4.8 Article

Probing Interactions Between Ultracold Fermions

Journal

SCIENCE
Volume 324, Issue 5925, Pages 360-363

Publisher

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1169724

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Funding

  1. NIST
  2. NSF
  3. Office of Naval Research
  4. Defense Advanced Projects Research Agency
  5. National Research Council postdoctoral fellowships

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At ultracold temperatures, the Pauli exclusion principle suppresses collisions between identical fermions. This has motivated the development of atomic clocks with fermionic isotopes. However, by probing an optical clock transition with thousands of lattice-confined, ultracold fermionic strontium atoms, we observed density-dependent collisional frequency shifts. These collision effects were measured systematically and are supported by a theoretical description attributing them to inhomogeneities in the probe excitation process that render the atoms distinguishable. This work also yields insights for zeroing the clock density shift.

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