Abstract
We study transverse spin dynamics on a microscopic level by measuring energy-resolved spin correlations in weakly interacting Fermi gases (WIFGs). The trapped cloud behaves as a many-body spin lattice in energy space with effective long-range interactions, simulating a collective Heisenberg model. We observe the flow of correlations in energy space in this quasi-continuous system, revealing the connection between the evolution of the magnetization and the localization or spread of correlations. This work highlights energy-space correlation as an observable in quantum phase transition studies of WIFGs, decoding system features that are hidden in macroscopic measurements.
- Received 13 September 2023
- Revised 1 December 2023
- Accepted 28 March 2024
DOI:https://doi.org/10.1103/PhysRevA.109.L041301
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