Dynamic spin response of a strongly interacting Fermi gas

Abstract

We present an experimental investigation of the dynamic spin response of a strongly interacting Fermi gas using Bragg spectroscopy. By varying the detuning of the Bragg lasers, we show that it is possible to measure the response in the spin and density channels separately. At low Bragg energies, the spin response is suppressed due to pairing, whereas the density response is enhanced. These experiments provide the first independent measurements of the spin-parallel and spin-antiparallel dynamic and static structure factors and open the way to a complete study of the structure factors at any momentum. At high momentum the spin-antiparallel dynamic structure factor displays a universal high frequency tail, proportional to ${\omega }^{-5/2}$, where $\hslash \omega$ is the probe energy.

Replaced with final version

References in corpus (11)

• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Generalized Virial Theorem and Pressure Relation for a strongly correlated Fermi gas
• Exact Relations for a Strongly-interacting Fermi Gas from the Operator Product Expansion
• Verification of universal relations in a strongly interacting Fermi gas
• Bragg spectroscopy of a strongly interacting Fermi gas
• Universal Properties of the Ultra-Cold Fermi Gas
• Viscosity and scale invariance in the unitary Fermi gas
• Static structure factor of a strongly correlated Fermi gas at large momenta
• Bragg Spectroscopy of Cold Atomic Fermi Gases
• Molecular Bose-Einstein condensation in a versatile low power crossed dipole trap

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• Dispersion relation and excitation character of a two-component Bose-Einstein condensate
• Visualizing the BEC-BCS crossover in the two-dimensional Fermi gas: pairing gaps and dynamical response functions from ab initio computations
• Predicting Energies of Small Clusters from the Inhomogeneous Unitary Fermi Gas
• Deep inelastic scattering on ultracold gases
• Static response, collective frequencies and ground state thermodynamical properties of spin saturated two-component cold atoms and neutron matter
• Spin transport in a unitary Fermi gas close to the BCS transition
• Neutrino scattering in supernovae and spin correlations of a unitary gas