du 13 juin 2022 au 14 juin 2022
Publié le 7 juin 2022 Mis à jour le 7 juin 2022

Séminaire de Lorenzo Fratino


From micro to macro: exploring the physics of strongly correlated systems using cluster DMFT and resistor networks approaches.

Jeudi 13 juin, 14h00 (en distanciel sur Microsoft Teams) (Séminaire de Matière Condensée )

From micro to macro: exploring the physics of strongly correlated systems using cluster DMFT and resistor networks approaches.

(Université Paris-Saclay)

In the first part of the seminar, we will discuss a microscopical point of view of strongly correlated theory. We will compare the solution of the Hubbard model 
by using continuous time quantum Monte Carlo with Dynamical Cluster Approximation (DCA), Cellular Dynamical Mean-Field Theory (CDMFT) and the Dimer Hubbard model on the Bethe lattice to address the unusual features of the normal-state phenomena.
In the second part, we will address the complexity of experiment on resistive switching that can be understood by the use of the resistor network model. 
We will see how in VO2 the ability to induce volatile resistive switching create conductive filaments, a key feature for developing novel hardware for neuromorphic. 
Instead, in LSMO we found that the opposite type of resistive switching, from a metal into an insulator, occurs in a reciprocal characteristic spatial pattern: the formation of an insulating barrier perpendicular to the driving current.
Fratino, L., Sémon, P., Sordi, G., & Tremblay, A. (2016). An organizing principle for two-dimensional strongly correlated superconductivity. Scientific reports, 6(1), 1-6 https://www.nature.com/articles/srep22715
Fratino, L., Shinaoka, H., Nomura, Y., De Medici, L., in preparation
Fratino, L., et al. "Doping-driven resistive collapse of the Mott insulator in a minimal model for VO 2." Physical Review B 105.12 (2022) https://journals.aps.org/prb/abstract/10.1103/PhysRevB.105.125140
Cheng, S., Lee, M. H., Li, X., Fratino, L., Tesler, F., Han, M. G., ... & Zhu, Y. (2021). Operando characterization of conductive filaments during resistive switching in Mott VO2. Proceedings of the National Academy of Sciences, 118(9) https://www.pnas.org/doi/10.1073/pnas.2013676118
Salev, P., Fratino, L., Sasaki, D., Berkoun, R., Del Valle, J., Kalcheim, Y., ... & Schuller, I. K. (2021). Transverse barrier formation by electrical triggering of a metal-to-insulator transition. Nature communications, 12(1), 1-7. Nature communications, 12(1), 2021 https://www.nature.com/articles/s41467-021-25802-1
Del Valle, J., Vargas, N.M., Rocco, R., Salev, P., Kalcheim, Y., Lapa, P.N., Adda, C., Lee, M.H., Wang, P.Y., Fratino, L. and Rozenberg, M.J., 2021. Spatiotemporal characterization of the field-induced insulator-to-metal transition. Science, 373(6557) https://www.science.org/doi/full/10.1126/science.abd9088?casa_token=By5zscjaND0AAAAA:WiHL8jqlWWGTo5Ax_FO2_Ar7XuiNQzXHsWC6Gp-VneRjGSyt2ATI5si6PSM8fMlGi3Ovn2FZ2aIopA

Pour s'inscrire à la session Teams, merci d'envoyer un mail à Jean AVAN.