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SUMMARY:Matthias Geilhufe (Chalmers)
DTSTART:20260323T121500Z
DTEND:20260323T130000Z
DTSTAMP:20260417T004741Z
UID:cam/101
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/cam/101/">Ul
 trafast Thermodynamics - towards entropy\, heat and criticality on picosec
 ond timescales</a>\nby Matthias Geilhufe (Chalmers) as part of CAM seminar
 \n\nLecture held in MV:L14.\n\nAbstract\nMaterials are composed of a vast 
 number of ions and electrons\, arranging themselves in regular patterns. D
 ue to immense progress in ultrafast spectroscopy\, ranging from the low-fr
 equency infrared to high-frequency X-ray regimes\, collective excitations 
 of charge\, spin\, lattice\, and orbital degrees of freedom can now be tri
 ggered and probed on their characteristic time and length scales. Probing 
 such excitations far from equilibrium motivates the field of ultrafast the
 rmodynamics\, which translates well-understood concepts\, such as entropy 
 and heat\, to picosecond dynamics. I will introduce the concept of ultrafa
 st thermodynamics using the example of entropy production due to laser-dri
 ven phonons [1] and magnons [2] using stochastic thermodynamics. I will sh
 ow that these processes are well described by Langevin equations and intro
 duce their derivation on a few examples. Furthermore\, I will show extensi
 ons of the formalism to non-Markovian behavior and quantum mechanics [3].\
 n\n\n[1] L. Caprini\, H. Löwen & R. M. Geilhufe\, Nature Communications\,
  15\, 94 (2024) \n\n[2] F. Tietjen\, R. M. Geilhufe\, PNAS Nexus\, 4\, 3 (
 2025)\n\n[3] Y. Qiao\, R. M. Geilhufe\, arXiv:2512.17669\n
LOCATION:https://researchseminars.org/talk/cam/101/
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