束缚态
物理
球体
引力奇点
消灭
上下界
拓扑(电路)
电介质
联轴节(管道)
量子力学
材料科学
数学分析
数学
天文
组合数学
冶金
作者
Evgeny N. Bulgakov,Дмитрий Н. Максимов
标识
DOI:10.1103/physrevlett.118.267401
摘要
We consider Bloch bound states in the radiation continuum in periodic arrays of dielectric spheres. It is demonstrated that the bound states are associated with phase singularities of the quasimode coupling strength. That makes the bound states topologically protected and, therefore, robust against any variation of parameters preserving the periodicity and rotational symmetry about the array axis. It is shown that under variation of parameters the bound states can only be destroyed by either annihilation of the topological charge or by migration to the sector of the parametric space where the second radiation channel is open.
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