Measurement of the zero crossing in a Feshbach resonance of fermionic [Formula Presented]

K. M. O’Hara, S. L. Hemmer, S. R. Granade, M. E. Gehm, J. E. Thomas, V. Venturi, E. Tiesinga, C. J. Williams

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Abstract

We measure a zero crossing in the scattering length of a mixture of the two lowest hyperfine states of [Formula Presented] To locate the zero crossing, we monitor the decrease in temperature and atom number arising from evaporation in a [Formula Presented] laser trap as a function of magnetic field B. The temperature decrease and atom loss are minimized for [Formula Presented] 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 [Formula Presented] in agreement with previous theoretical predictions. In addition, our theoretical model predicts a second and much narrower Feshbach resonance near 55 mT. 5555 2002 The American Physical Society.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume66
Issue number4
DOIs
Publication statusPublished - Jan 1 2002

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

O’Hara, K. M., Hemmer, S. L., Granade, S. R., Gehm, M. E., Thomas, J. E., Venturi, V., ... Williams, C. J. (2002). Measurement of the zero crossing in a Feshbach resonance of fermionic [Formula Presented]. Physical Review A - Atomic, Molecular, and Optical Physics, 66(4). https://doi.org/10.1103/PhysRevA.66.041401