We have computed the Zak phase for a one-dimensional excitonic model, which takes into
account dimerisation, local and charge-transfer excited states. There are four hopping …

Recently topogical excitons have attracted much attention. However, studies on the
topological properties of excitons in one dimension are still rare. Here we have computed …

We study unusual gapped topological phases where they admit $\mathbb {Z} _N $ fractional
excitations in the same manner as topologically ordered phases, yet their ground state …

We investigate topological phases induced by a driven electric field coupled to a dimer
chain (a model for poly-acetylene) at high frequency regime. It is shown how the topological …

The Su-Schrieffer-Heeger (SSH) model, containing dimerized hopping and a constant onsite
energy, has become a paradigmatic model for one-dimensional topological phases, soliton …

Three-dimensional (3D) gapped topological phases with fractional excitations are divided
into two subclasses: one has topological order with point-like and loop-like excitations fully …

Exciton scattering theory attributes excited electronic states to standing waves in quasi-one-
dimensional molecular materials by assuming a quasi-particle picture of optical excitations …

The low-temperature dynamics of quantum systems are dominated by the low-energy
eigenstates. For two-dimensional systems in particular, exotic phenomena such as …

We present a two-dimensional (2D) lattice model that exhibits a nontrivial topological phase
in the absence of the Berry curvature. Instead, the Berry connection provides the topological …

We demonstrate the existence of a conceptually distinct topological pumping phenomenon
in one-dimensional chains undergoing topological adiabatic cycles. Specifically, for a stack …