Li Ming, Petrov Alexander, Makrides Constantinos, Tiesinga Eite, Kotochigova Svetlana
Department of Physics, Temple University, Philadelphia, PA 19122-6082, USA.
St. Petersburg Nuclear Physics Institute, Gatchina, 188300; Division of Quantum Mechanics, St. Petersburg State University, 198904, Russia.
Phys Rev A (Coll Park). 2017 Jun;95(6). doi: 10.1103/PhysRevA.95.063422. Epub 2017 Jun 26.
We theoretically investigate trapping conditions for ultracold polar molecules in optical lattices, when external magnetic and electric fields are simultaneously applied. Our results are based on an accurate electronic-structure calculation of the polar NaK polar molecule in its absolute ground state combined with a calculation of its rovibrational-hyperfine motion. We find that an electric field strength of 5.26(15) kV/cm and an angle of 54.7° between this field and the polarization of the optical laser lead to a trapping design for NaK molecules where decoherences due laser-intensity fluctuations and fluctuations in the direction of its polarization are kept to a minimum. One standard deviation systematic and statistical uncertainties are given in parenthesis. Under such conditions pairs of hyperfine-rotational states of = 0 molecules, used to induce tunable dipole-dipole interactions between them, experience ultrastable, matching trapping forces.
我们从理论上研究了在同时施加外部磁场和电场时，超冷极性分子在光学晶格中的捕获条件。我们的结果基于对处于绝对基态的极性NaK分子进行精确的电子结构计算，并结合其振转超精细运动的计算。我们发现，电场强度为5.26(15) kV/cm，且该电场与光学激光偏振方向之间的夹角为54.7°，这导致了一种针对NaK分子的捕获设计，其中由于激光强度波动及其偏振方向波动引起的退相干被保持在最低水平。括号中给出了一个标准偏差的系统和统计不确定性。在这种条件下，用于诱导它们之间可调谐偶极-偶极相互作用的(F = 0)分子的超精细旋转态对，会经历超稳定的、匹配的捕获力。
