Topologically Protected Exceptional Points and Reentrant 𝒫𝒯 Phase in an Exact Ternary Model
Physical Review A(2023)
摘要
In open, driven systems where parity-time symmetry is preserved, phenomena
that defy conventional wisdom emerge near exceptional points, promising
advances in photonics. While most studies focus on two-level systems of a
conventional exceptional point, unconventional exceptional points as well as
reentrant phases have been discovered in separate studies of higher-dimensional
phase spaces. In this Letter, we present a minimal, analytical model that
encompasses several key phenomena in higher-dimensional phase spaces, including
reentrant PT phases, higher-order exceptional points, and anisotropic
exceptional points. Using the exact analytical solution, we identify a new
topological index as the unifying origin of these different phenomena. The
simplicity of the model may furthermore facilitate experimental implementations
for enhanced sensing and efficient polariton devices.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要