Depletion of Two-Level Systems in Ultrastable Computer-Generated Glasses

In a work published in Physical Review Letters (2020), D. Khomenko, C. Scalliet, L. Berthier, D. R. Reichman and F. Zamponi show that the density of two-level systems in a glass depends on its stability, i.e. its degree of annealing. In particular, they evidenced a strong depletion of two-level systems in ultrastable glasses prepared with SWAP, a state-of-the-art algorithm.

The work was notably featured in Physics Magazine and Quanta Magazine.

Physical Review Letters
Physics Magazine
Quanta Magazine

The Simons Collaboration on Cracking the Glass Problem is organizing a webinar series on disordered systems, the glass transition, and related topics.

The Simons Collaboration on Cracking the Glass Problem is organizing a webinar series on disordered systems, the glass transition, and related topics. All researchers broadly interested in statistical physics are invited to attend. Information about the program and instructions on how to connect are available at:

https://scglass.uchicago.edu/webinars/

Beg Rohu Summer School 2019

The Beg Rohu Summer School 2019 edition on “Glasses, Jamming, and Slow Dynamics” featured lectures by collaboration members Ludovic Berthier, Andrea Liu, Gilles Tarjus and Francesco Zamponi. All the lectures have been video recorded and are available on this YouTube playlist

A stability-reversibility map for glasses

Amorphous solids have complex responses to deformations, with substantial consequences in material design and applications. In this respect, two intertwined aspects are important: stability and reversibility. It is crucial to understand, on the one hand, how a glass may become unstable due to increased plasticity under shear deformations, and, on the other hand, to what extent the response is reversible, meaning how much a system is able to recover the original configuration once the perturbation is released. In an article appeared on Science Advances (http://advances.sciencemag.org/content/4/12/eaat6387 ), Yuliang Jin, Pierfrancesco Urbani, Francesco Zamponi, and Hajime Yoshino focused on assemblies of hard spheres as the simplest model of a colloidal glasses and granular matter. They exhaustively mapped out the stability and reversibility of the glass under volume and shear strains using extensive numerical simulations. Their study provides a unified framework for understanding elasticity, plasticity, yielding, and jamming in amorphous solids.

See here [link: https://phys.org/news/2018-12-amorphous-solids-elastic-plastic.html]
and here [link: https://phys.org/news/2018-12-adventures-phase-space-plastic-elastic.html]
for more details.