1.State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China
2.Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
3.Department of Physics, University of Hong Kong, Hong Kong, China
4.Department of Electrical & Electronic Engineering, University of Hong Kong, Hong Kong, China
Yachao Liu (yachaoliu@szu.edu.cn)
Guo Ping Wang (gpwang@szu.edu.cn)
Shuang Zhang (shuzhang@hku.hk)
收稿日期:2024-05-14,
修回日期:2024-09-02,
录用日期:2024-09-10,
网络出版日期:2024-09-27,
纸质出版日期:2024-11-30
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Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium[J]. LSA, 2024,13(11):2794-2801.
Liu, Y. C. et al. Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium. Light: Science & Applications, 13, 2794-2801 (2024).
Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium[J]. LSA, 2024,13(11):2794-2801. DOI: 10.1038/s41377-024-01632-w.
Liu, Y. C. et al. Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium. Light: Science & Applications, 13, 2794-2801 (2024). DOI: 10.1038/s41377-024-01632-w.
Propagation properties of electromagnetic waves in an optical medium are mainly determined by the contour of equal-frequency states in
$$ {\boldsymbol{k}} $$
-space. In photonic Weyl media
the topological surface waves lead to a unique open arc of the equal-frequency contour
called the Fermi arc. However
for most realistic Weyl systems
the shape of Fermi arcs is fixed due to the constant impedance of the surrounding medium
making it difficult to manipulate the surface wave. Here we demonstrate that by adjusting the thickness of the air layer sandwiched between two photonic Weyl media
the shape of the Fermi arc can be continuously changed from convex to concave. Moreover
we show that the concave Fermi-arc waves can be used to achieve topologically protected electromagnetic pulling forces over a broad range of angles in the air layer. Our finding offers a generally applicable strategy to shape the Fermi arc in photonic Weyl media.
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