Unveiling Dimensionality Dependence of Glassy Dynamics: 2D Infinite Fluctuation Eclipses Inherent Structural Relaxation

Hayato Shiba, Yasunori Yamada, Takeshi Kawasaki, and Kang Kim
Phys. Rev. Lett. 117, 245701 – Published 7 December 2016
PDFHTMLExport Citation

Abstract

By using large-scale molecular dynamics simulations, the dynamics of two-dimensional (2D) supercooled liquids turns out to be dependent on the system size, while the size dependence is not pronounced in three-dimensional (3D) systems. It is demonstrated that the strong system-size effect in 2D amorphous systems originates from the enhanced fluctuations at long wavelengths which are similar to those of 2D crystal phonons. This observation is further supported by the frequency dependence of the vibrational density of states, consisting of the Debye approximation in the low-wave-number limit. However, the system-size effect in the intermediate scattering function becomes negligible when the length scale is larger than the vibrational amplitude. This suggests that the finite-size effect in a 2D system is transient and also that the structural relaxation itself is not fundamentally different from that in a 3D system. In fact, the dynamic correlation lengths estimated from the bond-breakage function, which do not suffer from those enhanced fluctuations, are not size dependent in either 2D or 3D systems.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 1 October 2015

DOI:https://doi.org/10.1103/PhysRevLett.117.245701

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Hayato Shiba1,2,*, Yasunori Yamada2,†, Takeshi Kawasaki3, and Kang Kim4,5

  • 1Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan
  • 2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 3Department of Physics, Nagoya University, Nagoya 464-8602, Japan
  • 4Department of Physics, Niigata University, Niigata 950-2181, Japan
  • 5Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan

  • *shiba@imr.tohoku.ac.jp
  • Present address: Beijing Computational Science Research Center, Beijing 100193, People’s Republic of China.

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 117, Iss. 24 — 9 December 2016

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×