Exciton Transport in the Su-Schrieffer-Heeger (SSH) Model and Molecular Aggregate Chains

The Su-Schrieffer-Heeger (SSH) model has provided the basis for studying topological effects in dimerized systems. Recently, there has been increased interest in uncovering the effects of topology in realistic systems. The Radiative Hamiltonian, a physically-motivated effective Hamiltonian that describes the interaction of a molecular aggregate with a radiation field, and includes long-range interactions as well as non-Hermitian contributions, allows for in-depth study into such systems. Using the average transfer time and steady-state current as metrics of exciton transport, we have investigated transport in a simple disordered molecular aggregate chain that displays topological properties, and made comparisons with an analytic approximation in which the system is mapped onto a pair of disordered SSH chains.