Valley photonic crystals for control of spin and topology.

  title={Valley photonic crystals for control of spin and topology.},
  author={Jianwen Dong and Xiaodong Chen and Hanyu Zhu and Yuan Wang and Xiang Zhang},
  journal={Nature materials},
  volume={16 3},
Photonic crystals offer unprecedented opportunity for light manipulation and applications in optical communication and sensing. Exploration of topology in photonic crystals and metamaterials with non-zero gauge field has inspired a number of intriguing optical phenomena such as one-way transport and Weyl points. Recently, a new degree of freedom, valley, has been demonstrated in two-dimensional materials. Here, we propose a concept of valley photonic crystals with electromagnetic duality… 
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