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Title: Structural transitions and hysteresis in clump- and stripe-forming systems under dynamic compression

In using numerical simulations, we study the dynamical evolution of particles interacting via competing long-range repulsion and short-range attraction in two dimensions. The particles are compressed using a time-dependent quasi-one dimensional trough potential that controls the local density, causing the system to undergo a series of structural phase transitions from a low density clump lattice to stripes, voids, and a high density uniform state. The compression proceeds via slow elastic motion that is interrupted with avalanche-like bursts of activity as the system collapses to progressively higher densities via plastic rearrangements. The plastic events vary in magnitude from small rearrangements of particles, including the formation of quadrupole-like defects, to large-scale vorticity and structural phase transitions. In the dense uniform phase, the system compresses through row reduction transitions mediated by a disorder-order process. We also characterize the rearrangement events by measuring changes in the potential energy, the fraction of sixfold coordinated particles, the local density, and the velocity distribution. At high confinements, we find power law scaling of the velocity distribution during row reduction transitions. We observe hysteresis under a reversal of the compression when relatively few plastic rearrangements occur. The decompressing system exhibits distinct phase morphologies, and the phase transitions occurmore » at lower compression forces as the system expands compared to when it is compressed.« less
Authors:
 [1] ; ORCiD logo [2] ; ORCiD logo [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Wabash College, Crawfordsville IN (United States). Dept. of Physics
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-26389
Journal ID: ISSN 1744-683X; SMOABF; TRN: US1800212
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Soft Matter
Additional Journal Information:
Journal Volume: 12; Journal Issue: 47; Journal ID: ISSN 1744-683X
Publisher:
Royal Society of Chemistry
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Material Science
OSTI Identifier:
1411344

McDermott, Danielle, Olson Reichhardt, Cynthia J., and Reichhardt, Charles. Structural transitions and hysteresis in clump- and stripe-forming systems under dynamic compression. United States: N. p., Web. doi:10.1039/C6SM01939K.
McDermott, Danielle, Olson Reichhardt, Cynthia J., & Reichhardt, Charles. Structural transitions and hysteresis in clump- and stripe-forming systems under dynamic compression. United States. doi:10.1039/C6SM01939K.
McDermott, Danielle, Olson Reichhardt, Cynthia J., and Reichhardt, Charles. 2016. "Structural transitions and hysteresis in clump- and stripe-forming systems under dynamic compression". United States. doi:10.1039/C6SM01939K. https://www.osti.gov/servlets/purl/1411344.
@article{osti_1411344,
title = {Structural transitions and hysteresis in clump- and stripe-forming systems under dynamic compression},
author = {McDermott, Danielle and Olson Reichhardt, Cynthia J. and Reichhardt, Charles},
abstractNote = {In using numerical simulations, we study the dynamical evolution of particles interacting via competing long-range repulsion and short-range attraction in two dimensions. The particles are compressed using a time-dependent quasi-one dimensional trough potential that controls the local density, causing the system to undergo a series of structural phase transitions from a low density clump lattice to stripes, voids, and a high density uniform state. The compression proceeds via slow elastic motion that is interrupted with avalanche-like bursts of activity as the system collapses to progressively higher densities via plastic rearrangements. The plastic events vary in magnitude from small rearrangements of particles, including the formation of quadrupole-like defects, to large-scale vorticity and structural phase transitions. In the dense uniform phase, the system compresses through row reduction transitions mediated by a disorder-order process. We also characterize the rearrangement events by measuring changes in the potential energy, the fraction of sixfold coordinated particles, the local density, and the velocity distribution. At high confinements, we find power law scaling of the velocity distribution during row reduction transitions. We observe hysteresis under a reversal of the compression when relatively few plastic rearrangements occur. The decompressing system exhibits distinct phase morphologies, and the phase transitions occur at lower compression forces as the system expands compared to when it is compressed.},
doi = {10.1039/C6SM01939K},
journal = {Soft Matter},
number = 47,
volume = 12,
place = {United States},
year = {2016},
month = {11}
}