We study the collapse and revival of coherence induced by dipolar spin waves in a trapped gas of $^{87}\mathrm{Rb}$ atoms. In particular, we observe spatially localized collapse and revival of Ramsey fringe contrast and show how the pattern of coherence depends on the strength of the spin-wave excitation. We find that the spatial character of the coherence dynamics is incompatible with a simple model based only on position-space overlap of wave functions. We show that this phenomenon requires a full phase-space description of the atomic spin using a quantum Boltzmann transport equation, which highlights spin-wave-induced coherent spin currents and the ensuing dynamics they drive.We study the collapse and revival of coherence induced by dipolar spin waves in a trapped gas of $^{87}\mathrm{Rb}$ atoms. In particular, we observe spatially localized collapse and revival of Ramsey fringe contrast and show how the pattern of coherence depends on the strength of the spin-wave excitation. We find that the spatial character of the coherence dynamics is incompatible with a simple model based only on position-space overlap of wave functions. We show that this phenomenon requires a full phase-space description of the atomic spin using a quantum Boltzmann transport equation, which highlights spin-wave-induced coherent spin currents and the ensuing dynamics they drive.

arXiv:1008.4428Physical Review AJan 28, 20114 citations

Spin Susceptibility and Strong Coupling Effects in an Ultracold Fermi Gas

Hiroyuki Tajima, Ryo Hanai, Ryota Watanabe +1 more

arXiv:1307.1301Journal of Low Temperature PhysicsSep 30, 20130 citations

Density and spin response functions in ultracold fermionic gases

Bogdan Mihaila, S. Gaudio, Krastan B. Blagoev +3 more

Bulletin of the American Physical SocietyMar 22, 20050 citations

Homogeneous Atomic Fermi Gases

Biswaroop Mukherjee, Zhenjie Yan, Parth Patel +4 more

We report on the creation of homogeneous Fermi gases of ultracold atoms in a uniform potential. In the momentum distribution of a spin-polarized gas, we observe the emergence of the Fermi surface and the saturated occupation of one particle per momentum state: the striking consequence of Pauli blocking in momentum space for a degenerate gas. Cooling a spin-balanced Fermi gas at unitarity, we create homogeneous superfluids and observe spatially uniform pair condensates. For thermodynamic measurements, we introduce a hybrid potential that is harmonic in one dimension and uniform in the other two. The spatially resolved compressibility reveals the superfluid transition in a spin-balanced Fermi gas, saturation in a fully polarized Fermi gas, and strong attraction in the polaronic regime of a partially polarized Fermi gas.We report on the creation of homogeneous Fermi gases of ultracold atoms in a uniform potential. In the momentum distribution of a spin-polarized gas, we observe the emergence of the Fermi surface and the saturated occupation of one particle per momentum state: the striking consequence of Pauli blocking in momentum space for a degenerate gas. Cooling a spin-balanced Fermi gas at unitarity, we create homogeneous superfluids and observe spatially uniform pair condensates. For thermodynamic measurements, we introduce a hybrid potential that is harmonic in one dimension and uniform in the other two. The spatially resolved compressibility reveals the superfluid transition in a spin-balanced Fermi gas, saturation in a fully polarized Fermi gas, and strong attraction in the polaronic regime of a partially polarized Fermi gas.

arXiv:1610.10100Physical Review LettersMar 23, 2017254 citations

Fluctuations and correlations in ultracold Fermi gases

Jan Jakob Meineke

Jan 1, 20121 citation

We study the collapse and revival of coherence induced by dipolar spin waves in a trapped gas of

^{87}\mathrm{Rb}

atoms. In particular, we observe spatially localized collapse and revival of Ramsey fringe contrast and show how the pattern of coherence depends on the strength of the spin-wave excitation. We find that the spatial character of the coherence dynamics is incompatible with a simple model based only on position-space overlap of wave functions. We show that this phenomenon requires a full phase-space description of the atomic spin using a quantum Boltzmann transport equation, which highlights spin-wave-induced coherent spin currents and the ensuing dynamics they drive.