Surface-localized topological superconductivity in nodal-loop materials: BdG analysis

[2602.22837] Surface-localized topological superconductivity in nodal-loop materials: BdG analysis Skip to main content Search Submit Donate Log in Condensed Matter > Superconductivity arXiv:2602.22837 (cond-mat) [Submitted on 26 Feb 2026 ( v1 ), last revised 28 Aug 2026 (this version, v3)] Title: Surface-localized topological superconductivity in nodal-loop materials: BdG analysis Authors: Takeru Matsushima , Hiroki Tsuchiura View PDF HTML (experimental) Abstract: We theoretically study surface superconductivity in a nodal-line semimetal by combining a minimal tight-binding model with a layer-resolved Bogoliubov-de Gennes approach. In the normal state, the model realizes a bulk nodal loop and an associated drumhead surface band in a slab geometry with open boundaries in the $z$ direction: the central layers reproduce the bulk-like density of states, whereas the surface layer exhibits a sharp zero-energy peak originating from the drumhead states. On top of this band structure we introduce chiral $p$-wave and $d_{x^2-y^2}$-wave superconducting channels and determine the layer-dependent gap amplitudes self-consistently. The chiral $p$-wave order parameter is strongly enhanced at the outermost layers and decays within only a few layers towards the interior, while the $d$-wave order parameter is more than an order of magnitude smaller on all layers. The quasiparticle dispersion and surface local density of states in the chiral $p$-wave state show that the drumhead band is efficiently gapped out and that the zero-energy peak in the normal surface spectrum is split into two coherence peaks, directly reflecting the induced superconducting gap. These results demonstrate that superconductivity driven by drumhead surface states is naturally biased toward a surface-localized chiral $p$-wave pairing symmetry and may offer qualitative guidance for interpreting surface-sensitive experiments on Pd-doped CaAgP. Comments: 8 pages, 7 figures. Proceedings of the 38th International Symposium on Superconductivity (ISS2025) Subjects: Superconductivity (cond-mat.supr-con) ; Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Cite as: arXiv:2602.22837 [cond-mat.supr-con] (or arXiv:2602.22837v3 [cond-mat.supr-con] for this version) https://doi.org/10.48550/arXiv.2602.22837 Focus to learn more arXiv-issued DOI via DataCite Journal reference: J. Phys.: Conf. Ser. 3278, 012002 (2026) Related DOI : https://doi.org/10.1088/1742-6596/3278/1/012002 Focus to learn more DOI(s) linking to related resources Submission history From: Takeru Matsushima [ view email ] [v1] Thu, 26 Feb 2026 10:24:55 UTC (809 KB) [v2] Fri, 20 Mar 2026 05:11:29 UTC (822 KB) [v3] Fri, 28 Aug 2026 04:02:23 UTC (822 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: cond-mat.supr-con < prev | next > new | recent | 2026-02 Change to browse by: cond-mat cond-mat.mes-hall References & Citations NASA ADS Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) IArxiv recommender toggle IArxiv Recommender ( What is IArxiv? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. 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