Erlangen 2022 – wissenschaftliches Programm
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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 Dieckmann1,2 — 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.