Femtosecond quantum magnonics in a nonlinear regime far from equilibrium (B07)

• Subject Area: Experimental Condensed Matter Physics
• Term: since 2022
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 425217212

The resonant pumping of high-energy magnons leads to the renormalization of the magnetic spectrum and spin Hamiltonian. In the forthcoming funding period, we aim to delve into the microscopic mechanism underlying this phenomenon, focusing on a hitherto unexplored magnetic ground state. A quantum mechanical description of the absorption of light by zone-edge magnons reveal the process to be tightly related to vacuum fluctuations. We will perform a temporally- and spectrally-resolved investigation of the non-equilibrium photoinduced dynamics of the relevant absorption line, even detecting the electric-field-resolved emission of the dipole associated with high-energy magnons. Our experimental efforts, combined with the modelling from theorists, will result in identifying the spectroscopic fingerprints of quantum fluctuations in non-equilibrium dynamics of high-energy magnons.

• DFG Programme: Collaborative Research Centres
• Subproject of: SFB 1432: Fluctuations and Nonlinearities in Classical and Quantum Matter beyond Equilibrium
• Applicant Institution: Universität Konstanz
• Project Head: Dr. Davide Bossini