Ultrafast entropy production in pump-probe experiments

The ultrafast control of materials has opened the possibility to investigate non-equilibrium states of matter with striking properties, such as transient superconductivity and ferroelectricity, ultrafast magnetization and demagnetization, as well as Floquet engineering. The characterization of the u...

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Bibliographic Details
Published in:Nature communications 2024-01, Vol.15 (1), p.94-10, Article 94
Main Authors: Caprini, Lorenzo, Löwen, Hartmut, Geilhufe, R. Matthias
Format: Article
Language:English
Subjects:
639/301/1034/1035
639/624/400/1106
Correlation
Entropy
Ferroelectricity
Humanities and Social Sciences
Magnetic properties
Mathematical analysis
multidisciplinary
Phonons
Science
Science (multidisciplinary)
Spectroscopy
Stochasticity
Superconductivity
Thermodynamic properties
Thermodynamics
X-ray scattering
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Summary:The ultrafast control of materials has opened the possibility to investigate non-equilibrium states of matter with striking properties, such as transient superconductivity and ferroelectricity, ultrafast magnetization and demagnetization, as well as Floquet engineering. The characterization of the ultrafast thermodynamic properties within the material is key for their control and design. Here, we develop the ultrafast stochastic thermodynamics for laser-excited phonons. We calculate the entropy production and heat absorbed from experimental data for single phonon modes of driven materials from time-resolved X-ray scattering experiments where the crystal is excited by a laser pulse. The spectral entropy production is calculated for SrTiO 3 and KTaO 3 for different temperatures and reveals a striking relation with the power spectrum of the displacement-displacement correlation function by inducing a broad peak beside the eigenmode-resonance. Ultrafast spectroscopy enables characterization and control of non-equilibrium states. Here the authors introduce a stochastic thermodynamics approach to calculate entropy production in a material under ultrafast excitation, using ionic displacement data from time-resolved X-ray scattering experiments.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-023-44277-w