Park Jee Woo, Will Sebastian A, Zwierlein Martin W
MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2015 May 22;114(20):205302. doi: 10.1103/PhysRevLett.114.205302. Epub 2015 May 18.
We report on the creation of an ultracold dipolar gas of fermionic 23Na40 K molecules in their absolute rovibrational and hyperfine ground state. Starting from weakly bound Feshbach molecules, we demonstrate hyperfine resolved two-photon transfer into the singlet X 1Σ+|v=0,J=0⟩ ground state, coherently bridging a binding energy difference of 0.65 eV via stimulated rapid adiabatic passage. The spin-polarized, nearly quantum degenerate molecular gas displays a lifetime longer than 2.5 s, highlighting NaK's stability against two-body chemical reactions. A homogeneous electric field is applied to induce a dipole moment of up to 0.8 D. With these advances, the exploration of many-body physics with strongly dipolar Fermi gases of 23Na40K molecules is within experimental reach.
我们报道了在绝对振转和超精细基态下制备出费米子23Na40K分子的超冷偶极气体。从弱束缚的费什巴赫分子出发，我们展示了超精细分辨的双光子转移到单重态X 1Σ+|v = 0,J = 0⟩基态，通过受激快速绝热通道相干地跨越了0.65 eV的结合能差。自旋极化的、近乎量子简并的分子气体表现出超过2.5 s的寿命，突出了NaK对双体化学反应的稳定性。施加均匀电场以诱导高达0.8 D的偶极矩。有了这些进展，利用23Na40K分子的强偶极费米气体探索多体物理已在实验可及范围内。
