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|Title:||Long-wavelength fluctuations and anomalous dynamics in 2-dimensional liquids||Authors:||Li, Yan-Wei
Mishra, Chandan K.
Mason, Thomas G.
Pica Ciamarra, Massimo
|Keywords:||Science::Physics||Issue Date:||2019||Source:||Li, Y.-W., Mishra, C. K., Sun, Z.-Y., Zhao, K., Mason, T. G., Ganapathy, R., & Pica Ciamarra, M. (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), 22977-22982. doi:10.1073/pnas.1909319116||Journal:||Proceedings of the National Academy of Sciences of the United States of America||Abstract:||In 2-dimensional systems at finite temperature, long-wavelength Mermin-Wagner fluctuations prevent the existence of translational long-range order. Their dynamical signature, which is the divergence of the vibrational amplitude with the system size, also affects disordered solids, and it washes out the transient solid-like response generally exhibited by liquids cooled below their melting temperatures. Through a combined numerical and experimental investigation, here we show that long-wavelength fluctuations are also relevant at high temperature, where the liquid dynamics do not reveal a transient solid-like response. In this regime, these fluctuations induce an unusual but ubiquitous decoupling between long-time diffusion coefficient D and structural relaxation time τ, where [Formula: see text], with [Formula: see text] Long-wavelength fluctuations have a negligible influence on the relaxation dynamics only at extremely high temperatures in molecular liquids or at extremely low densities in colloidal systems.||URI:||https://hdl.handle.net/10356/144515||ISSN:||1091-6490||DOI:||10.1073/pnas.1909319116||Rights:||© 2019 The Author(s) (Published by National Academy of Sciences). All rights reserved. This paper was published in Proceedings of the National Academy of Sciences of the United States of America and is made available with permission of The Author(s) (Published by National Academy of Sciences).||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||SPMS Journal Articles|
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