[Triumf-seminars] TRIUMF Seminar today at 14:00
postmaster at admin.triumf.ca
postmaster at admin.triumf.ca
Wed Mar 17 05:00:03 PDT 2010
Date/Time: Wed 2010-03-17 at 14:00
Location: Auditorium
Speaker: Martin Berninger (Institut für Experimentalphysik, Universität Innsbruck, Austria)
Title: Efimov-physics in ultracold atomic gases
Abstract: In 1970, the young Russian physicist V. Efimov focused his attention on the situation of three identical bosons with resonant two-body interactions. He realized that in this particular situation the three-body problem becomes universal in the sense that details of the short-range interaction become irrelevant except for an additional quantity, the so-called three-body parameter. The problem is then fully characterized by just two parameters, no matter whether nucleons, atoms, or other resonantly interacting particles are considered-Efimov found a series of giant trimer states that exist in the absence of any two-body bound state. These Efimov-trimers connect from the tree particle threshold to the particle-dimer threshold and feature a surprising geometric scaling law, containing a factor 22.7.
In my talk I want to discuss the Efimov-scenario and the role of universality in few-body physics. I will speak about the control knobs in ultracold gases, were the collision energies are extremenly low (typically in the pico-eV range), which allowed to enter the fascinating world of Efimov physics. I will present recent experiments showing evidences for Efimov features as well as for the extended scenario involving four particle states.
Stimulants available 15 minutes before the talk.
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