Université Grenoble Alpes, CNRS, LPMMC, 38000 Grenoble, France.
Phys Rev Lett. 2018 Aug 31;121(9):093601. doi: 10.1103/PhysRevLett.121.093601.
We establish a localization phase diagram for light in a random three-dimensional (3D) ensemble of motionless two-level atoms with a threefold degenerate upper level, in a strong static magnetic field. Localized modes appear in a narrow spectral band when the number density of atoms ρ exceeds a critical value ρ_{c}≃0.1k_{0}^{3}, where k_{0} is the wave number of light in the free space. A critical exponent of the localization transition taking place upon varying the frequency of light at a constant ρ>ρ_{c} is estimated to be ν=1.57±0.07. This classifies the transition as an Anderson localization transition of 3D orthogonal universality class.
我们在强静态磁场中建立了一个由静止的三能级原子组成的随机三维（3D）体系中光的局域相图，其中上能级三重简并。当原子数密度 ρ 超过临界值 ρ_{c}≃0.1k_{0}^{3}时，在一个狭窄的光谱带中会出现局域模式，其中 k_{0}是自由空间中光的波数。在 ρ>ρ_{c}时，通过固定 ρ 改变光的频率发生局域化跃迁的临界指数被估计为 ν=1.57±0.07。这将跃迁归类为三维正交普遍类的安德森局域化跃迁。
