In this thesis two experiments with heteronuclear Bose-Bose mixtures are discussed. The goal of the first experiment is a controlled doping of a rubidium condensate with single caesium atoms. These undertake the task of a non-destructive probe to investigate quantum mechanical phenomena time- and spatially resolved. In this thesis the necessary methods to produce, store, and detect both components, single atoms and the condensate, are realized. In a first experiment up to 10 caesium atoms are stored as a probe in contact with a cold rubidium atomic cloud. The interaction parameters are extracted from the dynamics of the single atoms. This is an important step towards the controlled doping of a condensate. The aim of the second experiment is the production and spectroscopy of ultracold heteronuclear potassium-rubidium molecules with universal properties. Close to two magnetic s-wave Feshbach resonances weakly bound molecules in high vibrational states are created, and their binding energy and the position of the associated Feshbach resonance are determined. These results in combination with two narrow d-wave Feshbach resonances provide the basis for a more precise parametrization of the potassium-rubidium molecular potential. The knowledge of this is important to identify a proper scheme to transfer the molecules via coherent coupling into their rovibrational ground state. These molecules offer a permanent dipole moment and thus are of particular interest for e.g. quantum information processing due to their anisotropic, long-range dipole-dipole interaction.In this thesis two experiments with heteronuclear Bose-Bose mixtures are discussed. The goal of the first experiment is a controlled doping of a rubidium condensate with single caesium atoms. These undertake the task of a non-destructive probe to investigate quantum mechanical phenomena time- and spatially resolved. In this thesis the necessary methods to produce, store, and detect both components, single atoms and the condensate, are realized. In a first experiment up to 10 caesium atoms are stored as a probe in contact with a cold rubidium atomic cloud. The interaction parameters are extracted from the dynamics of the single atoms. This is an important step towards the controlled doping of a condensate. The aim of the second experiment is the production and spectroscopy of ultracold heteronuclear potassium-rubidium molecules with universal properties. Close to two magnetic s-wave Feshbach resonances weakly bound molecules in high vibrational states are created, and their binding energy and the position of the associated Feshbach resonance are determined. These results in combination with two narrow d-wave Feshbach resonances provide the basis for a more precise parametrization of the potassium-rubidium molecular potential. The knowledge of this is important to identify a proper scheme to transfer the molecules via coherent coupling into their rovibrational ground state. These molecules offer a permanent dipole moment and thus are of particular interest for e.g. quantum information processing due to their anisotropic, long-range dipole-dipole interaction.

Apr 14, 20101 citation

Observation of ultracold ground-state heteronuclear molecules

Gustavo Deczka Telles, M. Mancini, Anderson R. L. Caires +2 more

Verhandlungen der Deutschen Physikalischen GesellschaftJan 1, 20040 citations

Production of ultracold Cs*Yb molecules by photoassociation

Alexander Guttridge, S. A. Hopkins, Matthew D. Frye +3 more

We report the production of ultracold heteronuclear ${\mathrm{Cs}}^{*}\mathrm{Yb}$ molecules through one-photon photoassociation applied to an ultracold atomic mixture of Cs and Yb confined in an optical dipole trap. We use trap-loss spectroscopy to detect molecular states below the $\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}(^{2}P_{1/2})+\mathrm{Yb}(^{1}S_{0})$ asymptote. For $^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{174}\mathrm{Yb}$ , we observe 13 rovibrational states with binding energies up to $\ensuremath{\sim}500\phantom{\rule{0.28em}{0ex}}\mathrm{GHz}$. For each rovibrational state we observe two resonances associated with the Cs hyperfine structure and show that the hyperfine splitting in the diatomic molecule decreases for more deeply bound states. In addition, we produce ultracold fermionic $^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{173}\mathrm{Yb}$ and bosonic $^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{172}\mathrm{Yb}$ and $^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{170}\mathrm{Yb}$ molecules. From mass scaling, we determine the number of vibrational levels supported by the 2(1/2) excited-state potential to be 154 or 155.We report the production of ultracold heteronuclear ${\mathrm{Cs}}^{*}\mathrm{Yb}$ molecules through one-photon photoassociation applied to an ultracold atomic mixture of Cs and Yb confined in an optical dipole trap. We use trap-loss spectroscopy to detect molecular states below the $\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}(^{2}P_{1/2})+\mathrm{Yb}(^{1}S_{0})$ asymptote. For $^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{174}\mathrm{Yb}$, we observe 13 rovibrational states with binding energies up to $\ensuremath{\sim}500\phantom{\rule{0.28em}{0ex}}\mathrm{GHz}$. For each rovibrational state we observe two resonances associated with the Cs hyperfine structure and show that the hyperfine splitting in the diatomic molecule decreases for more deeply bound states. In addition, we produce ultracold fermionic $^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{173}\mathrm{Yb}$ and bosonic $^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{172}\mathrm{Yb}$ and $^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{170}\mathrm{Yb}$ molecules. From mass scaling, we determine the number of vibrational levels supported by the 2(1/2) excited-state potential to be 154 or 155.

arXiv:1804.07319Physical Review AJun 19, 201831 citations

Theory of ultracold heteronuclear polar molecules

John L. Bohn

Bulletin of the American Physical SocietyMar 22, 20110 citations

Strongly interacting ultracold polar molecules

Bryce Gadway, Bo Yan

Abstract This paper reviews recent advances in the study of strongly interacting systems of dipolar molecules. Heteronuclear molecules feature large and tunable electric dipole moments, which give rise to long-range and anisotropic dipole–dipole interactions. Ultracold samples of dipolar molecules with long-range interactions offer a unique platform for quantum simulations and the study of correlated many-body physics. We provide an introduction to the physics of dipolar quantum gases, both electric and magnetic, and summarize the multipronged efforts to bring dipolar molecules into the quantum regime. We discuss in detail the recent experimental progress in realizing and studying strongly interacting systems of polar molecules trapped in optical lattices, with particular emphasis on the study of interacting spin systems and non-equilibrium quantum magnetism. Finally, we conclude with a brief discussion of the future prospects for studies of strongly interacting dipolar molecules.Abstract This paper reviews recent advances in the study of strongly interacting systems of dipolar molecules. Heteronuclear molecules feature large and tunable electric dipole moments, which give rise to long-range and anisotropic dipole–dipole interactions. Ultracold samples of dipolar molecules with long-range interactions offer a unique platform for quantum simulations and the study of correlated many-body physics. We provide an introduction to the physics of dipolar quantum gases, both electric and magnetic, and summarize the multipronged efforts to bring dipolar molecules into the quantum regime. We discuss in detail the recent experimental progress in realizing and studying strongly interacting systems of polar molecules trapped in optical lattices, with particular emphasis on the study of interacting spin systems and non-equilibrium quantum magnetism. Finally, we conclude with a brief discussion of the future prospects for studies of strongly interacting dipolar molecules.

arXiv:1607.03528Journal of Physics B Atomic Molecular and Optical PhysicsJun 30, 2016100 citations

Ultracold dense gas of heteronuclear deeply bound molecules

Silke Ospelkaus

Bulletin of the American Physical SocietyMay 29, 20080 citations

We report the production of ultracold heteronuclear

{\mathrm{Cs}}^{*}\mathrm{Yb}

molecules through one-photon photoassociation applied to an ultracold atomic mixture of Cs and Yb confined in an optical dipole trap. We use trap-loss spectroscopy to detect molecular states below the

\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}(^{2}P_{1/2})+\mathrm{Yb}(^{1}S_{0})

asymptote. For

^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{174}\mathrm{Yb}

, we observe 13 rovibrational states with binding energies up to $\ensuremath{\sim}500\phantom{\rule{0.28em}{0ex}}\mathrm{GHz}$. For each rovibrational state we observe two resonances associated with the Cs hyperfine structure and show that the hyperfine splitting in the diatomic molecule decreases for more deeply bound states. In addition, we produce ultracold fermionic

^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{173}\mathrm{Yb}

and bosonic

^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{172}\mathrm{Yb}

and

^{133}\mathrm{Cs}\phantom{\rule{0.16em}{0ex}}^{170}\mathrm{Yb}

molecules. From mass scaling, we determine the number of vibrational levels supported by the 2(1/2) excited-state potential to be 154 or 155.