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arXiv · 2405.01401

Breaking and trapping Cooper pairs by Rydberg-molecule spectroscopy in atomic Fermi superfluids

Chih-Chun Chien·Simeon I. Mistakidis·Hossein R. Sadeghpour
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Abstract

We propose a spectroscopic probe of the breaking and localization of Cooper pairs in an atomic Fermi superfluid interacting with a Rydberg impurity. This is achieved by monitoring the formation of diatomic and triatomic ultralong-range molecular species in the superfluid across the BCS - Bose Einstein condensation (BEC) crossover. The triatomic Rydberg molecule in the BEC regime heralds the trapping of a tightly-bound Cooper pair, reminiscent of pion capture in nuclear matter, while the breaking of a Cooper pair on the BCS side by a diatomic Rydberg molecule is evocative of binary-star tidal disruption by a black hole. Spectroscopy of the Fermi superfluid and Rydberg molecules allows for an estimation of the Cooper-pair size while the Rydberg molecule binding energies discern many-body pairing effects.

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Chih-Chun Chien, Simeon I. Mistakidis, Hossein R. Sadeghpour. 2024-05-02. Breaking and trapping Cooper pairs by Rydberg-molecule spectroscopy in atomic Fermi superfluids. https://doi.org/10.1103/physreva.110.l051303

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