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Time-Resolved Observation of Competing Attractive and Repulsive Short-Range Correlations in Strongly Interacting
A Amico1,2, F Scazza1,2, G Valtolina1,2
1LENS and Dipartimento di Fisica e Astronomia, Università di Firenze, 50019 Sesto Fiorentino, Italy.
Physical Review Letters
|January 5, 2019
Summary
We studied ultracold repulsive Fermi gases and found that short-range correlations initially dominate over pairing. These competing mechanisms then coexist in a novel correlated state of fermions and pairs.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Condensed Matter Physics
- Quantum Gases
Background:
- Ultracold Fermi gases provide a tunable platform to study quantum many-body phenomena.
- Understanding out-of-equilibrium dynamics is crucial for exploring novel quantum states.
Purpose of the Study:
- Investigate the dynamics of a two-component Fermi gas quenched to strong repulsion.
- Characterize the interplay between fermionic correlations and pairing.
Main Methods:
- Utilized time-resolved pump-probe spectroscopy.
- Studied ultracold two-component Fermi gas near a Feshbach resonance.
Main Results:
- Observed rapid growth of short-range anticorrelations between fermions.
- Found these correlations initially overcome pairing processes.
- Identified macroscopic coexistence of fermions and pairs in a correlated state at longer times.
Conclusions:
- Revealed a novel dynamical regime in repulsive Fermi gases.
- Demonstrated the complex interplay of competing many-body mechanisms.
- Opened new avenues for exploring fermionic matter dynamics.
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