Probing interactions between ultracold fermions

Published

April 17, 2009

Author(s)

G K. Campbell, M M. Boyd, J W. Thomsen, M J. Martin, S Blatt, M D. Swallows, Travis L. Nicholson, Tara Fortier, Christopher W. Oates, Scott Diddams, Nathan D. Lemke, Pascal Naidon, Paul S. Julienne, Jun Ye, Andrew Ludlow

Abstract

At ultracold temperatures, the Pauli exclusion principle suppresses collisions between identical fermions. This has motivated the development of atomic clocks using fermionic isotopes. However, by probing an optical clock transition with thousands of lattice-confined, ultracold fermionic Sr atoms, we have observed density-dependent collisional frequency shifts. These collision effects have been measured systematically and are supported by a theoretical description providing a fundamental understanding of fermionic interactions including the effect of the measurement process. This work has also yielded insights for zeroing the clock density shift.

Citation

Science

Volume

324

Pub Type

Journals

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Keywords

fermions, optical lattice, strontium, ultracold collisions, atomic clock

Citation

Campbell, G. , Boyd, M. , Thomsen, J. , Martin, M. , Blatt, S. , Swallows, M. , Nicholson, T. , Fortier, T. , Oates, C. , Diddams, S. , Lemke, N. , Naidon, P. , Julienne, P. , Ye, J. and Ludlow, A. (2009), Probing interactions between ultracold fermions, Science, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=901519 (Accessed April 25, 2024)