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Researchers have used single-atom resolution imaging to reveal that pair correlations in finite fermionic systems unexpectedly shift from the high-density bulk to the low-density surface under specific closed-shell configurations. This finding challenges standard expectations regarding the BCS-BEC crossover and provides a microscopic view of pairing mechanisms relevant to superconductivity and nuclear structure. The study highlights how confinement and particle number fundamentally alter quantum correlation profiles in few-atom systems.

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Researchers Find Pair Correlations Shift From Surface to Bulk in Few-Atom Systems

Quantum ZeitgeistAugust 5, 20263 min read

Using single-atom resolution, researchers at arXivLabs observed how pair correlations shift from the surface to the bulk in systems of just a few fermionic atoms.

Researchers led by Sandra Brandstetter of teh Physikalisches Institut der Universit¨at Heidelberg and colleague form Technische Universit¨at Darmstadt, Lund University and Aarhus University, have imaged pair correlations in a finite, tunable system of few fermionic atoms, revealing a surprising shift in pairing behavior. The team used single-particle resolution imaging to observe pair correlations, a level of detail previously inaccessible.…

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