Dresden 2026 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: Glasses and Glass Transition (joint session DY/CPP)

CPP 35.3: Talk

Wednesday, March 11, 2026, 12:00–12:15, ZEU/0118

Strain-rate dependent rheological memory in a model glass former — •Monoj Adhikari and Jürgen Horbach — Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany

We investigate the shear response of deeply supercooled liquids far below the mode coupling critical temperature of a model glass former. Our system is based on the Kob-Andersen binary Lennard-Jones mixture (KABLJM) model but incorporates polydispersity, allowing us to combine SWAP Monte Carlo (MC) with Molecular Dynamics (MD) simulations. This hybrid approach enables equilibration at temperatures far below the Mode-Coupling critical temperature, T_MCT, while maintaining an equation of state similar to the original binary KABLJM model. We examine the response of these equilibrated samples to shear deformation at finite temperature and strain rate. By combining MD with SWAP MC during shear, we demonstrate that states with stress far below the yield stress can be accessed, making Newtonian fluid behavior observable even at temperatures well below T_MCT. To characterize the Newtonian fluid states obtained from this hybrid approach, as well as the solid-like states from standard MD, we employ a strain-rate switching protocol on the steady states. When applying this protocol to the stationary states, we observe intriguing memory effects. In the transient regime, stress overshoots appear when increasing the strain rate, whereas a striking stress undershoot emerges when decreasing it, mirroring recent experimental observations in polymer glasses.

Keywords: deeply super-cooled liquids; swap Monte Carlo; yield stress; Newtonian fluid