Już 8 maja 2025 roku o godz. 12:30 w Audytorium Aleksandra Jabłońskiego Prof. Richard Matthias Geilhufe (Chalmers University of Technology, Göteborg, Szwecja) wygłosi wykład pt. "Ultrafast Thermodynamics".
Streszczenie:
Materials are composed of a vast number of ions and electrons, arranging themselves in regular patterns. Due to immense progress in ultrafast spectroscopy, ranging from the low-frequency infrared to high-frequency X-ray regimes, collective excitations of charge, spin, lattice, and orbital degrees of freedom can now be triggered and probed on their characteristic time and length scales. Probing such excitations far from equilibrium motivates the field of ultrafast thermodynamics, which translates well-understood concepts, such as entropy and heat, to (sub)picosecond dynamics.
I will introduce the concept of ultrafast thermodynamics using the example of entropy production due to laser-driven phonons [1] and magnons [2] using stochastic thermodynamics. Furthermore, I will show extensions of the formalism to non-Markovian behavior and quantum mechanics. Finally, I will demonstrate how phase transitions can be triggered on subpicosecond timescales and introduce the concept of axial phonomagnetism [3].
[1] L. Caprini, H. Löwen & R. M. Geilhufe, Nature Communications, 15, 94 (2024)
[2] F. Tietjen, R. M. Geilhufe, PNAS Nexus, 4, 3 (2025)
[3] N. Shabala, R. M. Geilhufe, Physical Review Letters, 133, 266702 (2025)
Organizatorem Kolokwium Czwartkowego jest Instytut Fizyki UMK w Toruniu.