Zhou, L , Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China
部门归属:
[Zhou, L; Lu, J] Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China; [Zhou, L; Sun, CP] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; [Zhou, DL] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
英文摘要:
Polaritons are the collective excitations of many atoms dressed by resonant photons, which can be used to explain the slow light propagation with the mechanism of electromagnetically induced transparency. As quasiparticles, these collective excitations possess the typical feature of the matter particles, which can be reflected and deflected by the inhomogeneous medium in its spatial motion with some velocity. In this paper we develop a quantum theory to systematically describe the spatial motion of polaritons in inhomogeneous magnetic and optical fields. This theoretical approach treats these quasiparticles through an effective Schrodinger equation with anisotropic dispersion that the longitudinal motion is similar to an ultrarelativistic motion of a "slow light velocity" while the transverse motion is of nonrelativity with certain effective mass. We find that, after passing through the EIT medium, the light ray bends due to the spatial-dependent profile of external field. This phenomenon explicitly demonstrates the exotic corpuscular and anisotropic property of polaritons.
