| Summary: | A chiral-coupled atomic chain of two-level quantum emitters allows strong resonant dipole-dipole interactions, which enables significant collective couplings between every other emitter. We numerically obtain the steady-state phase diagram of such a system under weak excitations, where interaction-driven states of crystalline orders, edge or hole excitations, and a dichotomy of chiral flow are identified. We distinguish these phases and regions by participation ratios and structure factors, and find two critical points which relate to decoherence-free subradiant sectors of the system. We further investigate the transport of excitations and the emergence of crystalline orders under spatially varying excitation detunings, and present nonergodic butterflylike system dynamics in the phase of extended hole excitations with a signature of persistent subharmonic oscillations. Our results demonstrate the interaction-induced quantum phases of matter with chiral couplings, and pave the way toward simulations of many-body states in nonreciprocal quantum optical systems.
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