Conférences et séminaires » Séminaire présenté par le Dr. Mario GATTOBIGIO, Université de Nice-Sophia (...)
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Efimov Physics in small bosonic clusters2
Par : Dr. Mario GATTOBIGIO, Université de Nice-Sophia Antipolis, Institut Non-Linéaire de Nice, CNRS, Valbonne
Date : mardi 19 juin 2012 à 11h00
Lieu : IPHC, Salle de Réunion 2e étage du Bâtiment 27
In recent years the interest in few-body physics has received a significant boost thanks to experimental investigations of Efimov physics using cold atoms. With the term Efimov physics it is customary to design all the ensemble of universal relations found in few-body systems when the scattering length of the two-body subsystem is unnaturally large (for recent reviews see  and ). After a general introduction to the Efimov physics, I will present the work done the author in the study of the Efimov physics for systems up to six particles . In order to keep contact with reality, we have worked with a bosonic system made of 4He atoms, whose interaction is such that the few-body systems fall inside the Efimov physics. I will show how the universality manifest itself in these systems. In order to make the calculations we used the Hyperspherical Harmonics (HH) basis set, which has been widely used in the few-body literature to solve the Schroedinger equation in a variation way. This basis has several good properties ; for instance, the HH functions are the eigenfunctions of the few-body Laplacian, simplifying the calculation of the kinetic energy, and the basis has a good asymptotic description of the bound states. The main drawback of this basis is represented by its fast growing. In order to cope with this aspect of the basis, we used the non-symmetrized hyperspherical (NSHH) expansion method, with the technique recently developed by the authors , .
Personne à contacter : Radomira LOZEVA
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