2017/10/31 by D. Bossini, Davide Bossini, Stefano Dal Conte +16
Engineering · Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Electron #Excitation #Femtosecond #Ferromagnetism #Laser #Magnetic properties of thin films #Magneto-Optical Properties and Applications #Magnon #Magnonics #Mechanical and Optical Resonators #Physics #Quantum mechanics #Spin polarization #Spin wave #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.100.024428
published as Phys. Rev. B 100, 024428 (2019) · 25 pages, 10 figures
openalex created_date 2018/10/26 · arxiv created 2019/07/08 · openalex publication_date 2019/07/25 · arxiv updated 2019/07/31 · openalex updated_date 2026/08/05
Ultrashort laser pulses can induce picosecond coherent spin precession, described in terms of classical Landau-Lifshitz equations of motion. In antiferromagnets, the optical generation of pairs of high-energy magnons results in coherent 20-THz longitudinal spin oscillations. In a joint theoretical and experimental effort, the authors analyze here this controversial dynamical regime, investigating the dependence of spin dynamics on several parameters, such as temperature, polarization, and fluence. The derivation of an adequate equation of motion requires a quantum mechanical treatment, which predicts also entanglement between the pairs of photogenerated magnons.