Universality of the three-body Efimov parameter at narrow Feshbach
  resonances

There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

Abstract

We measure the critical scattering length for the appearance of the first three-body bound state, or Efimov three-body parameter, at seven different Feshbach resonances in ultracold 39K atoms. We study both intermediate and narrow resonances, where the three-body spectrum is expected to be determined by the non-universal coupling of two scattering channels. We observe instead approximately the same universal relation of the three-body parameter with the two-body van der Waals radius already found for broader resonances, which can be modeled with a single channel. This unexpected observation suggests the presence of a new regime for three-body scattering at narrow resonances.

Related collections

Most cited references 15

Record: found
Abstract: found
Article: found

Is Open Access

Feshbach Resonances in Ultracold Gases

Eite Tiesinga, Paul Julienne, Rudolf Grimm … (2008)

Feshbach resonances are the essential tool to control the interaction between atoms in ultracold quantum gases. They have found numerous experimental applications, opening up the way to important breakthroughs. This Review broadly covers the phenomenon of Feshbach resonances in ultracold gases and their main applications. This includes the theoretical background and models for the description of Feshbach resonances, the experimental methods to find and characterize the resonances, a discussion of the main properties of resonances in various atomic species and mixed atomic species systems, and an overview of key experiments with atomic Bose-Einstein condensates, degenerate Fermi gases, and ultracold molecules.

0 comments Cited 628 times – based on 0 reviews

Preprint

     Review now

Bookmark

Record: found
Abstract: found
Article: found

Is Open Access

Collisional stability of a three-component degenerate Fermi gas

S. Jochim, T. Lompe, M Kohnen … (2008)

We report on the creation of a degenerate Fermi gas consisting of a balanced mixture of atoms in three different hyperfine states of \(^6\)Li. This new system consists of three distinguishable Fermions with different and tunable interparticle scattering lengths \(a_{12}\), \(a_{13}\) and \(a_{23}\). We are able to prepare samples containing \(5 \cdot 10^4\) atoms in each state at a temperature of about \(215 \)nK, which corresponds to \(T/T_F \approx 0.37\). We investigated the collisional stability of the gas for magnetic fields between 0 and 600 G and found a prominent loss feature at 130 G. From lifetime measurements we determined three-body loss coefficients, which vary over nearly three orders of magnitude.

0 comments Cited 104 times – based on 0 reviews

Preprint

     Review now

Bookmark

Record: found
Abstract: found
Article: found

Is Open Access

Observation of universality in ultracold 7Li three-body recombination

Lev Khaykovich, Servaas Kokkelmans, Noam Gross … (2009)

We report on experimental evidence of universality in ultracold 7Li atoms' three-body recombination loss in the vicinity of a Feshbach resonance. We observe a recombination minimum and an Efimov resonance in regions of positive and negative scattering lengths, respectively, which are connected through the pole of the Feshbach resonance. Both observed features lie deeply within the range of validity of the universal theory and we find that the relations between their properties, i.e. widths and locations, are in an excellent agreement with the theoretical predictions.