Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Cold Molecules (joint session MO/A)

A 20.3: Vortrag

Mittwoch, 13. März 2019, 14:30–14:45, S HS 002 Biologie

The Dipolar Ground State of Ultracold LiK Molecules — •Sofia Botsi¹, Anbang Yang¹, Sunil Kumar¹, and Kai Dieckmann^1,2 — ¹Centre for Quantum Technologies, 3 Science Drive 2, 117543 Singapore — ²Depatment of Physics, National University of Singapore, 2 Science Drive 3, 117542 Singapore

Ultracold polar molecules are an ideal tool for the quantum simulation of a large class of many-body effects, for quantum information processing, controlled ultracold chemistry, and quantum metrological applications. We report on our experiments that identified the ground state of bosonic heteronuclear dimers of ⁶Li and ⁴⁰K. In the ground state these molecules possess a large permanent electric dipole moment of 3.6 Debye, which makes them a suitable candidate for a quantum gas with long-range anisotropic dipole interaction. Starting from closed channel dominated Feshbach molecules we describe a new spectroscopy route to the ground state that is different from schemes previously used for other alkali heteronuclear dimers. Only strong transitions between molecular spin singlet states are involved avoiding the need to identify suitable perturbed triplet states. We demonstrate how only a sole hyperfine component can be addressed, even if the hyperfine structure is not resolved. Effectively creating a three level system the resulting scheme is the most straight forward to date and takes full advantage of the closed molecular channel that can be discussed by means of the simple asymptotic bound state model for our case. Further, we present results from rotational spectroscopy that facilitates to exploit the high electric dipole moment for use of the molecules as a quantum bit.