Single-photon scattering in a giant-molecule waveguide-QED system

We study the coherent single-photon scattering in a one-dimensional waveguide coupled to giant artificial molecule consisting of two atoms. Since each atom couples via coupling points, couplings with have three different configurations: separated-, braided-, and nested-coupling cases. obtain exact expressions transmission reflection amplitudes real-space approach. It is found that behavior spectra depends on phase shift between neighboring configuration, Concretely, we photon both Markovian non-Markovian regimes, which propagating time points neglected considered, respectively. Under limit, asymmetric Fano line shapes configurations giant-molecule waveguide-QED system can be obtained by choosing proper shift, window adjusted strength atoms these configurations. In particular, multiple peaks dips are revived regime. This paper will pave way for controllable devices based systems.