Superconductivity in the extended Hubbard chain with three-electron density interaction

• Published in: Results in physics Vol. 39; p. 105670
• Main Authors: Chen, Weiting, Zhang, Jun, Ding, Hanqin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-08-2022; Elsevier
• Subjects: Phase diagram; Superconductivity; Three-particle density interaction; Weak coupling; Three-particle density interaction; Weak coupling; Phase diagram; Superconductivity
• ISSN: 2211-3797; 2211-3797
• DOI: 10.1016/j.rinp.2022.105670

At weak coupling and at half filling, we analytically study effects of an intersite three-electron density interaction (P) of the one-dimensional extended Hubbard model in addition to the usual two-electron density interactions (U,V). By the bosonization and renormalization group approaches, we obtain the ground-state phase diagram of the model. In particular, we find that even in the presence of repulsive U and V, the attractive P may give rise to the superconducting phases for 2V≤min{2|P|;4|P|−U}.
•We study the 1D extended Hubbard model with three-body interaction.•The attractive three-electron coupling leads to superconducting phases.•The study supplements understanding of quantum properties of 1D correlated systems.