Topology and Localizations in a 2D Su-Schrieffer-Heeger Model with Domain Walls, Quasi-periodic Disorder and Periodic Hopping Modulations

Abstract

We study a two dimensional (2D) Su-Schrieffer-Heeger (SSH) model on a square lattice in presence of domain walls (DW) / vortices or quasi-periodic disorders to investigate the nature of topology and localizations in its quantum states. While in a pure 2D SSH model, zero energy states (ZES) lie within the dispersion continuum and the bound states in continuum (BIC) are localized at the corners, a continuous distributions of DWs can produce localized ZES along the DW lines or at the DW center depending on the orientations of the DWs. Moreover with such DWs, one can witness nonzero energy in-gap states showing localizations at the edges, along the DWs or at the DW center. For probing disorder effect, we introduce on-site quasiperiodic potentials (QP) in such systems that show the usual tendency of the states to localize. But exotic reentrant localization behavior is also captured for judicious choice of the QP term. We also examine the scenario for different hopping periodicities in the SSH Hamiltonian. Interestingly for anisotropic hopping modulations, the bulk ZES gets exhausted leaving only topological boundary modes at zero energies. The fate of these states in presence of the DWs are also discussed. Our present study with its plethora of exotic outcomes can thus inspire varied applications in the field of topological quantum computations.