Affiliation
LNCMI-Grenoble, CNRS, France
Title
Magnons, magnon polarons and spin-entangled optical resonances in semiconducting van der Waals antiferromagnets
Abstract
Two-dimensional materials beyond graphene constitute an exceptional platform for the exploration of the unique electronic, optical, and magnetic properties of low-dimensional systems. Among currently studied materials are layered, van der Waals magnets which include a family of metal phosphorus trichalcogenides (MPX3, with M = Mn, Fe, Co, Ni and X = S, Se). MPX3 compounds are semiconducting antiferromagnets with diverse configurations of the ordering of spins of transition metal ions.
The results of magneto-spectroscopy studies (Raman scattering, far- and near-infrared optics) of two, representative, FePS3 and NiPS3, layered antiferromagnets, with, correspondingly, out-of-plane and in-plane alignment of magnetic ions will be presented. Coupling of magnon-gap excitations with phonon modes will be demonstrated in FePS3 and the properties of the observed magnon polaron modes will be discussed [1]. A non-trivial pattern of magnon-gap excitations in NiPS3 will be elucidated and the origin of the intriguing spin-entangled optical transition observed in this material will be discussed [2].
1. Magnon-polarons in van der Waals antiferromagnet FePS3,
D. Vaclavkova, M. Palit, J. Wyzula, S. Ghosh, A. Delhomme, S. Maity, P. Kapuscinski, A. Ghosh, M. Veis, M. Grzeszczyk, C. Faugeras, M. Orlita, S. Datta, M. Potemski
Phys. Rev. B 104, 134437 (2021).
2. Magnon gap excitations and spin-entangled optical transition in van der Waals antiferromagnet NiPS3
Dipankar Jana, P. Kapuscinski, I. Mohelsky, D. Vaclavkova, I. Breslavetz, M. Orlita, C. Faugeras, M. Potemski
arXiv:2306.07660 [cond-mat.mes-hall].