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Poster Session

Poster Session III

4:00 pm – 6:00 pm, Thursday June 19 Session S00 Oregon Convention Center:, Exhibit Hall E
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Rotational Spectroscopy and Magic 3D Optical Lattices for Ultracold 6Li40K Molecules

Poster 19
Presenter: Xiaoyu Nie (Center for Quantum Technologies, Natl Univ of Singapore)
Authors: Anbang Yang (Center for Quantum Technologies, Natl Univ of Singapore), Victor Andre Avalos Pinillos (Center for Quantum Technologies, Natl Univ of Singapore), Hao Lin Yu (Center for Quantum Technologies, Natl Univ of Singapore), Yiming Liu (Center for Quantum Technologies, Natl Univ of Singapore), Canming He (Center for Quantum Technologies, Natl Univ of Singapore), Jacek Klos (Temple University), Svetlana Kotochigova (Temple University), Kai Dieckmann (Center for Quantum Technologies, Natl Univ of Singapore)

We report highly-resolved rotational spectroscopy of ultracold 6Li40K molecules, search for the magic condition via b3Π transition, and the extension of molecule coherence time in the magic 3D optical lattices.

We first present rotational spectroscopy of the J=1 hyperfine structure at 215.5 G. By analyzing transition frequencies to excited states, we extract hyperfine interaction constants. One stretched transition is further narrowed down to Hz-level resolution, and the coherence time in a 1070nm optical dipole trap is measured, with the coherence timescale of approximately 10 microseconds.

 

To extend the coherence time, frequency-dependent polarizability calculations for the ground and first rotational excited states of 6Li40K are conducted. Via spin-orbital coupling between a1Σ and b3Π, we found the transition of |b3Π, v=0, J=1> from ground state molecules at 314.2305 THz. We further experimentally calibrated the feature in the polarizability spectra, particularly in the vicinity of a broad and far-detuned magic wavelength where the differential light shift remains negligible across the trap. Magic points occur at -8.9 GHz (90 deg laser polarization) and +6.8 GHz (0 deg laser polarization) away from the nearest transition. At the magic points, polarizability change within 1kHz by varying laser intensity from 0 to 9 kW/cm2. We further built up a 3D magic optical lattice. The fine tuning of the coherence optimization via magic frequency is ongoing.

Funding acknowledgement

This research is supported by the National Research Foundation, Singapore and A*STAR under its CQT Bridging Grant. We further acknowledge funding by the Singapore Ministry of Education Academic Research Fund Tier 2 (Grant No. MOE2015-T2-1-098).

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