Coming back from Advances in Complex Systems (Lake Como School of Advanced Studies)

Last week has been full of nice discoveries at LCSAS . Physics has still a lot to say about biological systems. Thanks to Stefano Zapperi, Caterina La Porta and Mikko Alava for bringing together some great speakers and given us the opportunity to participate.

 

My visit to Naples!

I had had the pleasure to be in Napoli giving a seminar at the Physics Department of the University of Naples Federico II, followed by very interesting discussions with colleagues that showed up for the occasion. I would like to thank all of them and specially my host in this visit and good friend Raffaele Pastore for such a wonderful time in the adoptive city of Diego Armando 🙂 .

Our article “Spatiotemporal patterns in ultraslow domain wall creep dynamics” published in PRL

(edited) Our article is now available online in Phys. Rev. Lett. !

In presence of impurities, ferromagnetic and ferroelectric domain walls slide only above a finite external field. Close to this depinning threshold, they proceed by large and abrupt jumps, called avalanches, while, at much smaller field, these interfaces creep by thermal activation. In this work we develop a novel numerical technique that captures the ultra-slow creep regime over huge time scales. We point out the existence of activated events that involve collective reorganizations similar to avalanches, but, at variance with them, display correlated spatio-temporal patterns that resemble the complex sequence of aftershocks observed after a large earthquake. Remarkably, we show that events assembly in independent clusters that display at large scales the same statistics as critical depinning avalanches. We foresee this correlated dynamics being experimentally accessible by magneto-optical imaging of ferromagnetic films.

My visit to Aalto University (Finland)

I have visited the CSM group at Aalto University in Helsinki, and attended the International Workshop on Machine Learning for Materials Science that was organized there. Many thanks to Lasse Laurson and Mikko Alava for their kind hospitality!

I’m now a member of the Network of Argentinean Researchers in Italy (RCAI)

Take a look!!

EZEQUIEL FERRERO


About the network: http://www.rcai.it/que-es-rcai/

Our article “Inertia and universality of avalanche statistics: The case of slowly deformed amorphous solids” accepted for publication in PRE.

In this paper, with Kamran Karimi and Jean-Louis Barrat, we solve numerically the dynamics of an amorphous solid under deformation in the quasistatic driving limit, by means of a finite elements technique. We study the noise statistics of the stress-strain signal in the steady state plastic flow, focusing on systems with low internal dissipation. We analyze the distributions of avalanche sizes and durations and the density of shear transformations when varying the damping strength. In contrast to avalanches in the overdamped case, dominated by the yielding point universal exponents, inertial avalanches are controlled by a non-universal damping dependent feedback mechanism; eventually turning negligible the role of correlations. Still, some general properties of avalanches persist and new scaling relations can be proposed.

It will be available soon in PRE.

I have participated at MMM-Dijon

Few weeks ago I had the pleasure to participate at the 8th Multiscale Materials Modeling (MMM) international conference in Dijon, France, where I presented our work on the avalanche statistics near the yielding transition. It was a week full of interesting discussions and new motivating ideas. Thanks to the symposium D organizers for the opportunity.

Our article “Inertia and universality of avalanche statistics: the case of slowly deformed amorphous solids” is online!

Together with Kamran Karimi and Jean-Louis Barrat in this article we study the noise statistics of the stress-strain signal in the steady state plastic flow, focusing on systems with low internal dissipation.

Coming back from STATPHYS26 in Lyon

These have been great days of a magnificent conference in Statistical Physics in Lyon, the STATPHYS26. I’m thankful to have had the opportunity of participating and, even more, for having the chance to give a talk surrounded by the greatest physicists in the field.

Not only it was a beautiful week in terms of science, but also on the football side. Our team “The Americas” (picture below) won the Statphys2016 World Cup!

But maybe the greatest news is that STATPHYS27 will be held in Argentina! This is a wonderful chance and a big challenge for our local community. See you all in Buenos Aires in 2019!

StattPhys2016champions

I have just participated in “Statistical physics of materials” in Aussois, France, ….

where I presented my talk “Avalanche statistics at the yielding transition of amorphous solids -driving rate dependence and inertial effects-“.

I would like to thank the organizers Mikko J. Alava, Lasse Laurson, Stephane Santucci and Stefano Zapperi, for the very nice StatPhys26 satellite meeting we had, in a very nice place in the Alps.

I have met there for the first time many interesting people. Now I would be able to match last names with faces when I read their papers :^) .