论文标题
基于自旋融合模式
Resonant-amplified and invisible Bragg scattering based on spin coalescing modes
论文作者
论文摘要
与将粒子的能量水平与相反的自旋极化分开的真实磁场不同，复杂场可以导致一种特殊的光谱退化，称为特殊点（EP），其中两个自旋特征型凝结。它允许EP杂质成为带有共振旋转极化的费米的无形散射中心，但可以放大对相反极化的发射极。我们表明，一对共轭EP模式支持共振互动刺激，它基于基于阳性反馈环的基本机制充当共振器。与其他Hermitian征元一起，具有EP极化的费米恩表现出一些独家动力学，称为EP Dynamics。我们构建了几个典型的超级晶格，这些晶格是通过将EP-IMPRISTION阵列嵌入遗传学二维正方形晶格中而构建的。进行数值模拟以证明布拉格散射的共振扩增和隐形性。
Unlike a real magnetic field, which separates the energy levels of particle with opposite spin polarization, a complex field can lead to a special kind of spectral degeneracy, known as exceptional point (EP), at which two spin eigenmodes coalesce. It allows an EP impurity to be an invisible scattering center for a fermion with the resonant spin polarization, but an amplifying emitter for opposite polarization. We show that a pair of conjugate EP modes supports resonant mutual stimulation, acting as a resonant amplifier based on the underlying mechanism of positive-feedback loop. Together with other Hermitian eigenmodes, a fermion with EP polarization exhibits some exclusive dynamics, referred to as EP dynamics. We construct several typical superlattices, which are built up by embedding EP-impurity arrays in a Hermitian two-dimensional square lattice. Numerical simulations are performed to demonstrate resonant amplification and invisibility of Bragg scattering.
