Two-field optical methods to control magnetic Feshbach resonances
Abstract
Using an optically-trapped mixture of the two lowest hyperfine states of a 6Li Fermi gas, we observe two-field optical tuning of the narrow Feshbach resonance by up to 3 G and an increase in spontaneous lifetime near the broad resonance from 0.5 ms to 0.4 s. We present a new model of light-induced loss spectra, employing continuum-dressed basis states, that agrees in shape and magnitude with measurements for both broad and narrow resonances.
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