Bulletin of the American Physical Society

Enhanced creation efficiency of polar molecules with a species-selective dipole trap

Bo Yan, Brian Neyenhuis, Steven A. Moses, Jacob P. Covey, Deborah Jin, Jun Ye

Published Jun 5, 2012• 0 citations

OpenAlex

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Bulletin of the American Physical Society

Enhanced creation efficiency of polar molecules with a species-selective dipole trap

Bo Yan, Brian Neyenhuis, Steven A. Moses, Jacob P. Covey, Deborah Jin, Jun Ye

Published Jun 5, 2012• 0 citations

OpenAlex

Related papers

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A quantum degenerate mixture of ⁸⁷Rb and ¹³³Cs

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This thesis reports the formation of a dual-species Bose-Einstein condensate of $^{87}$ Rb and $^{133}$ Cs in the same trapping potential. Quantum degenerate mixtures exhibit rich physics inaccessible to single species experiments and provide an ideal starting point for the creation of ultracold dipolar molecules. These molecules offer a wealth of new research avenues including precision metrology, quantum simulation and computation. The experimental method exploits the efficient sympathetic cooling of $^{133}$ Cs via elastic collisions with $^{87}$ Rb, initially in a magnetic quadrupole trap and subsequently in a levitated optical trap. Evaporative cooling in the dipole trap must compete against a high interspecies three-body inelastic collision rate \mbox{ $\sim10^{-25}-10^{-26}$ ~cm $^{6}/$ s}. The two condensates each contain up to \mbox{ $2\times10^{4}$ } atoms and exhibit a striking phase separation, revealing the mixture to be immiscible due to strong repulsive interspecies interactions. Sacrificing all the $^{87}$ Rb during the cooling leads to the creation of single-species $^{133}$ Cs condensates of up to \mbox{ $6\times10^{4}$ } atoms. In addition this thesis reports the observation of an interspecies Feshbach resonance at 181.7(5)~G and the creation of a pure sample of Cs $_{2}$ molecules via magneto-association on the 4(g)4 resonance at 19.8~G. These results represent important steps towards the creation of ultracold polar RbCs molecules.This thesis reports the formation of a dual-species Bose-Einstein condensate of $^{87}$Rb and $^{133}$Cs in the same trapping potential. Quantum degenerate mixtures exhibit rich physics inaccessible to single species experiments and provide an ideal starting point for the creation of ultracold dipolar molecules. These molecules offer a wealth of new research avenues including precision metrology, quantum simulation and computation. The experimental method exploits the efficient sympathetic cooling of $^{133}$Cs via elastic collisions with $^{87}$Rb, initially in a magnetic quadrupole trap and subsequently in a levitated optical trap. Evaporative cooling in the dipole trap must compete against a high interspecies three-body inelastic collision rate \mbox{$\sim10^{-25}-10^{-26}$~cm$^{6}/$s}. The two condensates each contain up to \mbox{$2\times10^{4}$} atoms and exhibit a striking phase separation, revealing the mixture to be immiscible due to strong repulsive interspecies interactions. Sacrificing all the $^{87}$Rb during the cooling leads to the creation of single-species $^{133}$Cs condensates of up to \mbox{$6\times10^{4}$} atoms. In addition this thesis reports the observation of an interspecies Feshbach resonance at 181.7(5)~G and the creation of a pure sample of Cs$_{2}$ molecules via magneto-association on the 4(g)4 resonance at 19.8~G. These results represent important steps towards the creation of ultracold polar RbCs molecules.

Jan 1, 20110 citations

Efficient Creation of Ultracold Ground State $^{6}\textrm{Li}^{40}\textrm{K}$ Polar MoleculesEfficient Creation of Ultracold Ground State $^{6}\textrm{Li}^{40}\textrm{K}$ Polar Molecules

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We report the creation of ultracold ground state $^{6}\textrm{Li}^{40}\textrm{K}$ polar molecules with high efficiency. Starting from weakly-bound molecules state, stimulated Raman adiabatic passage (STIRAP) is adopted to coherently transfer the molecules to their singlet ro-vibrational ground state $|\textrm{X}^{1}Σ^{+},v=0,J=0>$ . By employing a singlet STIRAP pathway and low-phase-noise narrow-linewidth lasers, we observed a one-way transfer efficiency of 96(4)\,\%. Held in an optical dipole trap, the lifetime of the ground-state molecules is measured to be 5.0(3)\,ms. The large permanent dipole moment of LiK is confirmed by applying a DC electric field on the molecules and performing Stark shift spectroscopy of the ground state. With recent advances in the quantum control of collisions, our work paves the way for exploring quantum many-body physics with strongly-interacting $^{6}\textrm{Li}^{40}\textrm{K}$ molecules.We report the creation of ultracold ground state $^{6}\textrm{Li}^{40}\textrm{K}$ polar molecules with high efficiency. Starting from weakly-bound molecules state, stimulated Raman adiabatic passage (STIRAP) is adopted to coherently transfer the molecules to their singlet ro-vibrational ground state $|\textrm{X}^{1}Σ^{+},v=0,J=0>$. By employing a singlet STIRAP pathway and low-phase-noise narrow-linewidth lasers, we observed a one-way transfer efficiency of 96(4)\,\%. Held in an optical dipole trap, the lifetime of the ground-state molecules is measured to be 5.0(3)\,ms. The large permanent dipole moment of LiK is confirmed by applying a DC electric field on the molecules and performing Stark shift spectroscopy of the ground state. With recent advances in the quantum control of collisions, our work paves the way for exploring quantum many-body physics with strongly-interacting $^{6}\textrm{Li}^{40}\textrm{K}$ molecules.

arXiv:2310.03300Oct 5, 20230 citations

Decelerating and Trapping Larger Polar Molecules

David Patterson

Bulletin of the American Physical SocietyJun 11, 20150 citations

This thesis reports the formation of a dual-species Bose-Einstein condensate of

^{87}

Rb and

^{133}

Cs in the same trapping potential. Quantum degenerate mixtures exhibit rich physics inaccessible to single species experiments and provide an ideal starting point for the creation of ultracold dipolar molecules. These molecules offer a wealth of new research avenues including precision metrology, quantum simulation and computation. The experimental method exploits the efficient sympathetic cooling of

^{133}

Cs via elastic collisions with

^{87}

Rb, initially in a magnetic quadrupole trap and subsequently in a levitated optical trap. Evaporative cooling in the dipole trap must compete against a high interspecies three-body inelastic collision rate \mbox{

\sim10^{-25}-10^{-26}

~cm

^{6}/

s}. The two condensates each contain up to \mbox{

2\times10^{4}

} atoms and exhibit a striking phase separation, revealing the mixture to be immiscible due to strong repulsive interspecies interactions. Sacrificing all the

^{87}

Rb during the cooling leads to the creation of single-species

^{133}

Cs condensates of up to \mbox{

6\times10^{4}

} atoms. In addition this thesis reports the observation of an interspecies Feshbach resonance at 181.7(5)~G and the creation of a pure sample of Cs

_{2}

molecules via magneto-association on the 4(g)4 resonance at 19.8~G. These results represent important steps towards the creation of ultracold polar RbCs molecules.

Efficient Creation of Ultracold Ground State

^{6}\textrm{Li}^{40}\textrm{K}

Polar Molecules

We report the creation of ultracold ground state

^{6}\textrm{Li}^{40}\textrm{K}

polar molecules with high efficiency. Starting from weakly-bound molecules state, stimulated Raman adiabatic passage (STIRAP) is adopted to coherently transfer the molecules to their singlet ro-vibrational ground state

|\textrm{X}^{1}Σ^{+},v=0,J=0>

. By employing a singlet STIRAP pathway and low-phase-noise narrow-linewidth lasers, we observed a one-way transfer efficiency of 96(4)\,\%. Held in an optical dipole trap, the lifetime of the ground-state molecules is measured to be 5.0(3)\,ms. The large permanent dipole moment of LiK is confirmed by applying a DC electric field on the molecules and performing Stark shift spectroscopy of the ground state. With recent advances in the quantum control of collisions, our work paves the way for exploring quantum many-body physics with strongly-interacting

^{6}\textrm{Li}^{40}\textrm{K}

molecules.