In a recent PRL publication (https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.015501), a research team led by professor Matteo Baggioli from SJTU Shanghai and professor Alessio Zaccone from University of Milano, discovered, for the first time, well-defined topological defects in amorphous solids by analyzing the topological structure of the dynamical displacement field under deformation. This new description based on topological higher-form symmetries quantifies the amount of non-affine displacements at the atomic/molecular level and uses it as a topological predictor of plastic events using the geometrical concept of dynamical Burgers vector. The new theory provides a very accurate prediction for the yielding point at the plasticity transition of amorphous solids, and explains the occurrence of shear bands ubiquitously observed in experiments.
Matteo just presented the recent works published in PNAS and PRL at ITP in Beijing!
Matteo appeared in a video advertisement of the the Physics department of the university!
Matteo attended and presented his recent work in the “GRA 2020/2021 Annual Conference and National Congress on Gravity” in Shenyang, China (23-26 April 2021).
Our future PhD student Giorgio Frangi just defended his master thesis under the supervision of Matteo, Prof. Alessio Zaccone and Prof. Oriol Pujolas. He obtained the maximum grade and he is ready for his next step!
Congratulations Giorgio !!!
And thanks to Alessio and Oriol for supporting TheoryLab!
Matteo attended and presented at the “2021 International Workshop on Soft Matter and Biophysics Theories—Youth Forum”, which was organized by the Institute of Theoretical Physics, Chinese Academy of Sciences (ITP-CAS) and CAS Key Laboratory for Theoretical Physics, and hosted by Minjiang University.
Minjiang University, Fuzhou, Fujian, March 22nd– 25th 2021
In an article published in the journal PNAS by Matteo Baggioli, and Alessio Zaccone of University of Milano, the law which governs the distribution of vibrational energy states of liquids has been derived mathematically for the first time. The new mathematical theory by Zaccone & Baggioli solved the problem of obtaining the distribution of these complex energy states by combining the so-called Zeldovich regularization for unstable quantum states with the mathematical theory of distributions by L. Schwartz. The final result provides an equation in closed form for the distribution of energy states in liquids, which goes linear in the frequency, as opposed to the Debye law for solids, which goes quadratic in frequency, and also correctly predicts its temperature dependence.
The team is growing! From September 2021 we will have 3 new members: Takaaki Ishii, Yongjun Ahn and Giorgio Frangi. Welcome to Shanghai !