[{"issue":"19","date_created":"2026-10-02T08:33:31Z","volume":114,"acknowledgement":"We acknowledge useful discussions with Anton Bubis, Vladimir Manucharyan, Alexander Mirlin, and Thomas Scaffidi. We are grateful to Eli Levenson-Falk and Alexander Mirlin for their feedback on the manuscript. This research was supported in part by Grant NSF PHY-2309135 to the Kavli Institute for Theoretical Physics (KITP), and by the Austrian Science Fund (FWF) SFB F86.","has_accepted_license":"1","publication":"Physical Review B","das_tickbox":"1","oa":1,"dataavailabilitystatement":"The data and the source code that support the findings of this paper are openly available at: https://doi.org/10.5281/zenodo.19456426.","file":[{"date_updated":"2026-10-07T09:39:01Z","file_id":"23069","file_name":"2026_PhysicalReviewB_Vigliotti.pdf","date_created":"2026-10-07T09:39:01Z","content_type":"application/pdf","file_size":2531016,"access_level":"open_access","success":1,"creator":"dernst","relation":"main_file","checksum":"95db327e1005564d09334763789ad7ae"}],"article_type":"original","supplementarymaterial":"yes","date_updated":"2026-10-07T09:42:41Z","publisher":"American Physical Society","type":"journal_article","publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"year":"2026","date_published":"2026-10-01T00:00:00Z","abstract":[{"text":"Josephson junction (JJ) chains combine the coherence of superconductivity with the controllability of microwave-frequency circuits, making them a powerful platform for circuit quantum electrodynamics. In this work, we consider a long JJ chain that effectively realizes a multimode cavity with nonlinear dispersion and additional multimode interactions. Individual modes appearing due to the finite size of the chain can be experimentally probed via microwave spectroscopy, both in equilibrium and in driven far-from-equilibrium settings. We study the role of multimode interactions in degrading internal coherence—observable as excess linewidth—in both equilibrium and driven regimes. Focusing on two-into-two mode scattering as the leading relaxation process, we classify the relevant scattering processes and derive their expected temperature- and frequency-scaling under equilibrium conditions. For experimentally relevant parameters, we show that the equilibrium decay rate is dominated by nonresonant processes, however, weakly driving a particular set of modes out of equilibrium enhances resonant scattering, leading to observable signatures in the distribution function and linewidth. Finally, in the strong nonequilibrium regime, we report a crossover to a qualitatively different nonequilibrium steady state.","lang":"eng"}],"researchdata_availability":"yes","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ista":"Vigliotti L, Higginbotham AP, Serbyn M. 2026. Plasmon decay and nonequilibrium steady states in Josephson junction chains. Physical Review B. 114(19), 194501.","mla":"Vigliotti, Lucia, et al. “Plasmon Decay and Nonequilibrium Steady States in Josephson Junction Chains.” <i>Physical Review B</i>, vol. 114, no. 19, 194501, American Physical Society, 2026, doi:<a href=\"https://doi.org/10.1103/cw3m-thsw\">10.1103/cw3m-thsw</a>.","apa":"Vigliotti, L., Higginbotham, A. P., &#38; Serbyn, M. (2026). Plasmon decay and nonequilibrium steady states in Josephson junction chains. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/cw3m-thsw\">https://doi.org/10.1103/cw3m-thsw</a>","short":"L. Vigliotti, A.P. Higginbotham, M. Serbyn, Physical Review B 114 (2026).","ieee":"L. Vigliotti, A. P. Higginbotham, and M. Serbyn, “Plasmon decay and nonequilibrium steady states in Josephson junction chains,” <i>Physical Review B</i>, vol. 114, no. 19. American Physical Society, 2026.","chicago":"Vigliotti, Lucia, Andrew P Higginbotham, and Maksym Serbyn. “Plasmon Decay and Nonequilibrium Steady States in Josephson Junction Chains.” <i>Physical Review B</i>. American Physical Society, 2026. <a href=\"https://doi.org/10.1103/cw3m-thsw\">https://doi.org/10.1103/cw3m-thsw</a>.","ama":"Vigliotti L, Higginbotham AP, Serbyn M. Plasmon decay and nonequilibrium steady states in Josephson junction chains. <i>Physical Review B</i>. 2026;114(19). doi:<a href=\"https://doi.org/10.1103/cw3m-thsw\">10.1103/cw3m-thsw</a>"},"title":"Plasmon decay and nonequilibrium steady states in Josephson junction chains","month":"10","project":[{"_id":"34a7f947-11ca-11ed-8bc3-c5dc2bbaae25","name":"Center for Correlated Quantum Materials and Solid State Quantum Systems:  Probing topology in circuits and quantum materials","grant_number":"F8609"}],"day":"01","language":[{"iso":"eng"}],"OA_type":"hybrid","publication_status":"published","file_date_updated":"2026-10-07T09:39:01Z","department":[{"_id":"MaSe"},{"_id":"AnHi"}],"tmp":{"image":"/images/cc_by.png","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)"},"article_number":"194501","external_id":{"arxiv":["2603.06371"]},"arxiv":1,"OA_place":"publisher","article_processing_charge":"Yes (via OA deal)","PlanS_conform":"1","scopus_import":"1","_id":"23029","quality_controlled":"1","author":[{"first_name":"Lucia","full_name":"Vigliotti, Lucia","id":"539e1e1a-e604-11ee-a1df-f02b018e5c8c","last_name":"Vigliotti"},{"last_name":"Higginbotham","orcid":"0000-0003-2607-2363","id":"4AD6785A-F248-11E8-B48F-1D18A9856A87","full_name":"Higginbotham, Andrew P","first_name":"Andrew P"},{"orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","first_name":"Maksym","full_name":"Serbyn, Maksym"}],"status":"public","intvolume":"       114","doi":"10.1103/cw3m-thsw","oa_version":"Published Version","corr_author":"1","ddc":["530"],"fulldoi":"https://doi.org/10.1103/cw3m-thsw"}]