A high phase-space-density gas of polar molecules
A high phase-space-density gas of polar molecules
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DOI：
10.1126/science.1163861
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发表时间：
2008-10-10
期刊：
影响因子：
56.9
通讯作者：
Ye, J.
中科院分区：
文献类型：
--
作者：
Ni, K. -K.;Ospelkaus, S.;Ye, J.
具有长程和各向异性相互作用的超冷极性分子的量子气体，不仅可以探索一大类多体物理现象，而且可以用于量子信息处理。我们报道了钾铷（40）K（87）Rb）极性分子超冷致密气体的产生。利用双频激光照射下的STIRAP（受激拉曼绝热通道）单步骤，我们将极弱束缚的KRb分子相干转移到三重态或单重态电子基态分子势的振转基态。极性分子气体具有每立方厘米10（12）的峰值密度和350纳凯的膨胀确定的平移温度。极性分子有一个永久的电偶极矩，我们用斯塔克光谱测量，三重态振转基态的电偶极矩为0.052（2）德拜（1德拜= 3.336 × 10（-30）库仑米），单重态振转基态的电偶极矩为0.566（17）德拜。
A quantum gas of ultracold polar molecules, with long-range and anisotropic interactions, not only would enable explorations of a large class of many-body physics phenomena but also could be used for quantum information processing. We report on the creation of an ultracold dense gas of potassium-rubidium ((40)K(87)Rb) polar molecules. Using a single step of STIRAP (stimulated Raman adiabatic passage) with two-frequency laser irradiation, we coherently transfer extremely weakly bound KRb molecules to the rovibrational ground state of either the triplet or the singlet electronic ground molecular potential. The polar molecular gas has a peak density of 10(12) per cubic centimeter and an expansion-determined translational temperature of 350 nanokelvin. The polar molecules have a permanent electric dipole moment, which we measure with Stark spectroscopy to be 0.052(2) Debye (1 Debye = 3.336 x 10(-30) coulomb-meters) for the triplet rovibrational ground state and 0.566(17) Debye for the singlet rovibrational ground state.