Fast production of 87Rb Bose-Einstein condensates

Chen, Liangchao; Meng, Ziqiang; Wang, Pengjun

doi:10.7498/aps.66.083701

Cited by 4 publications

(1 citation statement)

References 54 publications

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“…1, which has been used for the creation of 87 Rb BEC in Refs. [40,41]. The 87 Rb and 39 K atoms are first simultaneously cooled and trapped in the 2D MOT chamber to form an atomic beam.…”

Section: The 39 K and 87 Rb Double Motmentioning

confidence: 99%

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

Mi¹,

Nawaz²,

Wang³

et al. 2021

Chinese Phys. B

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We report the production of 39 K and 87 Rb 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 39 K/ 87 Rb to overcome the light-assisted losses of 39 K atoms. Gray molasses cooling on the D1 line of the 39 K is used to effectively increase the phase density, which improves the loading efficiency of 39 K into the quadrupole magnetic trap. Simultaneously, the normal molasses are employed for 87 Rb. After the microwave evaporation cooling on 87 Rb 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 39 K and 87 Rb are obtained by further evaporative cooling in optical dipole trap at a magnetic field of 372.6 G with the background repulsive interspecies scattering length a KRb = 34 a0 (a0 is the Bohr radius) and the intraspecies scattering length aK = 20.05 a0.

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“…1, which has been used for the creation of 87 Rb BEC in Refs. [40,41]. The 87 Rb and 39 K atoms are first simultaneously cooled and trapped in the 2D MOT chamber to form an atomic beam.…”

Section: The 39 K and 87 Rb Double Motmentioning

confidence: 99%

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

Mi¹,

Nawaz²,

Wang³

et al. 2021

Chinese Phys. B

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Production of ²³Na Bose–Einstein condensates in the F = 2 state using D₂ gray molasses

Shi

Wang

et al. 2021

J. Opt. Soc. Am. B

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We report on the production of Bose–Einstein condensates of sodium atoms in the hyperfine state | F = 2 , m F = 2 ⟩ in a crossed optical dipole trap using D 2 gray molasses. We use the gray molasses sub-Doppler cooling technique to obtain an atomic sample of 3 × 10 8 at 56 µK. After the radio frequency (RF) evaporation cooling in an optically plugged magnetic trap, we transfer the atoms sample of 2.5 × 10 6 at 5.7 µK to a crossed optical dipole trap where a pure condensate with an atom number of 2 × 10 5 and lifetime of 6.3 s is obtained by further evaporation. We compare the cooling process of sodium atoms in the | 2 , 2 ⟩ and the | 1 , 1 ⟩ states by evaporation in the optical trap, and also observe the different three-body loss rates by the lifetime measurement.

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Quantum vortex phenomenon of many sub-Bose-Einstein condensations formed by expansion and superposition

Bi-Yuan¹,

Xu²

2018

Acta Phys. Sin.

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Based on the two-dimensional model, the formation mechanism of quantum vortex by the expansions and superpositions of the many sub-Bose-Einstein condensations (BECs) in the weak harmonic trap is studied. In the harmonic approximation, the initial wave function of the sub-BEC is Gaussian function. Once the initial wave function is known, by using the propagation method, the time evolution of the wave function for the sub-BECs could be obtained. The physical processes of the macroscopic quantum vortex formed by the symmetric distribution of the three sub-BEC expansions and superpositions are analyzed, and the law of quantum vortex with time evolution is obtained. It is found that the vortex distribution is oscillatory in the harmonic trap, and vortex and anti-vortex are mutually transformed in time. At the same time of evolution, the vortex direction is always opposite to that of the neighbor vortex, and at different evolutionary times t and t', which satisfy a relation of t+t'=T (period of harmonic trap), the position of vortex nucleus is unchanged, but the vortex is transformed into the anti-vortex. These basic phenomena of quantum vortex are explained and discussed. In particular, in this paper we also introduce the particle flow density, calculate the flow circulation of our system, and analyze the mechanism of vortex formation. The research ideas and methods in this paper are easily to be extended to the study about the vortex formed by more than three sub-BEC expansions and superpositions, and they can also be used to discuss the effects of sub-BECs with different initial phase differences. This model is also easier to implement in experiment. Therefore, the research of this paper also has enlightenment to the experimental work.

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Fast production of 87Rb Bose-Einstein condensates

Cited by 4 publications

References 54 publications

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

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

Production of ²³Na Bose–Einstein condensates in the F = 2 state using D₂ gray molasses

Quantum vortex phenomenon of many sub-Bose-Einstein condensations formed by expansion and superposition

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Fast production of 87Rb Bose-Einstein condensates

Cited by 4 publications

References 54 publications

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

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

Production of 23Na Bose–Einstein condensates in the F = 2 state using D2 gray molasses

Quantum vortex phenomenon of many sub-Bose-Einstein condensations formed by expansion and superposition

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

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

Production of ²³Na Bose–Einstein condensates in the F = 2 state using D₂ gray molasses