Pump-probe spectroscopy on impurities in a potassium BEC reveals low-energy spectral features below the Bose polaron that are consistent with bipolaron formation.
Naidon, Two impurities in a Bose–Einstein conden- sate: From yukawa to efimov attracted polarons, Journal of the Physical Society of Japan87, 043002 (2018)
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Observation of low-lying impurity states in Bose-Einstein condensates
Pump-probe spectroscopy on impurities in a potassium BEC reveals low-energy spectral features below the Bose polaron that are consistent with bipolaron formation.