Production of large<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">K</mml:mi><mml:mprescripts /><mml:none /><mml:mn>41</mml:mn></mml:mmultiscripts></mml:math>Bose-Einstein condensates using<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>D</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math>gray molasses

Chen, Hao-Ze; Yao, Xing-Can; Wu, Yuping; Liu, Xiang-Pei; Wang, Xiaoqiong; Wang, Yu-Xuan; Chen, Yu-Ao; Pan, Jian-Wei

doi:10.1103/physreva.94.033408

Cited by 33 publications

(28 citation statements)

References 32 publications

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“…Although there are other cooling schemes, such as degenerate Raman sideband cooling [23] that allows one to cool atoms to sub-µK temperature, they require more lasers and a relatively complicated setup. RGMC provides a simple and effective way to increase the phase space density of the atoms, which facilitates the loading into optical dipole traps for further cooling to quantum degeneracies [15,21]. In this paper, we report the RGMC of 133 Cs to 1.7±0.2 µK with a capture efficiency of >80 % with an initial atom number of 3.7×10 8 .…”

Section: Introductionmentioning

confidence: 89%

“…It is usually considered that sub-Doppler cooling could be ineffective for the D 2 transition of lithium and potassium, especially their bosonic isotopes, due to the narrow excited-state structure [9]. However, more careful studies show that one can achieve the sub-Doppler temperature by sophisticated dynamic control of the intensity and detuning of the cooling and repumping lasers [10,11] [21], and 87 Rb [22]. In most of the works with Li, K and Na, the RGMC were implemented with the D 1 or the D 2 transition which have well-separated hyperfine spacing.…”

Section: Introductionmentioning

confidence: 99%

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Λ -enhanced gray-molasses cooling of cesium atoms on the D2 line

2018

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We present a systematic study on the Raman gray molasses cooling (RGMC) of cesium atoms on the D2 transition. Due to the large splitting in the excited hyperfine transitions of cesium D2 line, it is relatively simple to implement the RGMC with suitable frequency control on the trapping and repumping lasers of the magneto-optical trap (MOT). We have achieved an atom temperature of 1.7±0.2 µK after the RGMC with 3.2 × 10 8 atoms. The phase space density is 1.43 × 10 −4 . Compared to the condition with a bare MOT or the MOT with a standard polarization gradient cooling, the phase space density increases by a factor of more than 10 3 or 10, respectively.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Λ -enhanced gray-molasses cooling of cesium atoms on the D2 line

2018

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“…The experimental procedure for preparing the 6 Li-41 K mixture is similar to our previous works [9,30,31]. After the laser cooling and magnetic transport phase, both the 6 Li and 41 K atoms are confined in an opticallyplugged magnetic trap for evaporative cooling.…”

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confidence: 99%

Observation of state-to-state hyperfine-changing collisions in a Bose-Fermi mixture of Li6 and K41 atoms

Wang

Liu

et al. 2020

Phys. Rev. A

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Hyperfine-changing collisions are of fundamental interest for the studying of ultracold heteronuclear mixtures. Here, we report the state-to-state study of the hyperfine-changing-collision dynamics in a Bose-Fermi mixture of 6 Li and 41 K atoms. The collision products are directly observed and the spin-changing dynamics is measured. Based on a two-body collision model, the experimental results are simultaneously fitted from which the spin-changing rate coefficient of 1.9(2) × 10 −12 cm 3 · s −1 is gained, being consistent with the multi-channel quantum defect theory calculation. We further show that the contact parameter of 6 Li-41 K mixture can be extracted from the measured spin-changing dynamics. The obtained results are consistent with the first order perturbation theory in the weakly-interacting limit. Our system offers great promise for studying spin-changing interactions in heteronuclear mixtures. arXiv:2001.11652v1 [cond-mat.quant-gas] 31 Jan 2020

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“…Observation of d-wave Resonance. The experimental setup for preparing ultracold 41 K gas has been described in our previous works [26][27][28]. Up to 7 × 10 5 41 K atoms in the |F = 1, m F = 1 hyperfine state can be cooled to form a pure condensate at magnetic field 304.5 G. The 41 K Bose-Einstein condensate (BEC) is confined in a disk-like trap with radial and axial trapping frequencies being ω r = 20.8 Hz and ω a = 84 Hz, respectively.…”

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confidence: 99%

Degenerate Bose gases near a d-wave shape resonance

Yao

Liu

et al. 2019

Nat. Phys.

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Many unconventional quantum matters, such as fractional quantum Hall effect and d-wave high-Tc superconductor, are discovered in strongly interacting systems. Understanding quantum many-body systems with strong interaction and the unconventional phases therein is one of the most challenging problems in physics nowadays. Cold atom systems possess a natural way to create strong interaction by bringing the system to the vicinity of a scattering resonance. Although this has been a focused topic in cold atom physics for more than a decade, these studies have so far mostly been limited for s-wave resonance. Here we report the experimental observation of a broad d-wave shape resonance in degenerate 41 K gas. We further measure the molecular binding energy that splits into three branches as a hallmark of d-wave molecules, and find that the lifetime of this many-body system is reasonably long at strongly interacting regime. From analyzing the breathing mode excited by ramping through this resonance, it suggests that a quite stable low-temperature atom and molecule mixture is produced. Putting all the evidence together, our system offers great promise to reach a d-wave molecular superfluid.

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Production of largeK41Bose-Einstein condensates usingD1gray molasses

Cited by 33 publications

References 32 publications

Λ -enhanced gray-molasses cooling of cesium atoms on the D2 line

Λ -enhanced gray-molasses cooling of cesium atoms on the D2 line

Observation of state-to-state hyperfine-changing collisions in a Bose-Fermi mixture of Li6 and K41 atoms

Degenerate Bose gases near a d-wave shape resonance

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