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PreprintCC BY-NC-ND 4.0arXiv

Remote magnon sensing detects the universal phase stiffness jump in Bi2Sr2CaCu2O8+δ

  • Yue Sun
  • Mai Nguyen
  • Naiyuan James Zhang
  • Dingbin Huang
  • Shuai Yuan
  • Aljoscha Söll
  • Arun Ramanathan
  • Takashi Taniguchi
  • Kenji Watanabe
  • Xavier Roy
  • Zdeněk Sofer
  • Shigeyuki Ishida
5 more authors
  • Hiroshi Eisaki
  • Makoto Hashimoto
  • Zhi-Xun Shen
  • Joseph Orenstein
  • Xiaodong Xu
Open at sourcePDFDOICite

Abstract

Phase stiffness governs macroscopic quantum coherence in superfluids and superconductors, providing a sensitive probe of condensate depletion, fluctuations, and phase transitions. However quantitative and spatially resolved measurements remain challenging. Here we report a contactless, local, all-optical measurement of superconducting phase stiffness using propagating antiferromagnetic magnons as remote sensors. In CrSBr, strong exciton-magnon coupling enables optical excitation and detection of magnon wavepackets and precise determination of their group velocity. When CrSBr is interfaced with underdoped Bi2Sr2CaCu2O8+δ, we find that the magnon group velocity is substantially enhanced below the superconducting transition and quantitatively encodes the phase stiffness through Meissner screening currents. Using this capability, we identify a parallel-field-induced Berezinskii-Kosterlitz-Thouless transition through direct observation of the universal phase-stiffness jump, revealing a field-controlled route to expose intrinsic two-dimensional phase-ordering physics in a bulk cuprate. Our work establishes propagating magnons as local probes of superconducting electrodynamics and phase-coherent phenomena in low-dimensional quantum materials.

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Cite

BibTeXRIS
BibTeX
@misc{sun2026remote,
  title = {{Remote magnon sensing detects the universal phase stiffness jump in Bi$_2$Sr$_2$CaCu$_2$O$_8+δ$}},
  author = {Yue Sun and Mai Nguyen and Naiyuan James Zhang and Dingbin Huang and Shuai Yuan and Aljoscha Söll and Arun Ramanathan and Takashi Taniguchi and Kenji Watanabe and Xavier Roy and Zdeněk Sofer and Shigeyuki Ishida and Hiroshi Eisaki and Makoto Hashimoto and Zhi-Xun Shen and Joseph Orenstein and Xiaodong Xu},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.08934},
  eprint = {2610.08934},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.08934},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - UNPB
TI  - Remote magnon sensing detects the universal phase stiffness jump in Bi_2Sr_2CaCu_2O_8+δ
AU  - Yue Sun
AU  - Mai Nguyen
AU  - Naiyuan James Zhang
AU  - Dingbin Huang
AU  - Shuai Yuan
AU  - Aljoscha Söll
AU  - Arun Ramanathan
AU  - Takashi Taniguchi
AU  - Kenji Watanabe
AU  - Xavier Roy
AU  - Zdeněk Sofer
AU  - Shigeyuki Ishida
AU  - Hiroshi Eisaki
AU  - Makoto Hashimoto
AU  - Zhi-Xun Shen
AU  - Joseph Orenstein
AU  - Xiaodong Xu
PY  - 2026
DA  - 2026/10/06
PB  - arXiv
DO  - 10.48550/arxiv.2610.08934
UR  - https://arxiv.org/abs/2610.08934
AB  - Phase stiffness governs macroscopic quantum coherence in superfluids and superconductors, providing a sensitive probe of condensate depletion, fluctuations, and phase transitions. However quantitative and spatially resolved measurements remain challenging. Here we report a contactless, local, all-optical measurement of superconducting phase stiffness using propagating antiferromagnetic magnons as remote sensors. In CrSBr, strong exciton-magnon coupling enables optical excitation and detection of magnon wavepackets and precise determination of their group velocity. When CrSBr is interfaced with underdoped Bi_2Sr_2CaCu_2O_8+δ, we find that the magnon group velocity is substantially enhanced below the superconducting transition and quantitatively encodes the phase stiffness through Meissner screening currents. Using this capability, we identify a parallel-field-induced Berezinskii-Kosterlitz-Thouless transition through direct observation of the universal phase-stiffness jump, revealing a field-controlled route to expose intrinsic two-dimensional phase-ordering physics in a bulk cuprate. Our work establishes propagating magnons as local probes of superconducting electrodynamics and phase-coherent phenomena in low-dimensional quantum materials.
ER  -