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Originally published in Science Express on 1 March 2001
Science 30 March 2001:
Vol. 291. no. 5513, pp. 2570 - 2572
DOI: 10.1126/science.1059318
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Reports

Observation of Fermi Pressure in a Gas of Trapped Atoms

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

We report the attainment of simultaneous quantum degeneracy in a mixed gas of bosons (lithium-7) and fermions (lithium-6). 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.

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

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

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