Edge States and Topological Phases in One-Dimensional Optical Superlattices
Edge States and Topological Phases in One-Dimensional Optical Superlattices
We show that one-dimensional quasi-periodic optical lattice systems can exhibit edge states and topological phases which are generally believed to appear in two-dimensional systems. When the Fermi energy lies in gaps, the Fermi system on the optical superlattice is a topological insulator characterized by a nonzero topological invariant. The topological …