Abstract
Unconventional ferromagnetism and superconductivity in the imbalanced kagome-lattice Hubbard model are investigated by the mean-field theory and determinant quantum Monte Carlo method. Due to the asymmetric band structure of kagome lattice, the spin- ferromagnetic order intrinsically exists in the system, which is first enhanced by the interaction, and then continuously destructed after reaching a maximum at a moderate interaction strength. In contrast, the -plane ferromagnetism develops only above a critical interaction, which is estimated to be by finite-size scaling. We further verify the nature of the above transverse magnetic transition, and demonstrate it belongs to the three-dimensional universality class. Finally, we study the superconducting property, and reveal the possible superconducting state has a triplet -wave pairing symmetry. Our results uncover the exotic quantum states induced by the interactions on kagome lattice, and provide important insights regarding the interplay between electronic correlations and geometry frustrations.
7 More- Received 9 April 2022
- Accepted 14 June 2022
DOI:https://doi.org/10.1103/PhysRevB.105.245131
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