Spectroscopy of Superfluid Pairing in Atomic Fermi Gases
H.P. B\"uchler, P. Zoller, W. Zwerger
TL;DR
This paper investigates the dynamic structure factors of density and spin in atomic Fermi gases across the BCS-BEC crossover, providing insights into superfluid pairing mechanisms through spectroscopic measurements.
Contribution
It introduces a method to distinguish pairing mechanisms in Fermi gases by analyzing density and spin structure factors via Bragg spectroscopy.
Findings
Spin structure factor reveals the two-particle gap.
Density structure shows collective sound mode.
Both structure factors are experimentally accessible.
Abstract
We study the dynamic structure factor for density and spin within the crossover from BCS superfluidity of atomic fermions to the Bose-Einstein condensation of molecules. Both structure factors are experimentally accessible via Bragg spectroscopy, and allow for the identification of the pairing mechanism: the spin structure factor allows for the determination of the two particle gap, while the collective sound mode in the density structure reveals the superfluid state.
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