論文 - 原　秀明

Photoassociative production of ultracold heteronuclear ytterbium molecules 査読

Mateusz Borkowski, Roman Ciurylo, Paul S. Julienne, Rekishu Yamazaki, Hideaki Hara, Katsunari Enomoto, Shintaro Taie, Seiji Sugawa, Yosuke Takasu, Yoshiro Takahashi

PHYSICAL REVIEW A   84 ( 3 )   2011年9月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER PHYSICAL SOC  

We report observations of photoassociation (PA) spectra near the intercombination line in isotopic mixtures of ultracold ytterbium gases. Several heteronuclear bound states have been found for the excited (170)Yb(174)Yb and (174)Yb(176)Yb molecules. We develop a single-channel mass-scaled interaction model for the excited state molecule which well reproduces the measured bound state energies. This is an important step toward optical control of interactions in mixtures of ultracold ytterbium gases using heteronuclear optical Feshbach resonances. The model developed is applicable in collisions of other similar systems, such as cadmium and mercury.

DOI： 10.1103/PhysRevA.84.030702

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Quantum Degenerate Mixtures of Alkali and Alkaline-Earth-Like Atoms 査読

Hideaki Hara, Yosuke Takasu, Yoshifumi Yamaoka, John M. Doyle, Yoshiro Takahashi

PHYSICAL REVIEW LETTERS   106 ( 20 )   2011年5月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER PHYSICAL SOC  

We realize simultaneous quantum degeneracy in mixtures consisting of the alkali and alkaline earth like atoms Li and Yb. This is accomplished within an optical trap by sympathetic cooling of the fermionic isotope Li-6 with evaporatively cooled bosonic Yb-174 and, separately, fermionic Yb-173. Using cross-thermalization studies, we also measure the elastic s-wave scattering lengths of both Li-Yb combinations, vertical bar a(6Li-174Yb)vertical bar = 1.0 +/- 0.2 nmand vertical bar a(6Li-173Yb)vertical bar = 0.9 +/- 0.2 nm. The equality of these lengths is found to be consistent with massscaling analysis. The quantum degenerate mixtures of Li and Yb, as realized here, can be the basis for creation of ultracold molecules with electron spin degrees of freedom, studies of novel Efimov trimers, and impurity probes of superfluid systems.

DOI： 10.1103/PhysRevLett.106.205304

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Simultaneous magneto-optical trapping of lithium and ytterbium atoms towards production of ultracold polar molecules 査読

M. Okano, H. Hara, M. Muramatsu, K. Doi, S. Uetake, Y. Takasu, Y. Takahashi

APPLIED PHYSICS B-LASERS AND OPTICS   98 ( 4 )   691 - 696   2010年3月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：SPRINGER  

We have successfully implemented the first simultaneous magneto-optical trapping (MOT) of lithium ((6)Li) and ytterbium ((174)Yb) atoms towards production of ultracold polar molecules of LiYb. For this purpose, we developed the dual atomic oven which contains both atomic species as an atom source and successfully observed the spectra of the Li and Yb atoms in the atomic beams from the dual atomic oven. We constructed the vacuum chamber including the glass cell with the windows made of zinc selenium (ZnSe) for the CO(2) lasers, which are the useful light sources of optical trapping for evaporative and sympathetic cooling. Typical atom numbers and temperatures in the compressed MOT are 7x10(3) atoms, 640 mu K for (6)Li, 7x10(4) atoms, and 60 mu K for (174)Yb, respectively.

DOI： 10.1007/s00340-009-3728-0

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