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Probing ultracold ytterbium in optical lattices with resonant light: from coherent control to dissipative dynamics

Abstract : In this manuscript I present an experimental investigation of the dynamics of an ultracold gas of bosonic ytterbium loaded into optical lattices and exposed to resonant light. The interaction between atoms and light makes it possible to study the coherence properties of the gas. The resonant driving is performed on the relevant optical transitions featured by alkaline-earth-like atoms such as ytterbium. Specifically, I use the clock transition, which has no spontaneous emission, to coherently manipulate the internal degrees of freedom of the atoms. I also use the so-called intercombination transition, the spontaneous emission rate of which is tunable, to produce a controllable dissipation. On the one hand, I demonstrate the coherent driving of the internal state of the atoms on the clock transition, the excited state of which is metastable and cannot spontaneously decay, thus preserving the coherence of the gas. The temporal internal dynamics in a deep lattice allows me to measure the collisional properties at low temperature for both clock states. On the other hand, I use the spontaneously emitted photons of the intercombination transition excited level to induce a coupling to the external degrees of freedom of the atoms. I present the momentum diffusion of a superfluid excited on this transition. Strong interactions between atoms slow down the decoherence and lead to an anomalous sub-diffusive relaxation. A simple model comprising atomic motion, interactions and dissipation accounts for our observations. A theoretical study of the dissipative dynamics in optical lattices sheds light on complementary phenomena such as induced dipole-dipole interactions or collective effects in spontaneous emission.
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Contributor : Raphaël Bouganne Connect in order to contact the contributor
Submitted on : Tuesday, October 9, 2018 - 9:10:19 AM
Last modification on : Thursday, March 17, 2022 - 10:09:00 AM
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  • HAL Id : tel-02612228, version 1


Raphaël Bouganne. Probing ultracold ytterbium in optical lattices with resonant light: from coherent control to dissipative dynamics. Physics [physics]. Sorbonne Université, Université Pierre et Marie Curie, Paris 6, 2018. English. ⟨tel-02612228v1⟩



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