The condensed matter theory team studies various subjects of matter in its solid or fluid state. Advanced numerical or analytical tools are used : Monte Carlo simulations, lattice Boltzmann methods, Feynman diagrams ...

 Hydrodynamics theory is a first field of research. Here the method employed is based on lattice Boltzmann simulation. This enables in particular to compute compressible flows.

Ultracold atoms are another subject widely studied in the team :

 properties of interacting bosons in a trapping potential are very accurately computed using an efficient path integral Monte Carlo algorithm. In this way, one can access theoretically to quantities such as condensate fractions and wave functions as well as superfluid properties. This enables detailed comparison with experiments.

 the physics of interacting ultracold fermions, particularly the BEC- BCS crossover, is also intensively studied. The theoretical techniques used here are quantum field theory (Feynman diagrams) and hydrodynamics (for collective modes). Few body (3 or 4 particles) problems are also studied in this context. Theoretical results are naturally also compared to experiments.

Members of the team also work on other sujects such as mesoscopic physics (current noise in nanodevices) or statistical physics (hard spheres problem).

Team members : Roland Combescot, Dominique d’Humières, Werner Krauth, Xavier Leyronas

Web sites :

https://www.lps.ens.fr/~combesco

https://www.lps.ens.fr/~dominiq

https://www.lps.ens.fr/~krauth

https://www.lps.ens.fr/~leyronas

Preprints on arxiv.org :

Xavier Leyronas

Roland Combescot

Dominique d’Humières

Werner Krauth