverse Rashba Edelstein THz emission modulation induced by ferroelectricity in CoFeB/PtSe2/MoSe2//LiNbO3 systems
Résumé
Spintronic terahertz emitters, based on optically triggered spin-to-charge conversion processes, have recently emerged as a novel route toward compact and efficient THz sources. The next challenge for technologically relevant devices, however, remains to modulate the emission with low-energy consumption during operation. In order to achieve this, ferroelectric materials coupled to active spin–orbit layers such as two-dimensional transition metal dichalcogenides are potential candidates. In this work, we present the realization of a large area heterostructure of CoFeB/PtSe2/MoSe2//LiNbO3 on a macroscopically bidomain LiNbO3 substrate. Using THz time-domain spectroscopy, we show that the ferroelectric polarization direction induces a sizable modulation of the THz emission. We rationalize these experimental results by using band structure and spin accumulation calculations that are consistent with an interfacial spin-to-charge conversion mediated by the inverse Rashba–Edelstein effect at the MoSe2/PtSe2 interface and being tuned by ferroelectricity in the adjacent LiNbO3 surface. This work demonstrates the relevance and technological potential of field effect spin–orbit architectures for novel THz technologies.
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Cite 10.60893/figshare.apm.28609043.v1 Jeu de données Massabeau, S., Paull, O., Pezo, A., Miljevic, F., Micica, M., Grisard, A., Morfin, P., Lebrun, R., Jaffres, H., Dhillon, S. S., George, J.-M., Jamet, M., & Bibes, M. (2025). Supplementray I, II, III, IV, V [Data set]. AIP Publishing. https://doi.org/10.60893/FIGSHARE.APM.28609043.V1