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Engineering many-body interactions in a spin-orbit-coupled Wannier-Stark optical lattice clock

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Abstract

We present recent experimental work towards understanding and harnessing atomic interactions within a strontium optical lattice clock [1]. Our vertically oriented, shallow, 1D optical lattice realizes partially delocalized Wannier-Stark eigenstates with superior quantum coherence [2]. On a single site, fermionic Sr atoms interact via weak p-wave interactions. Due to incommensurate lattice and clock wavelengths, spin-orbit coupling allows atoms in neighboring sites to interact via the s-wave channel. Balancing these collisional shifts, we can operate our optical lattice clock with a far higher on-site density while realizing a negligible density shift. Interactions are enhanced by addressing a site-changing Wannier-Stark transition. With the s-wave channel effectively opened to on-site interactions, the collisional shift is far greater in magnitude. We utilize this technique along with in situ imaging to observe a dynamical phase transition between dynamical ferromagnetic and paramagnetic states.

[1] A Aeppli, A Chu, et al. "Hamiltonian engineering of spin-orbit coupled fermions in a Wannier-Stark optical lattice clock." arXiv preprint arXiv:2201.05909 (2022).

[2] Bothwell, Tobias, et al. "Resolving the gravitational redshift within a millimeter atomic sample." arXiv preprint arXiv:2109.12238 (2021); Nature, in press (2022).

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Publication: [1] A Aeppli, A Chu, et al. "Hamiltonian engineering of spin-orbit coupled fermions in a Wannier-Stark optical lattice clock." arXiv preprint arXiv:2201.05909 (2022).<br>[2] Bothwell, Tobias, et al. "Resolving the gravitational redshift within a millimeter atomic sample." arXiv preprint arXiv:2109.12238 (2021); Nature, in press (2022).

Presenters

  • Alexander G Aeppli

    University of Colorado, Boulder

Authors

  • Alexander G Aeppli

    University of Colorado, Boulder

  • Anjun Chu

    JILA, JILA, NIST and Dept. of Physics, University of Colorado Boulder

  • Tobias Bothwell

    University of Colorado, Boulder, JILA, NIST and Dept. of Physics, University of Colorado Boulder, JILA, NIST, and University of Colorado Boulder, JILA, NIST and University of Colorado Boulder

  • Colin J Kennedy

    Quantinuum, JILA, NIST and Dept. of Physics, University of Colorado Boulder, JILA, NIST, and University of Colorado Boulder, University of Colorado, Boulder, JILA, NIST and University of Colorado Boulder

  • Dhruv Kedar

    JILA, NIST, and University of Colorado, 440 UCB, Boulder, Colorado 80309, USA, University of Colorado, Boulder, JILA, NIST and Dept. of Physics, University of Colorado Boulder

  • Peiru He

    JILA, JILA, NIST and Dept. of Physics, University of Colorado Boulder

  • Kyungtae Kim

    JILA, University of Colorado, Boulder

  • Ana Maria Rey

    JILA, JILA, NIST and Dept. of Physics, University of Colorado Boulder, UC Boulder/JILA, JILA, NIST and University of Colorado Boulder, JILA, Department of Physics, University of Colorado, Boulder

  • Jun Ye

    University of Colorado, Boulder, JILA, NIST, and University of Colorado, 440 UCB, Boulder, Colorado 80309, USA, JILA, NIST and Dept. of Physics, University of Colorado Boulder, CU Boulder