  We study the dissipative dynamics of an atom in a V-level configuration
driven by lasers and coupled to a semi-infinite waveguide. The coupling to the
waveguide is chiral, in that each transition interacts only with the modes
propagating in a given direction, and this direction is opposite for the two
transitions. The waveguide is terminated by a mirror which coherently feeds the
photon stream emitted by one transition back to the atom. First, we are
interested in the dynamics of the atom in the Markovian limit where the
time-delay in the feedback is negligible. Specifically, we study the conditions
under which the atom evolves towards a pure "dark" stationary state, where the
photons emitted by both transitions interfere destructively thanks to the
coherent feedback, and the overall emission vanishes. This is a single-atom
analog of the quantum dimer, where a pair of laser-driven two-level atoms is
coupled to a unidirectional waveguide and dissipates towards a pure entangled
dark state. Our setup should be feasible with current state-of-the-art
experiments. Second, we extend our study to non-Markovian regimes and
investigate the effect of the feedback retardation on the steady-state.
