Quasiparticle GW for Superconductors: Toward a Unified Treatment of Electron-Phonon and Electron-Plasmon Couplings

[2605.21700] Quasiparticle GW for Superconductors: Toward a Unified Treatment of Electron-Phonon and Electron-Plasmon Couplings Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Condensed Matter > Superconductivity arXiv:2605.21700 (cond-mat) [Submitted on 20 May 2026 ( v1 ), last revised 24 Jul 2026 (this version, v2)] Title: Quasiparticle GW for Superconductors: Toward a Unified Treatment of Electron-Phonon and Electron-Plasmon Couplings Authors: Catalin D. Spataru , Christopher Renskers , Elena R. Margine View a PDF of the paper titled Quasiparticle GW for Superconductors: Toward a Unified Treatment of Electron-Phonon and Electron-Plasmon Couplings, by Catalin D. Spataru and 2 other authors View PDF HTML (experimental) Abstract: Superconducting two-dimensional materials, and in particular few-layer graphene, offer an exciting platform for low-power electronics, yet the origin of their unconventional superconductivity remains an open question. Prevailing theories, primarily rooted in the Bardeen-Cooper-Schrieffer (BCS) framework that assumes electron-phonon interactions are the main mechanism of superconductivity, struggle to account quantitatively for the observed phenomena. Recent studies point to a plasmonic pairing mechanism in graphene systems; however, disentangling the relative contributions of phonon- and plasmon-mediated pairing remains challenging due to the lack of a satisfactory first-principles framework capable of accurately capturing dynamical screening effects in the electronic channel. Here, we present a new theoretical framework that extends the quasiparticle self-consistent GW method to the superconducting phase by coupling it with the Eliashberg treatment of both phonon- and plasmon-mediated interactions. Our approach, termed superconducting quasiparticle GW (s-qpGW), is on par with the state-of-the-art Eliashberg theory of superconductivity when applied to bulk metals, and correctly predicts the absence of superconductivity in doped monolayer graphene. To differentiate s-qpGW from conventional Eliashberg approaches, we study a simple model system, graphene with an artificially enhanced density of states, and demonstrate that s-qpGW captures dynamical Coulomb screening effects in ways that standard BCS theory cannot. Comments: 20 pages, 7 figures, accepted in PRB and selected as an Editors' Suggestion Subjects: Superconductivity (cond-mat.supr-con) Cite as: arXiv:2605.21700 [cond-mat.supr-con] (or arXiv:2605.21700v2 [cond-mat.supr-con] for this version) https://doi.org/10.48550/arXiv.2605.21700 Focus to learn more arXiv-issued DOI via DataCite Journal reference: Phys Rev B 114, 094501 (2026) Related DOI : https://doi.org/10.1103/f8qb-2l59 Focus to learn more DOI(s) linking to related resources Submission history From: Catalin D. Spataru [ view email ] [v1] Wed, 20 May 2026 20:01:11 UTC (1,132 KB) [v2] Fri, 24 Jul 2026 22:36:31 UTC (2,091 KB) Full-text links: Access Paper: View a PDF of the paper titled Quasiparticle GW for Superconductors: Toward a Unified Treatment of Electron-Phonon and Electron-Plasmon Couplings, by Catalin D. 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