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Published Online March 1, 2001
Science DOI: 10.1126/science.1059318

Reports

Submitted on January 25, 2001
Accepted on February 16, 2001

Observation of Fermi Pressure in a Gas of Trapped Atoms

Andrew G. Truscott 1, Kevin E. Strecker 1, William I. McAlexander 2, Guthrie B. Partridge 1, Randall G. Hulet 1*

1 Department of Physics and Astronomy and the Rice Quantum Institute, Rice University, Houston, TX 77251, USA.
2 Department of Physics and Astronomy and the Rice Quantum Institute, Rice University, Houston, TX 77251, USA; Agilent Laboratories, MS 24M-B, Palo Alto, CA 94304-1392, USA.

* To whom correspondence should be addressed. E-mail: randy{at}atomcool.rice.edu.

We report the attainment of simultaneous quantum degeneracy in a mixed gas of bosons (7Li) and fermions (6Li). The Fermi gas has been cooled to a temperature of 0.25 times the Fermi temperature by thermal collisions with the evaporatively cooled bosons. At this temperature, the spatial size of the gas is strongly affected by the Fermi pressure resulting from the Pauli exclusion principle and gives clear experimental evidence for quantum degeneracy.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)