Enhanced Pauli blocking of light scattering in a trapped Fermi gas

Abstract

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 $E_{\mathrm{F}}>4E_{\mathrm{R}}$ in the high imbalance limit.

12 pages, 8 figures. v4: to appear in Journal of Physics B: Atomic, Molecular, and Optical Physics

References in corpus (10)

• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Quantum State Engineering and Precision Metrology using State-Insensitive Light Traps
• Direct Observation of the Superfluid Phase Transition in Ultracold Fermi Gases
• Phase diagram of a two-component Fermi gas with resonant interactions
• Degenerate Fermi Gases of Ytterbium
• Deformation of a Trapped Fermi Gas with Unequal Spin Populations
• Rapid sympathetic cooling to Fermi degeneracy on a chip
• Bragg scattering of Cooper pairs in an ultra-cold Fermi gas
• Spontaneous Emission in ultra-cold spin-polarised anisotropic Fermi Seas
• In situ Ramsey Interferometry and Diffraction Echo with an Ultracold Fermi Gas

Cited by in corpus (10)

• Suppression of Density Fluctuations in a Quantum Degenerate Fermi Gas
• Observation of Pauli blocking in light scattering from quantum degenerate fermions
• Pauli blocking of atomic spontaneous decay
• Spatial Pauli-blocking of spontaneous emission in optical lattices
• Spin-polarized fermions with $p$-wave interactions
• Pauli blocking of stimulated emission in a degenerate Fermi gas
• Observation of bosonic stimulation in light scattering
• All-optical cooling of Fermi gases via Pauli inhibition of spontaneous emission
• Disentangling Pauli blocking of atomic decay from cooperative radiation and atomic motion in a 2D Fermi gas
• Pauli blocking of light scattering in degenerate fermions