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

More Information: We acknowledge insightful discussions with Tilman Enss, Tin-Lun Ho, Randall Hulet, Pietro Massignan, Dmitry Petrov, Alessio Recati, Tommaso Roscilde, Christian Sanner and Joseph Thywissen. Special thanks to the LENS Quantum Gases group. This work was supported under European Research Council Grants No. 307032 QuFerm2D, and No. 637738 PoLiChroM, Fondazione Cassa di Risparmio di Firenze Project No. 2016.0770 QuSim2D, and the Marie Sklodowska-Curie program (fellowship to F. S.).
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

ImpactFactor: 9.227
Citations: 37
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