6533b82ffe1ef96bd1294f8e
RESEARCH PRODUCT
Investigation of Feshbach resonances in ultracold K40 spin mixtures
Thomas M. HannaJasper Simon KrauserKlaus SengstockSören GötzeNick FläschnerChristoph BeckerEite TiesingaM. LangbeckerM. LangbeckerLiam CookJannes Heinzesubject
Condensed Matter::Quantum GasesPhysicsQuantum gasResonanceScattering length01 natural sciences010305 fluids & plasmasSpin waveUltracold atom0103 physical sciencesAtomic physics010306 general physicsFeshbach resonanceSpin-½description
Magnetically tunable Feshbach resonances are an indispensable tool for experiments with atomic quantum gases. We report on 37 thus far unpublished Feshbach resonances and four further probable Feshbach resonances in spin mixtures of ultracold fermionic $^{40}\mathrm{K}$ with temperatures well below 100 nK. In particular, we locate a broad resonance at $B=389.7\phantom{\rule{0.16em}{0ex}}\text{G}$ with a magnetic width of $26.7\phantom{\rule{0.28em}{0ex}}\text{G}$. Here $1\phantom{\rule{0.28em}{0ex}}\text{G}={10}^{\ensuremath{-}4}\phantom{\rule{0.16em}{0ex}}\text{T}$. Furthermore, by exciting low-energy spin waves, we demonstrate a means to precisely determine the zero crossing of the scattering length for this broad Feshbach resonance. Our findings allow for further tunability in experiments with ultracold $^{40}\mathrm{K}$ quantum gases.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-04-03 | Physical Review A |