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Peer-reviewedCC BYnpj Quantum Materials

Superconductivity from doping symmetric mass generation insulators: application to La3Ni2O7 under pressure

  • Da-Chuan Lu1
  • Miao Li2
  • Zhao-Yi Zeng3
  • Wanda Hou1
  • Juven Wang4,5
  • Fan Yang6
  • Yi‐Zhuang You1
6 affiliations
  1. 1Department of Physics, University of California, San Diego, CA, USA
  2. 2School of Physics, Zhejiang University, Hangzhou, China
  3. 3School of Physics, Fudan University, Shanghai, China
  4. 4Center of Mathematical Sciences and Applications, Harvard University, Cambridge, MA, USA
  5. 5London Institute for Mathematical Sciences, Royal Institution, London, UK
  6. 6School of Physics, Beijing Institute of Technology, Beijing, China
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Abstract

We investigate the bilayer nickelates as a platform to realize the symmetric mass generation (SMG) insulator, a featureless Mott insulator that arises due to the Lieb-Schultz-Mattis (LSM) anomaly cancellation in bilayer spin-1/2 lattice systems. Through a single-orbital bilayer square lattice model involving intralayer hopping t and interlayer superexchange interaction J , we demonstrate the emergence of high-temperature superconductivity (SC) upon doping the SMG insulator. The SC phase features s -wave interlayer spin-singlet pairing and exhibits a crossover between the Bardeen-Cooper-Schrieffer (BCS) and Bose-Einstein condensation (BEC) limits by tuning the J / t ratio. We estimate the SC transition temperature T c from both the weak and strong coupling limits at the mean-field level. Our findings offer insights into the experimentally observed decrease in T c with pressure and the strange metal behavior above T c . Additionally, we propose that both Ni 3dz2 3 d z 2 and 3dx2−y2 3 d x 2 − y 2 orbitals can exhibit superconductivity in La 3 Ni 2 O 7 under pressure, but their T c should vary in opposite ways under doping. This characteristic difference suggests a potential experimental pathway to identify which electronic orbital plays the principal role in the formation of superconductivity in this system.

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Cite

BibTeXRIS
BibTeX
@article{lu2026superconductivity,
  title = {{Superconductivity from doping symmetric mass generation insulators: application to La3Ni2O7 under pressure}},
  author = {Da-Chuan Lu and Miao Li and Zhao-Yi Zeng and Wanda Hou and Juven Wang and Fan Yang and Yi‐Zhuang You},
  journal = {npj Quantum Materials},
  year = {2026},
  month = aug,
  doi = {10.1038/s41535-026-00925-0},
  url = {https://doi.org/10.1038/s41535-026-00925-0},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Superconductivity from doping symmetric mass generation insulators: application to La3Ni2O7 under pressure
AU  - Da-Chuan Lu
AU  - Miao Li
AU  - Zhao-Yi Zeng
AU  - Wanda Hou
AU  - Juven Wang
AU  - Fan Yang
AU  - Yi‐Zhuang You
PY  - 2026
DA  - 2026/08/17
JO  - npj Quantum Materials
DO  - 10.1038/s41535-026-00925-0
UR  - https://doi.org/10.1038/s41535-026-00925-0
AB  - We investigate the bilayer nickelates as a platform to realize the symmetric mass generation (SMG) insulator, a featureless Mott insulator that arises due to the Lieb-Schultz-Mattis (LSM) anomaly cancellation in bilayer spin-1/2 lattice systems. Through a single-orbital bilayer square lattice model involving intralayer hopping t and interlayer superexchange interaction J , we demonstrate the emergence of high-temperature superconductivity (SC) upon doping the SMG insulator. The SC phase features s -wave interlayer spin-singlet pairing and exhibits a crossover between the Bardeen-Cooper-Schrieffer (BCS) and Bose-Einstein condensation (BEC) limits by tuning the J / t ratio. We estimate the SC transition temperature T c from both the weak and strong coupling limits at the mean-field level. Our findings offer insights into the experimentally observed decrease in T c with pressure and the strange metal behavior above T c . Additionally, we propose that both Ni 3d_z^2 3 d z 2 and 3d_x^2−y^2 3 d x 2 − y 2 orbitals can exhibit superconductivity in La 3 Ni 2 O 7 under pressure, but their T c should vary in opposite ways under doping. This characteristic difference suggests a potential experimental pathway to identify which electronic orbital plays the principal role in the formation of superconductivity in this system.
SN  - 2397-4648
ER  -