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A crossover in spatio-temporal correlations of strain fluctuations in glass forming liquids

M. Hassani, M. Bruns, F. Varnik

Journal of Statistical Mechanics: Theory and Experiment (JSTAT), 2020, 014002, (2020)

DOI: 10.1088/1742-5468/ab5366

Download: BibTEX

Via molecular dynamics simulations of a generic glass former in the supercooled and normal liquid states, it is shown that spatial correlations of strain fluctuations exhibit a crossover from the well-established power-law  ~1/r^3-decay at long wavelengths to an exponential behavior, ~exp(-r/l_c) at intermediate distances. The characteristic length of the exponential decay grows both with temperature and time via,l_c \propto D(T)t , with D(T) being the temperature-dependent diffusion coefficient. This suggests that the crossover between the power-law and exponential decays is governed by a diffusion process.

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{"type":"article", "name":"m.hassani20201", "author":"M. Hassani and M. Bruns and F. Varnik", "title":"A crossover in spatiotemporal correlations of strain fluctuations in glass forming liquids", "journal":"Journal of Statistical Mechanics: Theory and Experiment (JSTAT)", "volume":"2020", "OPTnumber":"1", "OPTmonth":"1", "year":"2020", "OPTpages":"014002", "OPTnote":"", "OPTkey":"correlation functions; glasses (structural); plasticity; molecular dynamics", "DOI":"10.1088/1742-5468/ab5366"}
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