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Enhancement of pairing correlations due to nearly flat bands in the plaquette-Lieb Hubbard model

Author

Listed:
  • Kai Cheng

    (Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, P. R. China)

  • Shi-Chao Fang

    (Department of Physics, Nanyang Institute of Technology, Nanyang 473004, P. R. China)

  • Zhong-Bing Huang

    (Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, P. R. China)

Abstract

Motivated by recent research works on the flat-band correlated electron systems, we construct a plaquette-Lieb lattice, which exhibits nearly flat bands close to the Fermi level around half-filling, when the inter-plaquette hopping integral is much smaller than the intra-plaquette one. A detailed comparison study with the well-known checkerboard lattice indicates that there exist significant differences for the pairing property between the two lattices, and the nearly flat bands on the plaquette-Lieb lattice strongly enhance the d-wave pairing correlation for repulsive on-site Hubbard interaction and s-wave pairing correlation for attractive on-site Hubbard interaction. Our study not only provides a new lattice with nearly flat bands, but also deepens the understanding of electronic structure on superconductivity.

Suggested Citation

  • Kai Cheng & Shi-Chao Fang & Zhong-Bing Huang, 2022. "Enhancement of pairing correlations due to nearly flat bands in the plaquette-Lieb Hubbard model," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 33(08), pages 1-11, August.
    • Handle: RePEc:wsi:ijmpcx:v:33:y:2022:i:08:n:s0129183122501078
    DOI: 10.1142/S0129183122501078
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