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Observation of structural universality in disordered systems using bulk diffusion measurement.

Antonios Papaioannou1, Dmitry S Novikov2, Els Fieremans2

  • 1Department of Physics, The Graduate Center, City University of New York, New York, New York 10016, USA.

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Summary

This study experimentally distinguishes disorder universality classes using classical diffusion measurements. It verifies the link between structural exponents and diffusion dynamics in disordered systems.

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Area of Science:

  • Physics
  • Materials Science
  • Complex Systems

Background:

  • Disordered systems exhibit diverse structural properties influencing transport phenomena.
  • Understanding the relationship between structure and dynamics is crucial for materials characterization.

Purpose of the Study:

  • To experimentally differentiate structural universality classes in one-dimensional disordered systems.
  • To investigate the connection between structural disorder and classical diffusion dynamics.

Main Methods:

  • Fabrication and characterization of disordered systems with hyperuniform and short-range disorder.
  • Measurement of time-dependent diffusion coefficients using Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Analysis of structural exponents and dynamical exponents of diffusion.

Main Results:

  • Classical diffusion successfully distinguished between hyperuniform and short-range disorder universality classes.
  • Experimental verification of the relationship between structural and dynamical exponents.
  • Demonstration that dynamics are primarily governed by universality class, with minor influence from microscopic parameters.

Conclusions:

  • The study establishes a link between structural complexity and transport properties in disordered media.
  • This work enables noninvasive characterization of structural correlations in porous materials, complex materials, and biological tissues through diffusion measurements.