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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.