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Measurement of the Zero Crossing in a Feshbach Resonance of Fermionic 6-Li | K.M. O’Hara
; S.L. Hemmer
; S.R. Granade
; M.E. Gehm
; J.E. Thomas
; V.Venturi
; E. Tiesinga
; C.J. Williams
; | Date: |
30 Jul 2002 | Subject: | Soft Condensed Matter; Superconductivity | cond-mat.soft cond-mat.supr-con | Abstract: | We measure a zero crossing in the scattering length of a mixture of the two lowest hyperfine states of 6-Li. To locate the zero crossing, we monitor the decrease in temperature and atom number arising from evaporation in a CO2 laser trap as a function of magnetic field B. The temperature decrease and atom loss are minimized for B=528(4) G, consistent with no evaporation. We also present preliminary calculations using potentials that have been constrained by the measured zero crossing and locate a broad Feshbach resonance at approximately 860 G, in agreement with previous theoretical predictions. In addition, our theoretical model predicts a second and much narrower Feshbach resonance near 550 G. | Source: | arXiv, cond-mat/0207717 | Services: | Forum | Review | PDF | Favorites |
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