论文标题
在被动系统中非富特效应的可观察性的基本限制
Fundamental constraints on the observability of non-Hermitian effects in passive systems
论文作者
论文摘要
利用散射理论，我们量化了物理约束的后果，这些物理约束限制了被动装置中非富甲效应的可见性。限制是源于系统遵守因果关系的基本要求，并且可以根据内部时间延迟操作员进行简洁的捕获，此外，该操作员还可以直接定量衡量国家密度中特定非炎症现象的可见性。我们通过对比不同的对称类别和非热效应来说明了含义，包括特殊点和非铁皮皮肤效应，其潜在的极端模式非正交性被证明是有效地掩盖的。
Utilizing scattering theory, we quantify the consequences of physical constraints that limit the visibility of non-Hermitian effects in passive devices. The constraints arise from the fundamental requirement that the system obeys causality, and can be captured concisely in terms of an internal time-delay operator, which furthermore provides a direct quantitative measure of the visibility of specific non-Hermitian phenomena in the density of states. We illustrate the implications by contrasting different symmetry classes and non-Hermitian effects, including exceptional points and the non-Hermitian skin effect, whose underlying extreme mode nonorthogonality turns out to be effectively disguised.
