Anisotropic Polarizability of Ultracold Polar ${}^{40}$K${}^{87}$Rb Molecules

Abstract

We report the measurement of the anisotropic AC polarizability of ultracold polar ${}^{40}$K${}^{87}$Rb molecules in the ground and first rotationally excited states. Theoretical analysis of the polarizability agrees well with experimental findings. Although the polarizability can vary by more than 30%, a "magic" angle between the laser polarization and the quantization axis is found where the polarizability of the $|N=0,m_N=0>$ and the $|N=1,m_N=0>$ states match. At this angle, rotational decoherence due to the mismatch in trapping potentials is eliminated, and we observe a sharp increase in the coherence time. This paves the way for precise spectroscopic measurements and coherent manipulations of rotational states as a tool in the creation and probing of novel quantum many-body states of polar molecules.

4 pages for main text, 4 figures, 2 pages for supplementary information

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