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PreprintarXiv licencearXiv

Superconductivity in doped spin multimer systems

  • Ritsuki Hirabayashi
  • Masataka Kakoi
  • Ryota Ueda
  • Kazuhiko Kuroki
  • Tatsuya Kaneko
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Abstract

Binding energy, which quantifies pair formation, is a key factor in the emergence of superconductivity. Here, we show that even when multiple spins are complexly coupled, hole-doped systems can be mapped, in the strong-binding-energy limit, onto an effective hardcore boson model equivalent to the XXZ model, and exhibit promising signatures of superconductivity. We demonstrate this theory analytically and numerically in the double Kondo lattice model. Using the density-matrix renormalization group method, we show that a pairing state is maintained via a crossover even for parameters away from the strong-coupling regime. Additionally, we find that once binding energies are sufficiently generated, pair correlations develop similarly regardless of the details of local spin correlations. Our findings provide useful insights into the mechanism of superconductivity.

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Cite

BibTeXRIS
BibTeX
@misc{hirabayashi2026superconductivity,
  title = {{Superconductivity in doped spin multimer systems}},
  author = {Ritsuki Hirabayashi and Masataka Kakoi and Ryota Ueda and Kazuhiko Kuroki and Tatsuya Kaneko},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2605.22128},
  eprint = {2605.22128},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.22128},
}
RIS
TY  - UNPB
TI  - Superconductivity in doped spin multimer systems
AU  - Ritsuki Hirabayashi
AU  - Masataka Kakoi
AU  - Ryota Ueda
AU  - Kazuhiko Kuroki
AU  - Tatsuya Kaneko
PY  - 2026
DA  - 2026/10/30
PB  - arXiv
DO  - 10.48550/arxiv.2605.22128
UR  - https://arxiv.org/abs/2605.22128
AB  - Binding energy, which quantifies pair formation, is a key factor in the emergence of superconductivity. Here, we show that even when multiple spins are complexly coupled, hole-doped systems can be mapped, in the strong-binding-energy limit, onto an effective hardcore boson model equivalent to the XXZ model, and exhibit promising signatures of superconductivity. We demonstrate this theory analytically and numerically in the double Kondo lattice model. Using the density-matrix renormalization group method, we show that a pairing state is maintained via a crossover even for parameters away from the strong-coupling regime. Additionally, we find that once binding energies are sufficiently generated, pair correlations develop similarly regardless of the details of local spin correlations. Our findings provide useful insights into the mechanism of superconductivity.
ER  -