A giant atom with modulated transition frequency

Giant atoms are known for the frequency-dependent spontaneous emission and associated interference effects. In this paper, we study dynamics of a two-level giant atom with dynamically modulated transition frequency. It is shown that retarded feedback effect giant-atom system greatly modified by dynamical phase arising from frequency modulation retardation itself. Interestingly, such modification can in turn suppress behaves like small one. By introducing an additional difference between two atom-waveguide coupling paths, also demonstrate possibility realizing chiral tunable temporal profiles output fields. The results paper have potential applications quantum information processing network engineering.