Cavity-controlled exciton transport of the Su-Schrieffer-Heeger chain

Abstract

Understanding and manipulating the excitation transport lie in the center of the research of various mesoscopic quantum devices. Here, we study the exciton transport in a one-dimensional two-level systems chain described by the Su-Schrieffer-Heeger Hamiltonian. Without cavity, the dimerization-assisted transport occurs for both odd and even chains. It is proved that such an effect is the result of competition between localization and delocalization of the modes near zero energy. In the presence of a cavity, both the localized edge modes of the even chain can be dressed by the cavity by the loss of their parities induced by the driving field. The exciton transport can be significantly enhanced through the polaritonic states formed by the strong coupling of edge states and the cavity. The polaritonic channels originating from edge modes with different parities compete with each other and can each dominate the transport at different exciton-cavity coupling strengths. Our work provides possible avenues for the enhancement and control of exciton transport for excitonic devices.