Long-wavelength fluctuations and anomalous dynamics in 2-dimensional liquids

Li, Yan-Wei ; Mishra, Chandan K. ; Sun, Zhao-Yan ; Zhao, Kun ; Mason, Thomas G. ; Ganapathy, Rajesh ; Pica Ciamarra, Massimo (2019) Long-wavelength fluctuations and anomalous dynamics in 2-dimensional liquids Proceedings of the National Academy of Sciences of the United States of America, 116 (46). pp. 22977-22982. ISSN 0027-8424

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Official URL: https://doi.org/10.1073/pnas.1909319116

Related URL: http://dx.doi.org/10.1073/pnas.1909319116

Abstract

Long-wavelength Mermin-Wagner fluctuations prevent the existence of translational long-range order, in two-dimensional systems at finite temperature. Their dynamical signature, which is the divergence of the vibrational amplitude with the system size, also affects disordered solids and washes out the transient solid-like response generally exhibited by liquids cooled below their melting temperature. Through a combined numerical and experimental investigation, here we show that long-wavelength fluctuations are also relevant at high temperature, where the liquid dynamics does not reveal a transient solid-like response. In this regime, they induce an unusual but ubiquitous decoupling between long-time diffusion coefficient D and structural relaxation time τ, where D ∝ τ, with κ > 1. Long-wavelength fluctuations have a negligible influence on the relaxation dynamics only at extremely high temperatures, in molecular liquids, or extremely low densities, in colloidal systems.

Item Type:Article
Source:Copyright of this article belongs to National Academy of Sciences, USA.
ID Code:137891
Deposited On:22 Aug 2025 11:30
Last Modified:22 Aug 2025 11:30

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