Spin-Orbit-Locking Chiral Bound States in the Continuum.

Zhao, Xingqi; Wang, Jiajun; Liu, Wenzhe; Che, Zhiyuan; Wang, Xinhao; Chan, C T; Shi, Lei; Zi, Jian

Zhao, Xingqi; Wang, Jiajun; Liu, Wenzhe; Che, Zhiyuan; Wang, Xinhao; Chan, C T; Shi, Lei; Zi, Jian.

Afiliación

Zhao X; State Key Laboratory of Surface Physics, Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of Physics, <a href="https://ror.org/013q1eq08">Fudan University</a>, Shanghai 200433, China.
Wang J; State Key Laboratory of Surface Physics, Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of Physics, <a href="https://ror.org/013q1eq08">Fudan University</a>, Shanghai 200433, China.
Liu W; Department of Physics, <a href="https://ror.org/00q4vv597">The Hong Kong University of Science and Technology</a>, Hong Kong 999077, China.
Che Z; Institute for Nanoelectronic devices and Quantum computing, <a href="https://ror.org/013q1eq08">Fudan University</a>, Shanghai 200438, China.
Wang X; State Key Laboratory of Surface Physics, Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of Physics, <a href="https://ror.org/013q1eq08">Fudan University</a>, Shanghai 200433, China.
Chan CT; State Key Laboratory of Surface Physics, Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of Physics, <a href="https://ror.org/013q1eq08">Fudan University</a>, Shanghai 200433, China.
Shi L; Department of Physics, <a href="https://ror.org/00q4vv597">The Hong Kong University of Science and Technology</a>, Hong Kong 999077, China.
Zi J; State Key Laboratory of Surface Physics, Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of Physics, <a href="https://ror.org/013q1eq08">Fudan University</a>, Shanghai 200433, China.

Phys Rev Lett ; 133(3): 036201, 2024 Jul 19.

Article en En | MEDLINE | ID: mdl-39094160

ABSTRACT

ABSTRACT

Bound states in the continuum (BICs), which are confined optical modes exhibiting infinite quality factors and carrying topological polarization configurations in momentum space, have recently sparked significant interest across both fundamental and applied physics. Here, we show that breaking time-reversal symmetry by an external magnetic field enables a new form of chiral BICs with spin-orbit locking. Applying a magnetic field to a magneto-optical photonic crystal slab lifts doubly degenerate BICs into a pair of chiral BICs carrying opposite pseudospins and orbital angular momenta. Multipole analysis verifies the nonzero angular momenta and reveals the spin-orbital-locking behaviors. In momentum space, we observe ultrahigh quality factors and near-circular polarization surrounding chiral BICs, enabling potential applications in spin-selective nanophotonics. Compared to conventional BICs, the magnetically induced chiral BICs revealed here exhibit distinct properties and origins, significantly advancing the topological photonics of BICs by incorporating broken time-reversal symmetry.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos

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