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MA: Fachverband Magnetismus

MA 2: Computational Magnetism I

MA 2.3: Vortrag

Montag, 18. März 2024, 10:00–10:15, H 1058

T-symmetric second order optical responses in noncollinear AFMs — •Javier Sivianes¹, Flaviano José Dos Santos², and Julen Ibañez-Azpiroz^1,3,4 — ¹Centro de Física de Materiales, UPV, Donostia — ²Theory and Simulation of Materials (THEOS), and National Centre for Computational Design and Discovery of Novel Materials (MARVEL) — ³Ikerbasque Foundation, Bilbao, Spain — ⁴Donostia International Physics Center (DIPC), Donostia, Spain

There is a growing interest in Mn₅Si₃, a compound that exhibits altermagnet and noncollinear AFM phases [1]. The latter presents a peculiar feature; its atomic positions belong to the centrosymmetric 6/mmm point group while its magnetic point group 11′ lacks inversion symmetry. Notably, this allows for finite second order optical responses to take place such as the shift and injection currents or the nonlinear Hall effect.

In this work we report DFT calculations on the quadratic optical properties of noncollinear Mn₅Si₃, which reach a substantial magnitude comparable to ferroelectric materials. In order to gain insight into the role of the magnetic structure in the nonlinear charge flow, we build a double-exchange tight-binding model. The nonlinear optical signature could be employed to distinguish among the various suggested magnetic structures of the material [1].

[1] N. Biniskos. et al., Phys. Rev. B 105, 104404 (2022).

Funding provided by the European Union’s Horizon 2020 research and innovation programme under the European Research Council (ERC) grant agreement No 946629.

Keywords: Noncollinear AFM; Second order optical response