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Spin Bragg spectroscopy
August 2012
Ultracold Fermi gases near a Feshbach resonance provide a well-controlled setting to explore the
intricacies of superfluidity. Researchers at Swinburne's Centre for Atom Optics and Ultrafast
Spectroscopy have developed the new technique of Spin Bragg Spectroscopy to probe the dynamic
spin susceptibility which has not previously been studied in these systems.
In a paper published in Physical Review Letters the Swinburne team report the measurement of the
dynamic spin response of a gas of 6Li atoms in the superfluid phase. These measurements revealed
the role played by pair-correlations between different combinations of spin states in determining
the excitation spectrum, as well as seeing evidence for universal scaling behaviour at high
energies.
Reference: Phys. Rev. Lett. 109, 050403 (2012)
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