光子晶体中巨Lamb移位

Giant Lamb shift in photonic crystals

对非均匀电磁系统中原子的Lamb移位导出一个普适的理论公式 ,发现对Lamb移位的主要贡献来自实光子的吸收和再辐射过程 ,这打破了自 194 7年以来一直被人们所认同的传统概念 ,即在均匀空间中 ,Lamb移位主要来自虚光子的吸收和再辐射过程 .对光子晶体 ,文章作者预言了巨Lamb移位效应 .对原子集合 ,进一步发现依赖位置的Lamb移位将使一个能级扩展成一个能带 。

We obtain a general result for the Lamb shift of excited states of multi-level atoms in inhomogeneous electromagnetic structures and find that the Lamb shift comes from real photon processes, in contrast to the conventional concept established in 1947 that, in the case of free space, the virtual photon processes play a key role. We find that photonic crystals can lead to a giant Lamb shift. We also predict that the position-dependent Lamb shift should extend from a single level to a mini-band for an assembly of atoms with random distributions in space, similar to the velocity-dependent Doppler effect in atomic/molecular gases.