Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-01-29
Physics
Condensed Matter
Statistical Mechanics
11 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.86.5409
We have produced an interacting quantum degenerate Fermi gas of atoms composed of two spin-states of magnetically trapped $^{40}$K. The relative Fermi energies are adjusted by controlling the population in each spin-state. Measurements of the thermodynamics reveal the resulting imbalance in the mean energy per particle between the two species, which is as large as a factor of 1.4 at our lowest temperature. This imbalance of energy comes from a suppression of collisions between atoms in the gas due to the Pauli exclusion principle. Through measurements of the thermal relaxation rate we have directly observed this Pauli blocking as a factor of two reduction in the effective collision cross-section in the quantum degenerate regime.
DeMarco Bobby
Jin Deborah S.
Papp Scott B.
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