Feshbach spectroscopy of a K-Rb atomic mixture

Year: 2006

Authors: Ferlaino F., D’Errico C., Roati G., Zaccanti M., Inguscio M., Modugno G., Simoni A.

Autors Affiliation: LENS and Dipartimento di Fisica, Università di Firenze, and INFM-CNR, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy;
Laboratoire de Physique des Atomes, Lasers, Molecules et Sufaces, UMR 6627 du CNRS and Université de Rennes, France

Abstract: We perform extensive magnetic Feshbach spectroscopy of an ultracold mixture of fermionic K-40 and bosonic Rb-87 atoms. The magnetic-field locations of 13 interspecies resonances are used to construct a quantum collision model able to predict accurate collisional parameters for all K-Rb isotopic pairs. In particular, we determine the interspecies s-wave singlet and triplet scattering lengths for the K-40-Rb-87 mixture as (-108 +/- 3)a(0) and (-205 +/- 5)a(0), respectively. We also predict accurate scattering lengths and the position of Feshbach resonances for the other K-Rb isotopic pairs. We discuss the consequences of our results for current and future experiments with ultracold K-Rb mixtures.


Volume: 73      Pages from: 040702-1  to: 040702-4

KeyWords: Atomic mixture; Feshbach resonances; Feshbach spectroscopy; Ultracold K-Rb mixtures, Collision avoidance; Potassium; Quantum theory; Resonance; Rubidium; Spectroscopic analysis, Fermions; Ultracold gases
DOI: 10.1103/PhysRevA.73.040702

Citations: 138
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