{"language":[{"iso":"eng"}],"OA_place":"publisher","type":"journal_article","publication_status":"published","file":[{"relation":"main_file","date_created":"2026-03-02T09:24:44Z","file_name":"2026_JPhysPhotonics_Volpe.pdf","checksum":"172720f1f0c5c9d06a282e52023a0030","success":1,"file_id":"21376","date_updated":"2026-03-02T09:24:44Z","access_level":"open_access","file_size":16789781,"content_type":"application/pdf","creator":"dernst"}],"author":[{"last_name":"Al Hyder","id":"d1c405be-ae15-11ed-8510-ccf53278162e","first_name":"Ragheed","full_name":"Al Hyder, Ragheed"},{"first_name":"G. M.","full_name":"Bruun, G. M.","last_name":"Bruun"},{"last_name":"Pohl","full_name":"Pohl, T.","first_name":"T."},{"last_name":"Lemeshko","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","first_name":"Mikhail","orcid":"0000-0002-6990-7802","full_name":"Lemeshko, Mikhail"},{"id":"37D278BC-F248-11E8-B48F-1D18A9856A87","last_name":"Volosniev","orcid":"0000-0003-0393-5525","full_name":"Volosniev, Artem","first_name":"Artem"}],"year":"2026","intvolume":"         8","doi":"10.1103/16dk-5dgx","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"American Physical Society","corr_author":"1","license":"https://creativecommons.org/licenses/by/4.0/","oa_version":"Published Version","DOAJ_listed":"1","day":"06","date_published":"2026-02-06T00:00:00Z","tmp":{"short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png"},"publication_identifier":{"issn":["2643-1564"]},"PlanS_conform":"1","article_processing_charge":"No","title":"Phenomenological model of decaying Bose polarons","department":[{"_id":"MiLe"}],"publication":"Physical Review Research","_id":"21373","arxiv":1,"ddc":["530"],"oa":1,"volume":8,"date_created":"2026-03-01T23:01:39Z","acknowledgement":"We thank Georgios Koutentakis, Frédéric Chevy, Hussam Al Daas, and Richard Schmidt for fruitful discussions; Jan Arlt for sharing their experimental data and many fruitful discussions; and Christoph Eigen for sharing their experimental data and inspiring discussions. R.A., T.P., and G.M.B. have been supported in part by the Danish National Research Foundation through the Center of Excellence “CCQ” (Grant Agreement No. DNRF156) and the Independent Research Fund Denmark–Natural Sciences via Grant No. DFF-8021-00233B. R.A., A.G.V., and M.L. acknowledge support by the European Research Council (ERC) Starting Grant No. 801770 (ANGULON). R.A. received funding from the Austrian Academy of Science ÖAW Grant No. PR1029OEAW03.","OA_type":"gold","abstract":[{"text":"Cold atom experiments show that a mobile impurity particle immersed in a weakly interacting Bose-Einstein condensate forms a well-defined quasiparticle (Bose polaron) for weak to moderate impurity-boson interaction strengths, whereas a significant line broadening is consistently observed for strong interactions. Motivated by this, we introduce a phenomenological theory based on the assumption that the most relevant states are characterized by the impurity correlated with at most one boson, since they have the largest overlap with the uncorrelated states to which the most common experimental probes couple. These experimentally relevant states can, however, decay to lower energy states characterized by correlations involving multiple bosons, and we model this using a minimal variational wave function combined with a complex impurity-boson interaction strength. We first motivate this approach by comparing to a more elaborate theory that includes correlations with up to two bosons. Our phenomenological model is shown to recover the main results of two recent experiments probing both the spectral and the nonequilibrium properties of the Bose polaron. Our work offers an intuitive framework for analyzing experimental data and highlights the importance of understanding the complicated problem of the Bose polaron decay in a many-body setting.","lang":"eng"}],"project":[{"_id":"2688CF98-B435-11E9-9278-68D0E5697425","grant_number":"801770","call_identifier":"H2020","name":"Angulon: physics and applications of a new quasiparticle"},{"_id":"8fa7db46-16d5-11f0-9cad-917600954daf","grant_number":"12078","name":"Polarons in Lead Halide Perovskites"}],"quality_controlled":"1","status":"public","external_id":{"arxiv":["2507.04143"]},"article_type":"letter_note","has_accepted_license":"1","month":"02","article_number":"L012034","ec_funded":1,"file_date_updated":"2026-03-02T09:24:44Z","date_updated":"2026-03-02T09:27:26Z","citation":{"ieee":"R. Al Hyder, G. M. Bruun, T. Pohl, M. Lemeshko, and A. Volosniev, “Phenomenological model of decaying Bose polarons,” <i>Physical Review Research</i>, vol. 8. American Physical Society, 2026.","apa":"Al Hyder, R., Bruun, G. M., Pohl, T., Lemeshko, M., &#38; Volosniev, A. (2026). Phenomenological model of decaying Bose polarons. <i>Physical Review Research</i>. American Physical Society. <a href=\"https://doi.org/10.1103/16dk-5dgx\">https://doi.org/10.1103/16dk-5dgx</a>","ama":"Al Hyder R, Bruun GM, Pohl T, Lemeshko M, Volosniev A. Phenomenological model of decaying Bose polarons. <i>Physical Review Research</i>. 2026;8. doi:<a href=\"https://doi.org/10.1103/16dk-5dgx\">10.1103/16dk-5dgx</a>","short":"R. Al Hyder, G.M. Bruun, T. Pohl, M. Lemeshko, A. Volosniev, Physical Review Research 8 (2026).","mla":"Al Hyder, Ragheed, et al. “Phenomenological Model of Decaying Bose Polarons.” <i>Physical Review Research</i>, vol. 8, L012034, American Physical Society, 2026, doi:<a href=\"https://doi.org/10.1103/16dk-5dgx\">10.1103/16dk-5dgx</a>.","ista":"Al Hyder R, Bruun GM, Pohl T, Lemeshko M, Volosniev A. 2026. Phenomenological model of decaying Bose polarons. Physical Review Research. 8, L012034.","chicago":"Al Hyder, Ragheed, G. M. Bruun, T. Pohl, Mikhail Lemeshko, and Artem Volosniev. “Phenomenological Model of Decaying Bose Polarons.” <i>Physical Review Research</i>. American Physical Society, 2026. <a href=\"https://doi.org/10.1103/16dk-5dgx\">https://doi.org/10.1103/16dk-5dgx</a>."},"scopus_import":"1"}