Time-Resolved Observation of Competing Attractive and Repulsive Short-Range Correlations in Strongly Interacting Fermi Gases

Year: 2018

Authors: Amico A.; Scazza F.; Valtolina G.; Tavares P. E. S.; Ketterle W.; Inguscio M.; Roati G.; Zaccanti M.

Autors Affiliation: Univ Firenze, LENS, I-50019 Sesto Fiorentino, Italy; Univ Firenze, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, Italy; CNR, INO, I-50019 Sesto Fiorentino, Italy; MIT, MIT Harvard Ctr Ultracold Atoms, Dept Phys, Cambridge, MA 02139 USA; MIT, Res Lab Elect, Cambridge, MA 02139 USA; Univ Colorado, JILA, Boulder, CO 80309 USA; Univ Sao Paulo, Inst Fis Sao Carlos, Caixa Postal 369, BR-13560970 Sao Carlos, SP, Brazil

Abstract: 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

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 121 (25)      Pages from: 253602-1  to: 253602-6

KeyWords: Electron gas; Petroleum prospecting, Competing mechanisms; Dynamical regime; Feshbach resonances; Out-of-equilibrium dynamics; Short-range correlations; Spectroscopic technique; Time resolved pump probes; Two-component fermi gas, Fermions; Spectroscopy; Ferromagnetism
DOI: 10.1103/PhysRevLett.121.253602

Citations: 32
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