Fermionic Symmetry-Protected Topological Phase in a Two-Dimensional Hubbard Model
Fermionic Symmetry-Protected Topological Phase in a Two-Dimensional Hubbard Model
We study the two-dimensional (2D) Hubbard model using exact diagonalization for spin-1/2 fermions on the triangular and honeycomb lattices decorated with a single hexagon per site. In certain parameter ranges, the Hubbard model maps to a quantum compass model on those lattices. On the triangular lattice, the compass model exhibits …