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Intermediate phase between jammed and unjammed amorphous solids.

Yuliang Jin1, Itamar Procaccia2,3, Tuhin Samanta2

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Researchers found a second jamming transition in two-dimensional granular systems. This transition separates quasielastic and anomalously mechanical states, offering new insights into amorphous solid behavior.

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Area of Science:

  • Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Athermal amorphous solids exhibit jamming at a critical volume fraction.
  • This jamming phenomenon leads to a sharp increase in pressure and critical exponents.

Purpose of the Study:

  • To investigate a second transition within the jammed state of 2D granular systems.
  • To characterize the distinct mechanical responses of different jamming regimes.

Main Methods:

  • Analysis of two-dimensional granular systems at varying volume fractions.
  • Examination of mechanical responses, including pressure and screening behavior.
  • Theoretical estimation of transition parameters.

Main Results:

  • Evidence for a second transition within the jammed state.
  • Identification of two distinct mechanical regimes: quasielastic (quadrupole screening) and anomalous (dipole screening).
  • Observation of a transition reminiscent of the hexatic phase in 2D crystals.

Conclusions:

  • The study reveals a novel transition within jammed granular systems.
  • This transition highlights different mechanical behaviors based on packing density.
  • Findings contribute to understanding the complex mechanics of amorphous solids.