Impurity in a heteronuclear two-component Bose mixture

Year: 2022

Authors: Bighin G., Burchianti A., Minardi F., Macri T.

Autors Affiliation: IST Austria Inst Sci & Technol Austria, Campus 1, A-3400 Klosterneuburg, Austria; Heidelberg Univ, Inst Theoret Phys, Philosophenweg 19, D-69120 Heidelberg, Germany; CNR INO, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy; Univ Firenze, LENS, I-50019 Sesto Fiorentino, Italy; Univ Firenze, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, Italy; Univ Bologna, Dipartimento Fis & Astron, I-40127 Bologna, Italy; Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, Campus Univ, BR-59078970 Natal, RN, Brazil; Univ Fed Rio Grande do Norte, Int Inst Phys, Campus Univ, BR-59078970 Natal, RN, Brazil.

Abstract: We study the fate of an impurity in an ultracold heteronuclear Bose mixture, focusing on the experimentally relevant case of a K41-Rb87 mixture, with the impurity in a K41 hyperfine state. Our paper provides a comprehensive description of an impurity in a BEC mixture with contact interactions across its phase diagram. We present results for the miscible and immiscible regimes, as well as for the impurity in a self-bound quantum droplet. Here, varying the interactions, we find exotic states where the impurity localizes either at the center or at the surface of the droplet.

Journal/Review: PHYSICAL REVIEW A

Volume: 106 (2)      Pages from: 023301-1  to: 023301-10

More Information: We thank A. Simoni for providing the calculations of the intercomponent scattering lengths. We gratefully acknowl-edge stimulating discussions with L. A. Pena Ardila, R. Schmidt, H. Silva, V. Zampronio, and M. Prevedelli for careful reading. G.B. acknowledges support from the Austrian Science Fund (FWF) under Project No. M2641-N27. T.M. acknowledges CNPq for support through Bolsa de produtividade em Pesquisa No. 311079/2015-6. This work is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany´s Excellence Strategy No. EXC2181/1-390900948 (the Heidelberg STRUCTURES Excellence Cluster). This work was supported by the Serrapilheira Institute (Grant No. Serra-1812-27802). We thank the High-Performance Computing Center (NPAD) at UFRN for providing computational resources.
KeyWords: cold atoms; Bose-Einstein condensates
DOI: 10.1103/PhysRevA.106.023301

Citations: 10
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