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

TL;DR

This paper theoretically predicts that THz-driven parametric excitation of antiferromagnetic magnon-pairs can enable ultrafast, minimally dissipative switching between magnetic states, approaching fundamental thermodynamic and quantum limits.

Contribution

It introduces a semi-classical model predicting femtosecond switching with extremely low energy dissipation in antiferromagnets, advancing magnetic switching technology.

Findings

Switching occurs at femtosecond timescales.

Energy dissipation can be as low as a few zepto Joules.

Approaches thermodynamic and quantum speed limits.

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.