Measurement of the Zero Crossing in a Feshbach Resonance of Fermionic 6Li

Published

October 1, 2002

Author(s)

K M. O'Hara, S L. Hemmer, M E. Granade, M E. Gehm, J E. Thomas, V Venturi, Eite Tiesinga, Carl J. Williams

Abstract

We measure a zero crossing in the scattering length of a mixture of the two lowest hyperfine states of 6Li. 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 near B=528 G(1G=$10-4 T), 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.

Citation

Physical Review A (Atomic, Molecular and Optical Physics)

Volume

66

Issue

No. 4

Pub Type

Journals

Keywords

fermionic lithium, fleshbach resonance, zero scattering length

Citation

O'Hara, K. , Hemmer, S. , Granade, M. , Gehm, M. , Thomas, J. , Venturi, V. , Tiesinga, E. and Williams, C. (2002), Measurement of the Zero Crossing in a Feshbach Resonance of Fermionic ⁶Li, Physical Review A (Atomic, Molecular and Optical Physics) (Accessed October 11, 2025)