Voir aussi
Controlling strongly correlated electrons with light
Andrea CAVALLERI, Max Planck Research Department for Structural Dynamics, Center for Free Electron Laser Science, Hamburg, Professor at the Universities of Hamburg and Oxford.
29 avril 2010, à 17h00, Amphi Pierre Faurre, Ecole Polytechnique
"Solids with strongly correlated electrons are those in which Coulomb interactions between pairs of carriers exceed their kinetic energies. These materials can exhibit very surprising properties, such as hightemperature superconductivity, or colossal magnetoresistance.
I will describe how coherent electromagnetic fields can be used to manipulate both electron charges and the lattice to control macroscopic properties dynamically. The overarching goal is to induce new phenomena and functionalities.
- How can light control electrical and optical properties?
- Can it be used to induce superconductivity?
- By using light and by wtaching the evolving properties, can we understand aspects of the underlying physics any better than with static probes techniques?
Our work has also a strong methodological component. We work with tabletop femtosecond sources, synchrotron radiatio, and free electron lasers, with goal of extending to the ultrafast timescale the wealth of static x-ray probes that have revolutionized solid-state physics."
Séminaire général de Physique
Suivi d'un cocktail à 18h15