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Lorenzo Caprini¹, Hartmut Löwen², R Matthias Geilhufe³

¹Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, 40225, Düsseldorf, Germany. lorenzo.caprini@gssi.it.

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|January 3, 2024

Summary

This summary is machine-generated.

Researchers developed ultrafast stochastic thermodynamics for laser-excited phonons. This method analyzes heat and entropy production in materials, revealing insights into non-equilibrium states and enabling better material control.

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Area of Science:

Condensed Matter Physics
Materials Science
Thermodynamics

Background:

Ultrafast material control enables investigation of exotic non-equilibrium states.
Characterizing ultrafast thermodynamic properties is crucial for designing novel materials.
Laser excitation provides a pathway to induce and study these states.

Purpose of the Study:

To develop ultrafast stochastic thermodynamics for laser-excited phonons.
To calculate entropy production and heat absorbed in driven materials.
To analyze thermodynamic properties of single phonon modes.

Main Methods:

Utilized time-resolved X-ray scattering experiments.
Applied laser pulses to excite crystalline materials.
Calculated spectral entropy production and heat absorbed from experimental data.

Main Results:

Developed a framework for ultrafast stochastic thermodynamics of phonons.
Quantified entropy production and heat absorption for phonon modes in SrTiO3 and KTaO3.
Revealed a relationship between spectral entropy production and the power spectrum of displacement correlations.

Conclusions:

The developed method allows for characterization of ultrafast thermodynamic properties.
Findings provide insights into laser-induced non-equilibrium states in materials.
The study highlights a connection between thermodynamic quantities and phonon dynamics.