S-Wave Collisional Frequency Shift of a Fermion Clock

Abstract

We report an s-wave collisional frequency shift of an atomic clock based on fermions. In contrast to bosons, the fermion clock shift is insensitive to the population difference of the clock states, set by the first pulse area in Ramsey spectroscopy, θ_1. The fermion shift instead depends strongly on the second pulse area θ_2. It allows the shift to be canceled, nominally at θ_2 = π/2, but correlations shift the null to slightly larger θ_2. The shift applies to optical lattice clocks and increases with the spatial inhomogeneity of the clock excitation field, naturally large at optical frequencies.

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Cited by in corpus (11)

• Umklapp Superradiance from a Collisionless Quantum Degenerate Fermi Gas
• Scattering of Cold Atom Coherences by Hot Atoms: Frequency Shifts from Background Gas Collisions
• Dynamics of interacting fermions in spin-dependent potentials
• Realizing Exactly Solvable SU(N) Magnets with Thermal Atoms
• Quantum engineering of atomic phase-shifts in optical clocks
• Correlated Spin-Flip Tunneling in a Fermi Lattice Gas
• Cancellation of Collisional Frequency Shifts in Optical Lattice Clocks with Rabi Spectroscopy
• Beyond the Spin Model Approximation for Ramsey Spectroscopy
• Magic density in a self-rephasing ensemble of trapped ultracold atoms
• Decomposed description of Ramsey spectra under atomic interactions
• Scattering properties of collective dipolar systems