Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 55: Posters - Soft Matter, Glasses

DY 55.8: Poster

Donnerstag, 23. März 2017, 17:00–19:30, P1A

From glass to supercooled liquid: long-range correlation of shear strain persists — •Muhammad Hassani and Fathollah Varnik — Interdiciplinary center for advanced material Simulations (ICAMS), Ruhr Universität, Bochum, Germany

While the elasticity in glassy materials is shown to be responsible to mediate long-range strain correlations, there are evidences of similar long-range correlations in the supercooled state as well [1], though low frequency shear modulus vanishes for this state. Via molecular dynamics simulations of a 3D binary Lennard-Jones glass former, we study the temporal evolution of these correlations in supercooled and glassy states [2]. Beside the quadropolar symmetry, the supercooled liquid shares with the glass also the 1/r³ power-law decay of strain correlations. Interestingly, the evolution of strain amplitude follows a similar pattern as the single-particle mean-square displacement; in the glass, the amplitude comes to arrest in long time intervals, whereas it follows a diffusive growth in the supercooled state. These findings are in quantitative agreement with the mode-coupling theory predictions which suggest that high viscosity in supercooled state facilitates long-range correlations [3].

[1] J. Chattoraj, A. Lemaître, Elastic Signature of Flow Events in Supercooled Liquids Under Shear, Phys. Rew. Lett.,111, 2013

[2] M. Hassani, F. Varnik, Survey of spatio-temporal strain correlations across the glass transition, (in preparation)

[3] B. Illing, S. Fritschi, D. Hajnal, C. Klix, P. Keim,M. Fuchs, Strain Pattern in Supercooled Liquids, Phys. Rev. Lett. 117, 208002