Topological Mixed Valence Model in Magic-Angle Twisted Bilayer Graphene

Autor:	Li, Yantao, Fregoso, Benjamin M., Dzero, Maxim
Rok vydání:	2023
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Strongly Correlated Electrons
Zdroj:	PRB 110, 045123 (2024)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.110.045123
Popis:	We develop a model to describe the mixed valence regime in magic-angle twisted bilayer graphene (MATBG) using the recently developed heavy-fermion framework. By employing the large-$N$ slave-boson approach, we derive the self-consistent mean field equations and solve them numerically. We find that the SU(8) symmetry constraint moir\'e system exhibits novel mixed-valence properties which are different from conventional heavy-fermions systems. We find the solutions describing the physics at the filling near the Mott insulator regime in the limit of strong Coulomb interactions between the flat-band fermions. Our model can provide additional insight into the possible microscopic origin of unconventional superconductivity in MATBG. Comment: 4+9 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2309.03416 Zobrazit plný text záznamu View this record from Arxiv