Time-Resolved Observation of Competing Attractive and Repulsive Short-Range Correlations in Strongly Interacting Fermi Gases
Author(s)
Amico, A.; Scazza, F.; Valtolina, G.; Tavares, P. E. S.; Inguscio, M.; Roati, G.; Zaccanti, M.; Ketterle, Wolfgang; ... Show more Show less
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Time-Resolved Observation of Competing Attractive and Repulsive Short-Range Correlations in Strongly Interacting Fermi Gases
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© 2018 American Physical Society. We exploit a time-resolved pump-probe spectroscopic technique to study the out-of-equilibrium dynamics of an ultracold two-component Fermi gas, selectively quenched to strong repulsion along the upper branch of a broad Feshbach resonance. For critical interactions, we find the rapid growth of short-range anticorrelations between repulsive fermions to initially overcome concurrent pairing processes. At longer evolution times, these two competing mechanisms appear to macroscopically coexist in a short-range correlated state of fermions and pairs, unforeseen thus far. Our work provides fundamental insights into the fate of a repulsive Fermi gas, and offers new perspectives towards the exploration of complex dynamical regimes of fermionic matter.
Date issued
2018-12-19Department
Massachusetts Institute of Technology. Department of Physics; MIT-Harvard Center for Ultracold Atoms; Massachusetts Institute of Technology. Research Laboratory of ElectronicsJournal
Physical Review Letters
Publisher
American Physical Society (APS)
ISSN
0031-9007
1079-7114