Speaker
Description
Low-energy collective excitations, such as phonons and magnons, are essential for understanding physics across a wide range of time and length scales. Energy flow among correlated subsystems, mediated by these collective excitations, is essential for ultrafast dynamics and high-speed technologies. Yet momentum-resolved access to low-energy magnons in non-equilibrium states has been lacking. In this talk, I will present a new technique, time-resolved resonant diffuse scattering, developed to close this gap. By combining complementary time-resolved X-ray techniques that elucidate the dynamics of the long-range antiferromagnetic state and low-energy phonons, as well as quantum-kinetic simulations, we unveil hierarchical energy pathways in the photoexcited antiferromagnet CuO [1]. The established microscopic framework, beyond phenomenological models, that should be applicable to other correlated materials.
References
[1] A. Romaguera, H. Ueda et al., arXiv: 2602.13113.