1 code implementation • 25 Aug 2019 • Zhao-Long Gu, Zhao-Yang Dong, Shun-Li Yu, Jian-Xin Li
We find an exact set of bases for magnons in the flatband limit constructed from sublattice particle-hole vectors and derive an effective model to explore the origin of the topological magnon which is attributed to the ``mass inversion mechanism''.
Strongly Correlated Electrons
2 code implementations • 29 Oct 2018 • Xiao-Fei Su, Zhao-Long Gu, Zhao-Yang Dong, Shun-Li Yu, Jian-Xin Li
By using the numerical exact diagonalization method with a projection onto the nearly-flat band, we obtain the ferromagnetic spin-1 excitation spectra for both the Chern and $Z_2$ Hubbard models, consisting of spin waves and Stoner continuum.
Strongly Correlated Electrons
2 code implementations • 16 Jan 2018 • Xiao-Fei Su, Zhao-Long Gu, Zhao-Yang Dong, Jian-Xin Li
Different from previous scenarios that topological magnons emerge in local spin models, we propose an alternative that itinerant electron magnets can host topological magnons.
Strongly Correlated Electrons
no code implementations • 16 Dec 2015 • Zhao-Long Gu, Kai Li, Jian-Xin Li
We detect the topological properties of Chern insulators with strong Coulomb interactions by use of cluster perturbation theory and variational cluster approach.
Strongly Correlated Electrons
