Universal criticality at and around the jamming transition

Time: Wednesday, September 14, 2016 - 2:30pm - 3:30pm
Type: Seminar Series
Presenter: Patrick Charbonneau, Duke University
Room/Office: Mason 107
Location:
9 Hillhouse Avenue
New Haven, CT 06511
United States

Department of Mechanical Engineering & Materials Science

Professor Patrick Charbonneau
Associate Professor of Chemistry, Physics and CBB Program
Duke University, Durham, North Carolina

Universal criticality at and around the jamming transition

A first-principles theory of glass formation and jamming for frictionless spheres in infinite dimensions was recently formulated. This theoretical tour-de-force enlightens our understanding of Edwards entropy and predicts non-trivial power-law exponents that describe the packing structure near jamming. Remarkably, the latest numerical assessment of these predictions in finite-dimensional systems finds that many of its aspects are robustly preserved for spatial dimensions greater or equal to two. Constructing isostatic jammed packings with high accuracy further pinpoint the structural origin of the small deviations from these predictions, i.e., rattlers and localized buckling excitations. The theory also predicts the existence, -- deep in the glass state -- of a Gardner transition, which is has a strong signature on wide array of glass properties in both experiments and simulations. A unified understanding of amorphous solids is therefore emerging.

Wednesday, September 14, 2016
2:30 – 3:30 pm
Mason 107
Host: Professor Corey O'Hern
Refreshments served at 2:15 pm