Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Ultrafast Magnetization II

MA 21.1: Talk

Tuesday, March 17, 2020, 09:30–09:45, HSZ 101

Ultrafast control of spin-spin interactions 2D antiferromagnetic layers — •Alireza Qaiumzadeh — Center for Quantum Spintronics, Norwegian University of Science and Technology

Light enables the ultrafast, direct, and nonthermal control of the spin-spin interactions.

In this work, we consider two types of antiferromagnetic systems: 1. A 2D honeycomb lattice antiferromagnetic spin-orbit Mott insulator, and 2. A 2D metallic Rashba antiferromagnetic system.

Based on the Floquet theory and time-dependent perturbation theory, we demonstrate that by changing the amplitude and frequency of polarized laser pulses, one can tune the amplitudes and signs of and even the ratio between the exchange and Dzyaloshinskii-Moriya spin interactions. Furthermore, the renormalizations of the spin interactions are independent of the helicity. Our results pave the way for ultrafast optical spin manipulation in recently discovered two-dimensional magnetic materials.

[1] J. M. Losada, A. Brataas, and A. Qaiumzadeh, Phys. Rev. B 100, 060410(R) (2019). [2] S. Ø. Hanslin, A. Brataas, and A. Qaiumzadeh, to be submitted (2020).