Time-Resolved Observation of Competing Attractive and Repulsive Short-Range Correlations in Strongly Interacting Fermi Gases
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; FerromagnetismDOI: 10.1103/PhysRevLett.121.253602Citations: 12data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-08-02References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here