Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physical Review A

Dual-species Bose-Einstein condensates of Li7 and Cs133

Y.-D. Chen, W.-X. Li, Y.-T. Sun, Q. -C. Chen, Po-Yao Chang, Shih-Kuang Tung

Published Sep 1, 2023• 5 citations
Publisher

Abstract

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.

DOI
10.1103/physreva.108.033301

Related papers

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

Y.-D. Chen, W. -X. Li, Y.-T. Sun +3 more

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.

arXiv:2306.02698•Jun 5, 2023•0 citations

Dual-species Bose-Einstein condensates of $^{23}$Na and $^{41}$K with tunable interactions

Jaeryeong Chang, Sung‐Jun Lee, Yoonsoo Kim +2 more

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 $^{23}$Na$^{41}$K molecules as well as the exploration of many-body physics in bosonic $^{23}$Na-$^{41}$K mixtures.

arXiv:2312.08186•Dec 13, 2023•0 citations

Dual-species Bose-Einstein condensates of Na23 and K41 with tunable interactions

Jaeryeong Chang, Sungjun Lee, Yoonsoo Kim +2 more

We report the creation of dual-species Bose-Einstein condensates (BECs) of Na23 and K41 . Favorable background scattering lengths enable efficient sympathetic cooling of K41 via forced evaporative cooling of Na23 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 3×105 Na23 atoms surrounding 5×104 K41 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 Na23K41 molecules as well as the exploration of many-body physics in bosonic Na23−K41 mixtures. Published by the American Physical Society 2024

Physical Review Research•Feb 20, 2024•4 citations

Dual-species Bose-Einstein condensate of Rb87 and Cs133

Daniel McCarron, H. W. Cho, Daniel L. Jenkin +2 more

We report the formation of a dual-species Bose-Einstein condensate of $^{87}\mathrm{Rb}$ and $^{133}\mathrm{Cs}$ in the same trapping potential. Our method exploits the efficient sympathetic cooling of $^{133}\mathrm{Cs}$ via elastic collisions with $^{87}\mathrm{Rb}$, initially in a magnetic quadrupole trap and subsequently in a levitated optical trap. The two condensates each contain up to $2\ifmmode\times\else\texttimes\fi{}{10}^{4}$ atoms and exhibit a striking phase separation, revealing the mixture to be immiscible due to strong repulsive interspecies interactions. Sacrificing all the $^{87}\mathrm{Rb}$ during the cooling, we create single-species $^{133}\mathrm{Cs}$ condensates of up to $6\ifmmode\times\else\texttimes\fi{}{10}^{4}$ atoms.

arXiv:1102.1576•Physical Review A•Jul 13, 2011•232 citations

Quantum Degenerate Mixtures of Cs and Yb

Kali Wilson, Alexander Guttridge, Segal, J. +1 more

We report the production of quantum degenerate Bose-Bose mixtures of Cs and Yb with both attractive (Cs + 174Yb) and repulsive (Cs + 170Yb) interspecies interactions. Dual-species evaporation is performed in a bichromatic optical dipole trap that combines light at 1070 nm and 532 nm to enable control of the relative trap depths for Cs and Yb. Maintaining a trap which is shallower for Yb throughout the evaporation leads to highly efficient sympathetic cooling of Cs for both isotopic combinations at magnetic fields close to the Efimov minimum in the Cs three-body recombination rate at around 22 G. For Cs + 174Yb, we produce quantum mixtures with typical atom numbers of NYb ∼ 5 × 104 and NCs ∼ 5 × 103. We find that the attractive interspecies interaction (characterized by the scattering length aCsYb = −75a0) is stabilized by the repulsive intraspecies interactions. For Cs + 170Yb, we produce quantum mixtures with typical atom numbers of NYb ∼ 4 × 104 and NCs ∼ 1 × 104. Here, the repulsive interspecies interaction (aCsYb = 96a0) can overwhelm the intraspecies interactions, such that the mixture sits in a region of partial miscibility

•Mar 9, 2021•26 citations

Production of dual species Bose–Einstein condensates of 39K and 87Rb*

Cheng-Dong Mi, Khan Sadiq Nawaz, Peng-Jun Wang +4 more

We report the production of 39K and 87Rb Bose–Einstein condensates (BECs) in the lowest hyperfine states | F = 1,mF = 1 〉 simultaneously. We collect atoms in bright/dark magneto-optical traps (MOTs) of 39K/87Rb to overcome the light-assisted losses of 39K atoms. Gray molasses cooling on the D1 line of the 39K is used to effectively increase the phase density, which improves the loading efficiency of 39K into the quadrupole magnetic trap. Simultaneously, the normal molasses is employed for 87Rb. After the microwave evaporation cooling on 87Rb in the optically plugged magnetic trap, the atoms mixture is transferred to a crossed optical dipole trap, where the collisional properties of the two species in different combinations of the hyperfine states are studied. The dual species BECs of 39K and 87Rb are obtained by further evaporative cooling in an optical dipole trap at a magnetic field of 372.6 G with the background repulsive interspecies scattering length a KRb = 34 a 0 (a 0 is the Bohr radius) and the intraspecies scattering length a K = 20.05a 0.

arXiv:2104.09728•Chinese Physics B•Mar 15, 2021•6 citations
We report the creation of dual-species Bose-Einstein condensates (BECs) of 7Li^{7}\mathrm{Li}7Li and 133Cs^{133}\mathrm{Cs}133Cs. 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 aCs=123a0,aLi=484a0{a}_{\mathrm{Cs}}=123{a}_{0}, {a}_{\mathrm{Li}}=484{a}_{0}aCs​=123a0​,aLi​=484a0​, and aLiCs=248a0{a}_{\mathrm{LiCs}}=248{a}_{0}aLiCs​=248a0​. These scattering lengths allow for efficient evaporation and sympathetic cooling. The dual-species BECs are typically produced with 1.5\ifmmode×\else\texttimes\fi1041.5\ifmmode\times\else\texttimes\fi{}{10}^{4}1.5\ifmmode×\else\texttimes\fi104 Cs atoms and 6.0\ifmmode×\else\texttimes\fi1036.0\ifmmode\times\else\texttimes\fi{}{10}^{3}6.0\ifmmode×\else\texttimes\fi103 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 7^{7}7Li and 133^{133}133Cs
We report the creation of dual-species Bose-Einstein condensates (BECs) of 7^{7}7Li and 133^{133}133Cs. 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 aCs=123a0a_{\rm{Cs}} = 123a_0aCs​=123a0​, aLi=484a0a_{\rm{Li}} = 484a_0aLi​=484a0​, and aLiCs=248a0a_{\rm{LiCs}} = 248a_0aLiCs​=248a0​. These scattering lengths allow for efficient evaporation and sympathetic cooling. The dual-species BECs are typically produced with 1.5×1041.5\times 10^41.5×104 Cs atoms and 6.0×1036.0\times 10^36.0×103 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^{23}23Na and 41^{41}41K with tunable interactions
We report the creation of dual-species Bose-Einstein condensates (BECs) of 23^{23}23Na and 41^{41}41K. Favorable background scattering lengths enable efficient sympathetic cooling of 41^{41}41K via forced evaporative cooling of 23^{23}23Na in a plugged magnetic trap and an optical dipole trap. The 1/e1/e1/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 3×1053\times10^53×105 23^{23}23Na atoms surrounding 5×1045\times10^45×104 41^{41}41K 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 sss-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^{23}23Na41^{41}41K molecules as well as the exploration of many-body physics in bosonic 23^{23}23Na-41^{41}41K mixtures.
We report the creation of dual-species Bose-Einstein condensates (BECs) of Na23 and K41 . Favorable background scattering lengths enable efficient sympathetic cooling of K41 via forced evaporative cooling of Na23 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 3×105 Na23 atoms surrounding 5×104 K41 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 Na23K41 molecules as well as the exploration of many-body physics in bosonic Na23−K41 mixtures. Published by the American Physical Society 2024
We report the formation of a dual-species Bose-Einstein condensate of 87Rb^{87}\mathrm{Rb}87Rb and 133Cs^{133}\mathrm{Cs}133Cs in the same trapping potential. Our method exploits the efficient sympathetic cooling of 133Cs^{133}\mathrm{Cs}133Cs via elastic collisions with 87Rb^{87}\mathrm{Rb}87Rb, initially in a magnetic quadrupole trap and subsequently in a levitated optical trap. The two condensates each contain up to $2\ifmmode\times\else\texttimes\fi{}{10}^{4}$ atoms and exhibit a striking phase separation, revealing the mixture to be immiscible due to strong repulsive interspecies interactions. Sacrificing all the 87Rb^{87}\mathrm{Rb}87Rb during the cooling, we create single-species 133Cs^{133}\mathrm{Cs}133Cs condensates of up to $6\ifmmode\times\else\texttimes\fi{}{10}^{4}$ atoms.
We report the production of quantum degenerate Bose-Bose mixtures of Cs and Yb with both attractive (Cs + 174Yb) and repulsive (Cs + 170Yb) interspecies interactions. Dual-species evaporation is performed in a bichromatic optical dipole trap that combines light at 1070 nm and 532 nm to enable control of the relative trap depths for Cs and Yb. Maintaining a trap which is shallower for Yb throughout the evaporation leads to highly efficient sympathetic cooling of Cs for both isotopic combinations at magnetic fields close to the Efimov minimum in the Cs three-body recombination rate at around 22 G. For Cs + 174Yb, we produce quantum mixtures with typical atom numbers of NYb ∼ 5 × 104 and NCs ∼ 5 × 103. We find that the attractive interspecies interaction (characterized by the scattering length aCsYb = −75a0) is stabilized by the repulsive intraspecies interactions. For Cs + 170Yb, we produce quantum mixtures with typical atom numbers of NYb ∼ 4 × 104 and NCs ∼ 1 × 104. Here, the repulsive interspecies interaction (aCsYb = 96a0) can overwhelm the intraspecies interactions, such that the mixture sits in a region of partial miscibility
We report the production of 39K and 87Rb Bose–Einstein condensates (BECs) in the lowest hyperfine states | F = 1,mF = 1 〉 simultaneously. We collect atoms in bright/dark magneto-optical traps (MOTs) of 39K/87Rb to overcome the light-assisted losses of 39K atoms. Gray molasses cooling on the D1 line of the 39K is used to effectively increase the phase density, which improves the loading efficiency of 39K into the quadrupole magnetic trap. Simultaneously, the normal molasses is employed for 87Rb. After the microwave evaporation cooling on 87Rb in the optically plugged magnetic trap, the atoms mixture is transferred to a crossed optical dipole trap, where the collisional properties of the two species in different combinations of the hyperfine states are studied. The dual species BECs of 39K and 87Rb are obtained by further evaporative cooling in an optical dipole trap at a magnetic field of 372.6 G with the background repulsive interspecies scattering length a KRb = 34 a 0 (a 0 is the Bohr radius) and the intraspecies scattering length a K = 20.05a 0.