Excitation Spectrum and Superfluid Gap of an Ultracold Fermi Gas

Explore the groundbreaking research on ultracold Fermi gases in this 45-minute APS Physics conference talk. Delve into the findings of Hauke Biss and colleagues from Universität Hamburg, Germany, as they discuss their Physical Review Letters paper on the excitation spectrum and superfluid gap of ultracold Fermi gases. Learn about their innovative use of Bragg spectroscopy to measure the full momentum-resolved low-energy excitation spectrum of strongly interacting ultracold Fermi gases. Discover how this technique allowed direct observation of the smooth transformation from bosonic to fermionic superfluid in the BEC-BCS crossover. Examine the evolution of the superfluid gap and its comparison with previous experiments and theoretical calculations. Gain insights into the better agreement shown by calculations including particle-hole correlations in the BCS regime. Participate in a live Q&A session moderated by Zoran Hadzibabic from the University of Cambridge, where the researchers address audience questions and further elaborate on their groundbreaking work in quantum physics.