Category: List of Bases 2009 Throughout the year RESEARCH IN CONDENSED MATTER PHYSICS

Title:

JOINT ICTP/SISSA STATISTICAL PHYSICS SEMINAR: "Three body physics with ultracold atoms: the Efimov effect and P-wave Feshbach resonances for spin polarized fermions"

Start Time:

12:30

Location:

Lecture Room D - SISSA Main Building

Speaker(s):

Mattia JONA-LASINIO (LENS, Italy)

Description:

In the first part of the talk I will very briefly review the basic facts about scattering theory in the S-wave and P-wave channel. I will introduce the notions needed to describe low energy collisions in ultracold atoms: scattering amplitude, scattering length, scattering volume, true range and effective range of the interaction. I will then review the Efimov effect for a bosonic system.
The main part of the talk will be devoted to the three-body problem for polarized fermions, close to a P-wave Feshbach resonance. I will present a two channel model useful to describe the P-wave interaction. Through numerical and analytical solutions of the model, I obtain predictions for all the physical quantities relevant for present experiments: low energy elastic and inelastic scattering properties, existence and lifetime of weakly bound trimers, atom loss rate through the three-body recombination mechanism. The model also excludes the presence of an Efimov effect in the P-wave channel.
Applications and future developments will conclude the talk.