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Description:

Atomically thin cuprates exhibiting a superconducting phase transition temperature similar to bulk have recently been realized, although the device fabrication remains a challenge and limits the potential for many novel studies and applications. Here we use an optical pump-probe approach to noninvasively study the unconventional superconductivity in atomically thin Bi₂Sr₂Ca_0.92Y_0.08Cu₂O_8+δ (Y-Bi2212). Apart from finding an optical response due to the superconducting phase transition that is similar to bulk Y-Bi2212, we observe that the sign and amplitude of the pump-probe signal in the atomically thin flake vary significantly in different dielectric environments depending on the nature of the optical excitation. By exploiting the spatial resolution of the optical probe, we uncover the exceptional sensitivity of monolayer Y-Bi2212 to the environment. Our results provide the first optical evidence for the intralayer nature of the superconducting condensate in Bi2212, and highlight the role of double-sided encapsulation in preserving superconductivity in atomically thin cuprates.

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• In Copyright
  

  This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © 2024 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.nanolett.4c00559.

Keyword: 2D materials, cuprate, high-Tc superconductivity, optical pump-probe spectroscopy

Date published: 2024-04-03

Publisher: American Chemical Society (ACS)

Journal:

• Nano Letters (ISSN: 15306984) vol. 24 issue. 13 p. 3986-3993

Funding:

• Minist?re de la D?fense Nationale
• Gordon and Betty Moore Foundation GBMF11071
• Canada Foundation for Innovation
• Canada Research Chairs
• U.S. Department of Energy DE-SC0016371
• Canada First Research Excellence Fund
• Natural Sciences and Engineering Research Council of Canada
• Canadian Institute for Advanced Research
• British Columbia Knowledge Development Fund
• Quantum Materials and Future Technologies Program
• Max Planck-UBC-UTokyo Center for Quantum Materials

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1021/acs.nanolett.4c00559

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Updated at: 2025-08-27 12:30:33 +0900

Published on MDR: 2025-08-27 12:18:06 +0900