arXiv:1606.09404 · Journal of Physics B Atomic Molecular and Optical Physics

All-optical production of dual Bose–Einstein condensates of paired fermions and bosons with 6 Li and 7 Li

Takuya Ikemachi, Aki Ito, Yukihito Aratake, Yiping Chen, Masato Koashi, Makoto Kuwata‐Gonokami, Munekazu Horikoshi

Published Dec 15, 2016• 23 citations

Abstract

Abstract We report the first all-optical production of dual Bose–Einstein condensates (BECs) of paired 6 Li (fermion) and one spin state of 7 Li (boson) at the magnetic field where the s -wave interactions between fermions are resonant. Fermions are cooled efficiently by evaporative cooling and they serve as coolant for bosons. As a result, the dual condensates can be achieved by using a simple experimental apparatus and procedures, as in the case of the all-optical production of a single BEC. We show that the all-optical method enables us to realize variety of ultracold Bose–Fermi mixtures.

DOI: 10.1088/1361-6455/50/1/01lt01

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arXiv:1606.09404 · Journal of Physics B Atomic Molecular and Optical Physics

All-optical production of dual Bose–Einstein condensates of paired fermions and bosons with 6 Li and 7 Li

Takuya Ikemachi, Aki Ito, Yukihito Aratake, Yiping Chen, Masato Koashi, Makoto Kuwata‐Gonokami, Munekazu Horikoshi

Published Dec 15, 2016• 23 citations

arXiv HTML PDF

Abstract

DOI: 10.1088/1361-6455/50/1/01lt01

Related papers

Dual-species Bose-Einstein condensates of $^{7}$ Li and $^{133}$ CsDual-species Bose-Einstein condensates of $^{7}$Li and $^{133}$Cs

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Dual-species Bose-Einstein condensates of

^{7}

Li and

^{133}

We report the creation of dual-species Bose-Einstein condensates (BECs) of

^{7}

Li and

^{133}

Cs. These BECs are formed in a bichromatic optical dipole trap created with 1550-nm and 780-nm laser beams. During the production process, an external magnetic field of 886~G is applied to adjust the scattering lengths to

a_{\rm{Cs}} = 123a_0

a_{\rm{Li}} = 484a_0

, and

a_{\rm{LiCs}} = 248a_0

. These scattering lengths allow for efficient evaporation and sympathetic cooling. The dual-species BECs are typically produced with

1.5\times 10^4

Cs atoms and

6.0\times 10^3

Li atoms. This quantum degenerate mixture of Li and Cs provides an ideal platform for exploring phenomena such as polarons and Efimov trimers, as well as for creating ground-state LiCs molecules.

We report the creation of dual-species Bose-Einstein condensates (BECs) of

^{7}\mathrm{Li}

and

^{133}\mathrm{Cs}

. These BECs are formed in a bichromatic optical dipole trap created with 1550- and 780-nm laser beams. During the production process, an external magnetic field of 886 G is applied to adjust the scattering lengths to

{a}_{\mathrm{Cs}}=123{a}_{0}, {a}_{\mathrm{Li}}=484{a}_{0}

, and

{a}_{\mathrm{LiCs}}=248{a}_{0}

. These scattering lengths allow for efficient evaporation and sympathetic cooling. The dual-species BECs are typically produced with $1.5\ifmmode\times\else\texttimes\fi{}{10}^{4}$ Cs atoms and $6.0\ifmmode\times\else\texttimes\fi{}{10}^{3}$ Li atoms. This quantum degenerate mixture of Li and Cs provides an ideal platform for exploring phenomena such as polarons and Efimov trimers, as well as for creating ground-state LiCs molecules.

Dual-species Bose-Einstein condensates of

^{23}

Na and

^{41}

K with tunable interactions

We report the creation of dual-species Bose-Einstein condensates (BECs) of

^{23}

Na and

^{41}

K. Favorable background scattering lengths enable efficient sympathetic cooling of

^{41}

K via forced evaporative cooling of

^{23}

Na in a plugged magnetic trap and an optical dipole trap. The

1/e

lifetime of the thermal mixture in the stretched hyperfine state exceeds 5 s in the presence of background scattering. At the end of evaporation, we create dual BECs in the immiscible phase, with about

3\times10^5

^{23}

Na atoms surrounding

5\times10^4

^{41}

K atoms. To further enable the tuning of the interspecies interaction strength, we locate multiple Feshbach resonances at magnetic fields up to 100 G. The broadest

s

-wave resonance located at 73.4(3) G features a favorable width of 1.8(2) G. This work sets the stage for the creation of ultracold gases of strongly dipolar bosonic

^{23}

^{41}

K molecules as well as the exploration of many-body physics in bosonic

^{23}

Na-

^{41}

K mixtures.