Correlated spin and charge dynamics during ultrafast demagnetization of Ca<sub>2</sub>RuO<sub>4</sub>

The multiband Mott insulator Ca₂RuO₄has recently been reported to host an exotic antiferromagnetic ground state with excitonic character. Using magnetic field dependent time-resolved second harmonic generation polarimetry, we demonstrate an ultrafast photo-doping induced collapse of the antiferromagnetic state in Ca₂RuO₄. Simultaneous transient reflectivity measurements reveal that relaxation pathways of photo-dopants are intimately correlated with the dynamical evolution of the antiferromagnetic order parameter. Possible connections of our observation to the theoretical proposal of excitonic magnetism will be discussed.

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Bulletin of the American Physical Society

2023 APS March Meeting

Volume 68, Number 3

Las Vegas, Nevada (March 5-10)Virtual (March 20-22); Time Zone: Pacific Time

Session K38: Light Induced Structural Control of Electronic Phases II

Abstract: K38.00009 : Correlated spin and charge dynamics during ultrafast demagnetization of Ca2RuO4

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Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time

Abstract: K38.00009 : Correlated spin and charge dynamics during ultrafast demagnetization of Ca₂RuO₄