Ultracold collisions of fermionic potassium in an optical dipole trap

We present an apparatus for producing ultracold Na- $$^{40}$$ K and Na- $$^{41}$$ K mixtures as a starting point for the formation of fermionic and bosonic ground-state NaK molecules. Sodium and potassium atoms are first loaded into a magneto-optical trap and transferred to an optically plugged magnetic trap, where the mixture undergoes sympathetic cooling via radio-frequency evaporation of Na. A key feature of the apparatus is its ability to switch between loading fermionic $$^{40}$$ K and bosonic $$^{41}$$ K by toggling three acousto-optic modulators. After further sympathetic cooling in an optical dipole trap, we obtain quantum-degenerate Bose–Fermi Na- $$^{40}$$ K and Bose–Bose Na- $$^{41}$$ K mixtures. This apparatus provides a robust starting point for creating ultracold Bose and Fermi gases of ground-state NaK molecules, opening pathways to explore strongly interacting dipolar quantum matter.

Journal of the Korean Physical SocietyJul 10, 20260 citations

Ultracold collisions of fermionic potassium in an optical dipole trap

Peter Hannaford

Published Jan 1, 2000• 0 citations

OpenAlex

Related papers

Ultracold Atomic Fermi–Bose Mixtures in Bichromatic Optical Dipole Traps: A Novel Route to Study Fermion Superfluidity

Roberto Onofrio, Carlo Presilla A

arXiv:cond-mat/0403612Journal of Statistical PhysicsMar 17, 200420 citations

Resonator-enhanced optical dipole trap for fermionic lithium atoms

Allard P. Mosk, Selim Jochim, Henning Moritz +3 more

We demonstrate a novel optical dipole trap that is based on enhancement of the optical power density of a Nd:YAG laser beam in a resonator. The trap is particularly suited for experiments with ultracold gases, as it combines a potential depth of the order of 1 mK with storage times of several tens of seconds. We study the interactions in a gas of fermionic lithium atoms in our trap and observe the influence of spin-changing collisions and off-resonant photon scattering. A key element in reaching long storage times is the use of an ultralow-noise laser. The dependence of storage time on laser noise is investigated.We demonstrate a novel optical dipole trap that is based on enhancement of the optical power density of a Nd:YAG laser beam in a resonator. The trap is particularly suited for experiments with ultracold gases, as it combines a potential depth of the order of 1 mK with storage times of several tens of seconds. We study the interactions in a gas of fermionic lithium atoms in our trap and observe the influence of spin-changing collisions and off-resonant photon scattering. A key element in reaching long storage times is the use of an ultralow-noise laser. The dependence of storage time on laser noise is investigated.

arXiv:physics/0105009Optics LettersDec 1, 200158 citations

Optical and Magnetic Trapping of Fermionic Potassium

Giovanni Carlo Modugno, G. Roati

Springer eBooksJan 1, 20020 citations

Ultracold collisions of mixed atoms in optical dipole trap loaded from a dark magneto-optical trap

Yanting Zhao, Ting Gong, Zhonghao Li +4 more

Abstract We study the cold collisions of mixed atoms in an optical dipole trap (ODT), which are loaded from a dark magneto-optical trap (MOT). A comprehensive, phenomenological rate equation is presented to derive the ultracold homonuclear and heteronuclear collision rates in loading and holding procedures. Our results show that the cold atoms in the dark MOT can provide a much better stable, initial atomic sample than MOT. The dependence of the heteronuclear collision rate on the trap depth is attributed to the hyperfine-changing collision by the ODT laser with a broad linewidth. The processes of deriving the collision rate are also universal for other kinds of atoms or even molecules.Abstract We study the cold collisions of mixed atoms in an optical dipole trap (ODT), which are loaded from a dark magneto-optical trap (MOT). A comprehensive, phenomenological rate equation is presented to derive the ultracold homonuclear and heteronuclear collision rates in loading and holding procedures. Our results show that the cold atoms in the dark MOT can provide a much better stable, initial atomic sample than MOT. The dependence of the heteronuclear collision rate on the trap depth is attributed to the hyperfine-changing collision by the ODT laser with a broad linewidth. The processes of deriving the collision rate are also universal for other kinds of atoms or even molecules.

Journal of Physics B Atomic Molecular and Optical PhysicsAug 31, 20170 citations

Collisional dynamics of ultracold Sr in an optical dipole trap

Mi Yan, Y. N. Martinez de Escobar, Pascal G. Mickelson +1 more

Bulletin of the American Physical SocietyMay 23, 20091 citation

An apparatus for ultracold Na- $^{40/41}$ K mixtures toward ground-state molecule productionAn apparatus for ultracold Na-$$^{40/41}$$K mixtures toward ground-state molecule production

Jaeryeong Chang, Sungjun Lee, Yoonsoo Kim +5 more

We present an apparatus for producing ultracold Na- $^{40}$ K and Na- $^{41}$ K mixtures as a starting point for the formation of fermionic and bosonic ground-state NaK molecules. Sodium and potassium atoms are first loaded into a magneto-optical trap and transferred to an optically plugged magnetic trap, where the mixture undergoes sympathetic cooling via radio-frequency evaporation of Na. A key feature of the apparatus is its ability to switch between loading fermionic $^{40}$ K and bosonic $^{41}$ K by toggling three acousto-optic modulators. After further sympathetic cooling in an optical dipole trap, we obtain quantum-degenerate Bose–Fermi Na- $^{40}$ K and Bose–Bose Na- $^{41}$ K mixtures. This apparatus provides a robust starting point for creating ultracold Bose and Fermi gases of ground-state NaK molecules, opening pathways to explore strongly interacting dipolar quantum matter.We present an apparatus for producing ultracold Na- $$^{40}$$ K and Na- $$^{41}$$ K mixtures as a starting point for the formation of fermionic and bosonic ground-state NaK molecules. Sodium and potassium atoms are first loaded into a magneto-optical trap and transferred to an optically plugged magnetic trap, where the mixture undergoes sympathetic cooling via radio-frequency evaporation of Na. A key feature of the apparatus is its ability to switch between loading fermionic $$^{40}$$ K and bosonic $$^{41}$$ K by toggling three acousto-optic modulators. After further sympathetic cooling in an optical dipole trap, we obtain quantum-degenerate Bose–Fermi Na- $$^{40}$$ K and Bose–Bose Na- $$^{41}$$ K mixtures. This apparatus provides a robust starting point for creating ultracold Bose and Fermi gases of ground-state NaK molecules, opening pathways to explore strongly interacting dipolar quantum matter.

Journal of the Korean Physical SocietyJul 10, 20260 citations

An apparatus for ultracold Na-

^{40/41}

K mixtures toward ground-state molecule production

We present an apparatus for producing ultracold Na-

^{40}

K and Na-

^{41}

K mixtures as a starting point for the formation of fermionic and bosonic ground-state NaK molecules. Sodium and potassium atoms are first loaded into a magneto-optical trap and transferred to an optically plugged magnetic trap, where the mixture undergoes sympathetic cooling via radio-frequency evaporation of Na. A key feature of the apparatus is its ability to switch between loading fermionic

^{40}

K and bosonic

^{41}

K by toggling three acousto-optic modulators. After further sympathetic cooling in an optical dipole trap, we obtain quantum-degenerate Bose–Fermi Na-

^{40}

K and Bose–Bose Na-

^{41}

K mixtures. This apparatus provides a robust starting point for creating ultracold Bose and Fermi gases of ground-state NaK molecules, opening pathways to explore strongly interacting dipolar quantum matter.