Interaction-driven topological insulators on the kagome and the decorated honeycomb lattices
By J. Wen, A. Ruegg, C.C.-Joseph Wang, G. Fiete. 2010
132 citations recorded by the source corpus.
We study the spinless and spinful extended Hubbard models with repulsive interactions on the kagome and the decorated honeycomb (star) lattice. Using Hartree-Fock mean-field theory, we show that interaction-driven insulating phases with nontrivial topological invariants (Chern number or ${Z}_{2}$ invariant) exist for an experimentally reasonable range of parameters. These phases occur at filling fractions which involve either Dirac points or quadratic band crossing points in the noninteracting limit. We present comprehensive mean-field phase diagrams for these lattices and discuss the competition between topologically nontrivial phases and numerous other ordered states, including various charge, spin, and bond orderings. Our results suggest that ${Z}_{2}$ topological insulators should be found in a number of systems with either little or no intrinsic spin-orbit coupling.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/f0e51d4b206869817f114c5bc5bc6b69b8bfce5e
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Superconductivity in the Z2 kagome metal KV3Sb5 (2020, background): “In the localized electron limit, superconductivity competes with a variety of other electronic instabilities at different fillings [16, 17].”
- Quantum states and intertwining phases in kagome materials (2023, background): “For example, a 2 Z topological insulating state can exist in the kagome system even with negligible intrinsic SOC 53 .”