Analyzing a Bose polaron across resonant interactions

Year: 2019

Authors: Ardila LAP., Jorgensen NB., Pohl T., Giorgini S., Bruun GM., Arlt JJ.

Autors Affiliation: Aarhus Univ, Inst Fys & Astron, DK-8000 Aarhus C, Denmark; Max Planck Inst Phys Komplexer Syst, Nothnitzer Str 38, D-01187 Dresden, Germany; Univ Trento, Dipartimento Fis, I-38123 Povo, Trento, Italy; CNR INO BEC Ctr, I-38123 Povo, Trento, Italy.

Abstract: Recently, two independent experiments reported the observation of long-lived polarons in a Bose-Einstein condensate, providing an excellent setting to study the generic scenario of a mobile impurity interacting with a quantum reservoir. Here we expand the experimental analysis by disentangling the effects of trap inhomogeneities and the many-body continuum in one of these experiments. This makes it possible to extract the energy of the polaron at a well-defined density as a function of the interaction strength. Comparisons with quantum Monte Carlo as well as diagrammatic calculations show good agreement, and provide a more detailed picture of the polaron properties at stronger interactions than previously possible. Moreover, we develop a semiclassical theory for the motional dynamics and three-body loss of the polarons, which partly explains a previously unresolved discrepancy between theory and experimental observations for repulsive interactions. Finally, we utilize quantum Monte Carlo calculations to demonstrate that the findings reported in the two experiments are consistent with each other.

Journal/Review: PHYSICAL REVIEW A

Volume: 99 (6)      Pages from: 063607  to: 063607

More Information: We gratefully thank Arturo Camacho-Guardian for providing the diagrammatic calculations. This work has been supported by the Villum Foundation, the Carlsberg foundation, the Danish council for Independent Research. In addition, T.P. acknowledges the Danish National Research Foundation through a Niels Bohr Professorship. S.G. acknowledges support from the EU Horizon 2020 research and innovation programme under Grant Agreement No. 641122 QUIC, and from the Provincia Autonoma di Trento.
KeyWords: IMPURITIES
DOI: 10.1103/PhysRevA.99.063607

ImpactFactor: 2.777
Citations: 77
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