“…There has been a considerable amount of activities on single- [2-4, 8, 11, 12, 39-43] and two-component (spinor) [6,[44][45][46][47][48] slow light in atomic media induced by the EIT. The former single-complonent slow light involves a probe beam of light and one or several control beams resonantly interacting with atomic media characterized by three level Lambda (Λ) type [2,40] or four level tripod type [41,42,[49][50][51] atom-light coupling schemes.…”