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SU(N) spin symmetry and optical atomic clocks

ORAL · Invited

Abstract

The state-of-the-art precision of a Sr optical lattice clock was used to measure SU(N) symmetrical interactions among 10 nuclear spin states in fermionic 87Sr, providing a convenient platform to observe non-equilibrium spin-orbital dynamics in SU(N) magnetism [1].  Meanwhile, by creating arrays of isolated few-body systems of 87Sr in a 3D optical lattice, high resolution clock spectroscopy revealed the onset of both elastic and inelastic multi-body interactions, highlighting the emergence of multi-body interactions in two-orbital high-spin fermions with SU(N) symmetry [2].  SU(N) symmetry also represents an untapped resource for cooling due to large s-wave collision rates and absence of spin loss, allowing us to produce deeply degenerate Fermi gases in just 0.6 s after initial laser cooling [3]. While this provides a precise study of the thermodynamics of a deeply degenerate Fermi gas with SU(N)-symmetric interactions, the fast preparation of quantum matter is also crucial for the advancement of 3D optical lattice clocks and has facilitated our recent observation of Pauli blocking of spontaneous radiative decay [4].

 

[1] X. Zhang et al., “Spectroscopic observation of SU(N)-symmetric interactions in Sr orbital magnetism,” Science 345, 1467 – 1473 (2014). 

[2] A. Goban et al., “Emergence of multi-body interactions in a fermionic lattice clock,” Nature 563, 369 – 373 (2018).

[3] L. Sonderhouse et al., “Thermodynamics of a deeply degenerate SU(N)-symmetric Fermi gas,” Nature Phys. 16, 1216 – 1221 (2020).

[4] C. Sanner et al., “Pauli blocking of atomic spontaneous decay,” arXiv:2103.02216 (2021).

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Presenters

  • Jun Ye

    JILA and University of Colorado Boulder, JILA, University of Colorado, Boulder, University of Colorado, Boulder, JILA, NIST, and University of Colorado Boulder, JILA, University of Colorado Boulder, JILA, University of Colorado and National Institute of Standards and Technology, and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA, JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA, JILA, NIST, and Department of Physics, University of Colorado, Boulder, JILA, NIST, and University of Colorado, Boulder, JILA, NIST, and University of Colorado at Boulder

Authors

  • Jun Ye

    JILA and University of Colorado Boulder, JILA, University of Colorado, Boulder, University of Colorado, Boulder, JILA, NIST, and University of Colorado Boulder, JILA, University of Colorado Boulder, JILA, University of Colorado and National Institute of Standards and Technology, and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA, JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA, JILA, NIST, and Department of Physics, University of Colorado, Boulder, JILA, NIST, and University of Colorado, Boulder, JILA, NIST, and University of Colorado at Boulder