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

Autor:	Kai Cheng, Shi-Chao Fang, Zhong-Bing Huang
Rok vydání:	2022
Předmět:	Condensed Matter::Quantum Gases Computational Theory and Mathematics High Energy Physics::Lattice General Physics and Astronomy Condensed Matter::Strongly Correlated Electrons Statistical and Nonlinear Physics Mathematical Physics Computer Science Applications
Zdroj:	International Journal of Modern Physics C. 33
ISSN:	1793-6586 0129-1831
DOI:	10.1142/s0129183122501078
Popis:	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 [Formula: see text]-wave pairing correlation for repulsive on-site Hubbard interaction and [Formula: see text]-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.
Databáze:	OpenAIRE
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