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MO: Fachverband Molekülphysik

MO 7: Cold Molecules

MO 7.8: Vortrag

Dienstag, 15. März 2022, 12:15–12:30, MO-H8

Singlet Pathway to the Ground State of Ultracold Polar Molecules — Anbang Yang¹, Sofia Botsi¹, Sunil Kumar¹, Sambit B. Pal¹, Mark M. Lam¹, Ieva Cepaite¹, Andrew Laugharn¹, Victor A. Avalos Pinillos¹, Canming He¹, Xiaoyu Nie¹, and •Kai Dieckmann^1,2 — ¹Centre for Quantum Technologies, 3 Science Drive 2, 117543 Singapore — ²Department of Physics, National University of Singapore, 2 Science Drive 3, 117542 Singapore

Starting from weakly bound Feshbach molecules, we demonstrate a two-photon pathway to the dipolar ground state of bi-alkali molecules that involves only singlet-to-singlet optical transitions. This pathway eliminates the search for a suitable intermediate state with sufficient singlet-triplet mixing and the exploration of its hyperfine structure, as is typical for pathways starting from triplet dominated Feshbach molecules. By selecting a Feshbach state with a stretched singlet hyperfine component and controlling the laser polarizations, we assure coupling to only single hyperfine components of the A¹Σ⁺ excited potential and the X¹Σ⁺ rovibrational ground state. In this way an ideal three level system is established, even if the hyperfine structure is not resolved. We demonstrate this pathway with ⁶Li⁴⁰K molecules, and discuss our progress on its application to coherent transfer to the dipolar ground state.