Parametrically driven THz magnon-pairs: predictions towards ultimately fast and minimally dissipative switching

Abstract

Findings ways to achieve switching between magnetic states at the fastest possible time scale that simultaneously dissipates the least amount of energy is one of the main challenges in magnetism. Antiferromagnets exhibit intrinsic dynamics in the THz regime, the highest among all magnets and are therefore ideal candidates to address this energy-time dilemma. Here we study theoretically THz-driven parametric excitation of antiferromagnetic magnon-pairs at the edge of the Brillouin zone and explore the potential for switching between two stable oscillation states. Using a semi-classical theory, we predict that switching can occur at the femtosecond time scale with an energy dissipation down to a few zepto Joule. This result touches the thermodynamical bound of the Landauer principle, and approaches the quantum speed limit up to 5 orders of magnitude closer than demonstrated with magnetic systems so far.

8 pages, 4 figures

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Cited by in corpus (4)

• Coherent THz Spin Dynamics in Antiferromagnets Beyond the Approximation of the Néel vector
• Spontaneous and impulsive stimulated Raman scattering from two-magnon modes in a cubic antiferromagnet
• Time-dependent Schwinger boson mean-field theory of supermagnonic propagation in 2D antiferromagnets
• Controlled bit-flip of period-doubling and discrete time crystalline states in open systems