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Updated: May 29, 2025

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Collective excitations in active solids featuring alignment interactions.

Yutaka Kinoshita1,2, Nariya Uchida2, Andreas M Menzel1

  • 1Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.

The Journal of Chemical Physics
|February 7, 2025
PubMed
Summary
This summary is machine-generated.

Active solids, composed of self-propelled units, exhibit collective excitations. These excitations in migrating active solids are linked to entropy production, differing from passive solids and prompting further experimental study.

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Area of Science:

  • Condensed matter physics
  • Soft matter physics
  • Statistical mechanics

Background:

  • Active solids are nonequilibrium systems of elastically linked, self-propelled units.
  • The study of their collective behaviors, including ordered and migrating states, is gaining importance.
  • Understanding the dynamic features beyond their existence is crucial.

Purpose of the Study:

  • To analyze the excitability of collectively moving elastic states in active solids.
  • To investigate the relationship between excitation modes and entropy production.
  • To differentiate the dynamic properties of active solids from passive ones.

Main Methods:

  • Analysis of fluctuation spectra in collectively moving elastic states.
  • Comparison of fluctuation spectra between active and passive solids.
  • Investigation of the link between intrinsic fluctuations and entropy production.

Main Results:

  • Collectively excitable modes were identified in migrating active solids.
  • Distinct differences in fluctuation spectra were observed compared to passive solids.
  • Modes of excitation were found to correlate with modes of entropy production.

Conclusions:

  • Active solids exhibit unique collectively excitable modes.
  • These excitations are intrinsically linked to entropy production.
  • The findings encourage experimental research into excitations in active solids.