ELFT HÍRADÓ

[Kormányos Andor <andor.kormanyos AT ttk.elte.hu>]

ELTE TTK Fizikai Intézet / ELTE Institute of Physics


ORTVAY KOLLOKVIUM / ORTVAY COLLOQUIUM
(https://physics.elte.hu/ortvayseminar)



Thursday, 24th October  2024, 15:00h.

Pócza Jenő Classroom,  Physics Building 1.71.

Pázmány Péter sétány 1/A, 1117 Budapest



Itamar Procaccia

Weizman Institute of Science


Anomalous Elasticity and Emergent Dipole Screening in Amorphous Solids
I will review our recent work in which  we developed a screening theory for 
describing the effect of plastic events in amorphous solids on their emergent 
mechanics. The suggested theory uncovered an anomalous mechanical response of 
amorphous solids where plastic events collectively induce distributed dipoles 
that are analogous to dislocations in crystalline solids. Classical 
elasticity is unable to predict the observed phenomena, and a fresh theory 
needs to be derived and solved.  The new physics is accompanied by 
translational symmetry breaking an chiral symmetry breaking, introducing 
unexpected length scales that cannot exist in classical elasticity theory. 
The theory was tested against various strain protocols of amorphous solids in 
two and three dimensions, including frictional and friction-less granular 
media and numerical models of amorphous glass.  I will conclude by 
interpreting the mechanical response as the formation of non-topological 
distributed dipoles that have no analogue in the crystalline defects 
literature. Having in mind that the onset of dipole screening is reminiscent 
of Kosterlitz-Thouless and Hexatic transitions, the finding of dipole 
screening in three-dimensions is particularly novel.

Andor Kormányos
coordinator