Bound states and chiral excitation in the effective Floquet continuum within tilted waveguide lattices

作者：Tianze Sheng, Lifeng Liu, Zhang Ying, Jun Qian, Xiaolin Li, Yueping Niu, Shangqing Gong · 发表于：Physical Review A · 年份：2025 · DOI：10.1103/physreva.111.063505 · 研究领域：Topological Materials and Phenomena、Nonlinear Photonic Systems、Cold Atom Physics and Bose-Einstein Condensates

We investigate the dynamics of light escaping from a tilted waveguide capable of supporting chiral light excitation into a two-band Su-Schrieffer-Heeger system functioning as a continuum. In a periodic scenario that gives rise to Floquet multibands, our research reveals that the effective bands, exhibiting time-reversal symmetry breaking, host bound states in the continuum (BICs) generated through coupling interference, alongside phenomena reminiscent of spontaneous radiation. Moreover, we analyze the influence of the zero mode on the BICs and the chiral transport of the excited Bloch waves within the tilt-induced Floquet bands. Our results establish a foundational pathway for exploring BICs in systems exhibiting time-reversal symmetry breaking.