Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-04-10
J. Phys. B: At. Mol. Opt. Phys. 43, 015301 (2010)
Physics
Condensed Matter
Quantum Gases
12 pages, 8 figures. v4: to appear in Journal of Physics B: Atomic, Molecular, and Optical Physics
Scientific paper
10.1088/0953-4075/43/1/015301
Pauli blocking of spontaneous emission by a single excited-state atom has been predicted to be dramatic at low temperature when the Fermi energy $E_\mathrm{F}$ exceeds the recoil energy $E_\mathrm{R}$. The photon scattering rate of a ground-state Fermi gas can also be suppressed by occupation of the final states accessible to a recoiling atom, however suppression is diminished by scattering events near the Fermi edge. We analyze two new approaches to improve the visibility of Pauli blocking in a trapped Fermi gas. Focusing the incident light to excite preferentially the high-density region of the cloud can increase the blocking signature by 14%, and is most effective at intermediate temperature. Spontaneous Raman scattering between imbalanced internal states can be strongly suppressed at low temperature, and is completely blocked for a final-state $E_\mathrm{F} > 4 E_\mathrm{R}$ in the high imbalance limit.
Shuve Brian
Thywissen Joseph H.
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