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Title: Dynamics in two-dimensional glassy systems of crowded Penrose kites
Authors: Li, Yan-Wei
Li, Zi-Qi
Hou, Zhang-Lin
Mason, Thomas G.
Zhao, Kun
Sun, Zhao-Yan
Pica Ciamarra, Massimo
Keywords: Science::Physics
Issue Date: 2019
Source: Li, Y.-W., Li, Z.-Q., Hou, Z.-L., Mason, T. G., Zhao, K., Sun, Z.-Y., & Pica Ciamarra, M. (2019). Dynamics in two-dimensional glassy systems of crowded Penrose kites. Physical Review Materials, 3(12), 125603-. doi:10.1103/PhysRevMaterials.3.125603
Journal: Physical Review Materials
Abstract: We investigate the translational and rotational relaxation dynamics of a crowded two-dimensional system of monodisperse Penrose kites, in which crystallization, quasicrystallization and nematic ordering are suppressed, from low to high area fractions along the metastable ergodic fluid branch. First, we demonstrate a decoupling between both the translational and the rotational diffusion coefficients and the relaxation time: the diffusivities are not inversely proportional to the relaxation time, neither in the low-density normal liquid regime nor in the high-density supercooled regime. Our simulations reveal that this inverse proportionality breaks in the normal liquid regime due to the Mermin-Wagner long-wavelength fluctuations and in the supercooled regime due to the dynamical heterogeneities. We then show that dynamical heterogeneities are mainly spatial for translational degrees of freedom and temporal for rotational ones, there is no correlation between the particles with largest translational and rotational displacements, and different dynamical length scales characterize the translational and the rotational motion. Hence, despite the translational and the rotational glass-transition densities coincide, according to a mode-coupling fit, translations and rotations appear to decorrelate via different dynamical processes.
ISSN: 2475-9953
DOI: 10.1103/PhysRevMaterials.3.125603
Schools: School of Physical and Mathematical Sciences 
Rights: © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review Materials and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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