Journal article Stable vortices in the anomalous metallic state observed on monoatomic-layer superconductors
Yudai Sato (author) (Search by this author)
ORCID https://orcid.org/0000-0003-0494-7026 (unauthenticated)
ORCID ;
Masahiro Haze (author) (Search by this author)
ORCID https://orcid.org/0000-0001-7274-2909 (unauthenticated)
ORCID ; ORCID SAMURAI ; ORCID SAMURAI ; ORCID SAMURAI ; ORCID SAMURAI ;
Yukio Hasegawa (author) (Search by this author)
ORCID https://orcid.org/0000-0002-6674-4745 (unauthenticated)
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Citation
Yudai Sato, Masahiro Haze, Ryohei Nemoto, Wenxuan Qian, Shunsuke Yoshizawa, Takashi Uchihashi, Yukio Hasegawa. Stable vortices in the anomalous metallic state observed on monoatomic-layer superconductors. Science Advances. 2026, 12 (12), eadu9610. https://doi.org/10.1126/sciadv.adu9610

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(abstract)

The superconductor-insulator transition in two-dimensional (2D) systems has been extensively studied as a typical example of quantum phase transition. Recent investigations of highly conductive 2D systems have revealed an intervening metallic regime, in which the electrical resistivity saturates at the limit of zero temperature . The nature and origin of this metallicity remain debated, partly because of the lack of microscopic understanding. In this study, using scanning tunneling spectroscopy we investigate the metallic state and other phases observed in crystalline Pb monoatomic-layer superconductors formed on vicinal semiconducting substrates. Our spectroscopic images reveal stable and isolated vortices in the metallic regime, distinct from delocalized or liquidized vortices. These findings suggest that the saturated resistance in the metallic state arises from the pinning-free vortex motion driven by the finite current applied for the transport measurements. Our disorder-controlled microscopic experiments provide new insights into the fluctuation-induced phases of ultrathin crystalline two-dimensional superconductors.

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Keyword: superconductivity

Date published: 2026-03-20

Publisher: American Association for the Advancement of Science (AAAS)

Journal:

  • Science Advances (ISSN: 23752548) vol. 12 issue. 12 eadu9610

Funding:

  • Support for Pioneering Research Initiated by the Next Generation JPMJSP 2108
  • the Grants-in-Aid for Scientific Research JP18H01876
  • the Grants-in-Aid for Scientific Research JP19H00859
  • the Grants-in-Aid for Scientific Research JP20K15166
  • the Grants-in-Aid for Scientific Research JP20K20904
  • the Grants-in-Aid for Scientific Research JP21H01817
  • the Grants-in-Aid for Scientific Research JP22H01961
  • the Grants-in-Aid for Scientific Research JP22KJ0920
  • the Grants-in-Aid for Scientific Research JP22H00292
  • the Grants-in-Aid for Scientific Research JP22K14598

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1126/sciadv.adu9610

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Updated at: 2026-03-23 09:31:57 +0900

Published on MDR: 2026-03-23 12:27:16 +0900

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