Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Terahertz Spintronics

MA 21.11: Talk

Wednesday, September 7, 2022, 12:00–12:15, H43

Ultrafast coherent THz lattice dynamics coupled to spins in a van der Waals antiferromagnetic flake — •Fabian Mertens¹, David Mönkebüscher¹, Eugenio Coronado², Samuel Mañas-Valero², Carla Boix-Constant², Alberta Bonanni³, Margherita Matzer³, Rajdeep Adhikari³, Alexandra M. Kalashnikova⁴, Umut Parlak¹, Davide Bossini^{1, 5}, and Mirko Cinchetti¹ — ¹Department of Physics, TU Dortmund University, Otto-Hahn-Straße 4, 44227 Dortmund, Germany — ²Instituto de Ciencia Molecular (ICMol) Universidad de Valencia, Spain — ³Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Austria — ⁴alexandra.kalashnikova@gmail.com — ⁵Department of Physics and Center for Applied Photonics, University of Konstanz, Germany

We used the setup described in [1] to study the laser driven lattice and spin dynamics of a 380 nm thick flake of the antiferromagnetic van der Waals semiconductor FePS₃ as a function of excitation photon energy and sample temperature. We found evidence of a coherent optical lattice mode at a frequency of 3.2 THz. The amplitude of the phononic signal vanishes as the phase transition to the paramagnetic phase occurs, revealing its close connection to the long-range magnetic order. These findings open a pathway towards the coherent manipulation of the magneto-crystalline anisotropy in a van der Waals antiferromagnet, scalable down to thinner flakes.
[1] F. Mertens et al., Review of Scientific Instruments 91 (2020)