Group Seminar at MPQ and via Zoom: Creating Ultracold Gases of Dipolar NaCs Ground State Molecules
Sebastian Will, Columbia University
Group Seminar at MPQ in the Herbert-Walther-Lecture Hall and via zoom
Tuesday, July 12, 9.00 (MEZ)
Ultracold dipolar molecules open up exciting prospects for quantum simulation, quantum computing, and quantum chemistry. The long-range dipole-dipole interactions between them offer new ways to engineer strongly correlated and highly entangled many-body quantum states. But creating and taming ensembles of ultracold molecules is not a routine task, yet. For example, the creation of a Bose-Einstein condensate of dipolar molecules, which will be useful for many applications, remains an outstanding challenge.In this talk, I will discuss our progress in the creation of ultracold gases of dipolar NaCs molecules in their rovibrational ground state. NaCs is bosonic and has a large dipole moment (4.6 Debye). Recently, we have produced overlapping Bose-Einstein condensates of Na and Cs , high phase-space density gases of NaCs Feshbach molecules , and created the first ultracold ensembles of NaCs ground state molecules via STIRAP . Most recently, we have started investigating rotational states via microwave spectroscopy and found exceptionally strong Rabi coupling between the rotational ground and first excited state (several tens of MHz), and I will discuss our progress towards microwave shielding in NaCs. NaCs presents us with an exciting opportunity to access novel phases of dipolar quantum matter.
 “Overlapping Bose-Einstein Condensates of Na and Cs,” C. Warner et al., Phys. Rev. A 104, 033302 (2021)
 “A High Phase-Space Density Gas of NaCs Feshbach Molecules,” A. Lam et al., Phys. Rev. Research 4, L022019 (2022)  “Ultracold Gases of Dipolar NaCs Ground State Molecules,” I. Stevenson et al. arXiv:2206.00652 (2022)