Entanglement in a second-order topological insulator on a square lattice
Entanglement in a second-order topological insulator on a square lattice
In a $d$-dimensional topological insulator of order $d$, there are zero energy states on its corners which have close relationship with its entanglement behaviors. We studied the bipartite entanglement spectra for different subsystem shapes and found that only when the entanglement boundary has corners matching the lattice, exact zero modes …