{"author":[{"full_name":"Zeng, Zhongda","last_name":"Zeng","first_name":"Zhongda"},{"first_name":"Enderalp","last_name":"Yakaboylu","id":"38CB71F6-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-5973-0874","full_name":"Yakaboylu, Enderalp"},{"id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","last_name":"Lemeshko","first_name":"Mikhail","orcid":"0000-0002-6990-7802","full_name":"Lemeshko, Mikhail"},{"full_name":"Shi, Tao","last_name":"Shi","first_name":"Tao"},{"last_name":"Schmidt","first_name":"Richard","full_name":"Schmidt, Richard"}],"type":"journal_article","intvolume":"       158","publication_identifier":{"eissn":["1089-7690"]},"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"date_updated":"2023-08-01T14:08:47Z","date_published":"2023-04-07T00:00:00Z","publication_status":"published","quality_controlled":"1","has_accepted_license":"1","day":"07","article_processing_charge":"No","article_number":"134301","isi":1,"acknowledgement":"We thank Ignacio Cirac, Christian Schmauder, and Henrik Stapelfeldt for their valuable discussions. We acknowledge support by the Max Planck Society and the Deutsche Forschungsgemeinschaft under Germany’s Excellence Strategy EXC 2181/1—390900948 (the Heidelberg STRUCTURES Excellence Cluster). M.L. acknowledges support from the European Research Council (ERC) Starting Grant No. 801770 (ANGULON). T.S. is supported by the National Key Research and Development Program of China (Grant No. 2017YFA0718304) and the National Natural Science Foundation of China (Grant Nos. 11974363, 12135018, and 12047503).","abstract":[{"lang":"eng","text":"The angulon, a quasiparticle formed by a quantum rotor dressed by the excitations of a many-body bath, can be used to describe an impurity rotating in a fluid or solid environment. Here, we propose a coherent state ansatz in the co-rotating frame, which provides a comprehensive theoretical description of angulons. We reveal the quasiparticle properties, such as energies, quasiparticle weights, and spectral functions, and show that our ansatz yields a persistent decrease in the impurity’s rotational constant due to many-body dressing, which is consistent with experimental observations. From our study, a picture of the angulon emerges as an effective spin interacting with a magnetic field that is self-consistently generated by the molecule’s rotation. Moreover, we discuss rotational spectroscopy, which focuses on the response of rotating molecules to a laser perturbation in the linear response regime. Importantly, we take into account initial-state interactions that have been neglected in prior studies and reveal their impact on the excitation spectrum. To examine the angulon instability regime, we use a single-excitation ansatz and obtain results consistent with experiments, in which a broadening of spectral lines is observed while phonon wings remain highly suppressed due to initial-state interactions."}],"date_created":"2023-04-16T22:01:07Z","language":[{"iso":"eng"}],"publisher":"American Institute of Physics","oa":1,"file":[{"access_level":"open_access","relation":"main_file","checksum":"8d801babea4df48e08895c76571bb19e","file_id":"12841","success":1,"file_name":"2023_JourChemicalPhysics_Zeng.pdf","content_type":"application/pdf","date_updated":"2023-04-17T07:28:38Z","date_created":"2023-04-17T07:28:38Z","file_size":7388057,"creator":"dernst"}],"doi":"10.1063/5.0135893","file_date_updated":"2023-04-17T07:28:38Z","title":"Variational theory of angulons and their rotational spectroscopy","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"13","department":[{"_id":"MiLe"}],"external_id":{"isi":["000970038800001"],"arxiv":["2211.08070"]},"citation":{"ama":"Zeng Z, Yakaboylu E, Lemeshko M, Shi T, Schmidt R. Variational theory of angulons and their rotational spectroscopy. <i>The Journal of Chemical Physics</i>. 2023;158(13). doi:<a href=\"https://doi.org/10.1063/5.0135893\">10.1063/5.0135893</a>","ieee":"Z. Zeng, E. Yakaboylu, M. Lemeshko, T. Shi, and R. Schmidt, “Variational theory of angulons and their rotational spectroscopy,” <i>The Journal of Chemical Physics</i>, vol. 158, no. 13. American Institute of Physics, 2023.","ista":"Zeng Z, Yakaboylu E, Lemeshko M, Shi T, Schmidt R. 2023. Variational theory of angulons and their rotational spectroscopy. The Journal of Chemical Physics. 158(13), 134301.","chicago":"Zeng, Zhongda, Enderalp Yakaboylu, Mikhail Lemeshko, Tao Shi, and Richard Schmidt. “Variational Theory of Angulons and Their Rotational Spectroscopy.” <i>The Journal of Chemical Physics</i>. American Institute of Physics, 2023. <a href=\"https://doi.org/10.1063/5.0135893\">https://doi.org/10.1063/5.0135893</a>.","short":"Z. Zeng, E. Yakaboylu, M. Lemeshko, T. Shi, R. Schmidt, The Journal of Chemical Physics 158 (2023).","apa":"Zeng, Z., Yakaboylu, E., Lemeshko, M., Shi, T., &#38; Schmidt, R. (2023). Variational theory of angulons and their rotational spectroscopy. <i>The Journal of Chemical Physics</i>. American Institute of Physics. <a href=\"https://doi.org/10.1063/5.0135893\">https://doi.org/10.1063/5.0135893</a>","mla":"Zeng, Zhongda, et al. “Variational Theory of Angulons and Their Rotational Spectroscopy.” <i>The Journal of Chemical Physics</i>, vol. 158, no. 13, 134301, American Institute of Physics, 2023, doi:<a href=\"https://doi.org/10.1063/5.0135893\">10.1063/5.0135893</a>."},"_id":"12831","month":"04","year":"2023","article_type":"original","scopus_import":"1","ddc":["530"],"project":[{"_id":"2688CF98-B435-11E9-9278-68D0E5697425","name":"Angulon: physics and applications of a new quasiparticle","grant_number":"801770","call_identifier":"H2020"}],"volume":158,"publication":"The Journal of Chemical Physics","oa_version":"Published Version","ec_funded":1,"status":"public"}