Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.053902
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Funding
- Japan Society for the Promotion of Science (KAKENHI) [JP15H05735]
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We demonstrate by breaking the C-6 symmetry for higher-order at-Gamma bound states in the continuum (BICs) with topological charge -2 in photonic crystals (i) deterministic generation of off-Gamma BICs from the at-Gamma BIC and (ii) a variety of pair-creation and annihilation processes of circularly polarized states with opposite topological charges and the same handedness. To explain these phenomena, we introduce the handedness-wise topological charge quantized to a half-integer. The handedness-wise charge gives a unified picture of various phenomena involving BICs and circularly polarized states.
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