Efimov states

Illustration of Efimov’s scenario

In summer 2oo5, we observed the first experimental signature of an Efimov quantum state in an ultracold gas of cesium atoms. This work was the starting point for a new branch in cold-atom physics.

Here are the major milestones of our work on Efimov states:

2005/06: Evidence for an Efimov quantum state
Kraemer et al., Nature 440, 315 (2016)
Some background information from our old webpage

2009: Observation of an atom-dimer Efimov resonance
Knoop et al., Nat. Phys. 5, 227 (2009)

2009: Evidence for four-body bound states tied to Efimov trimers
Ferlaino et al., Phys. Rev. Lett. 102, 140401 (2009)
See Viewpoint in Physics by B. Esry

2011: Three-body parameter universality
Berninger et al., Phys. Rev. Lett. 107, 120401 (2011)

2014: Verification of the Efimov period
Huang et al., Phys. Rev. Lett. 112, 190401 (2014)
See Viewpoint in Physics by G. Modugno
For more information see our contribution to 2Physics

For a very basic introduction into Efimov physics, watch the following video (produced to promote a 2017 review article by P. Naidon and S. Endo):