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| 1 | Special Issue on “Topological photonics and beyond:novel concepts and recent advances”显示文摘The discovery of topological phases and topological insulators has revolutionized several fields of natural science,including condensed matter physics,materials science,and photonics.Topological concepts have been implemented in a variety of materials and in a broad range of wave systems ranging from electronic,atomic,photonic,plasmonic,polaritonic,to microwave,acoustic,and mechanical waves. | Zhigang Chen Hrvoje Buljan Daniel Leykam | 2020 | Light(Science & Applications)2020，9，1： | 2 |
| 2 | Intrinsic in-plane nodal chain and generalized quaternion charge protected nodal link in photonics显示文摘Nodal lines are degeneracies formed by crossing bands in three-dimensional momentum space.Interestingly,these degenerate lines can chain together via touching points and manifest as nodal chains.These nodal chains are usually embedded in two orthogonal planes and protected by the corresponding mirror symmetries.Here,we propose and demonstrate an in-plane nodal chain in photonics,where all chained nodal lines coexist in a single mirror plane instead of two orthogonal ones.Nodal lines are degeneracies formed by crossing bands in three-dimensional momentum space.Interestingly,these degenerate lines can chain together via touching points and manifest as nodal chains.These nodal chains are usually embedded in two orthogonal planes and protected by the corresponding mirror symmetries.Here,we propose and demonstrate an in-plane nodal chain in photonics,where all chained nodal lines coexist in a single mirror plane instead of two orthogonal ones.The chain point is stabilized by the intrinsic symmetry that is specific to electromagnetic waves at theГpoint of zero frequency.By adding another mirror plane,we find a nodal ring that is constructed by two higher bands and links with the in-plane nodal chain.The nodal link in momentum space exhibits non-Abelian characteristics on a C_(2)T-invariant plane,where admissible transitions of the nodal link structure are determined by generalized quaternion charges.Through near-field scanning measurements of bi-anisotropic metamaterials,we experimentally mapped out the in-plane nodal chain and nodal link in such systems.The chain point is stabilized by the intrinsic symmetry that is specific to electromagnetic waves at the r point of zero frequency.By adding another mirror plane,we find a nodal ring that is constructed by two higher bands and links with the in-plane nodal chain.The nodal link in momentum space exhibits non-Abelian characteristics on a C2T-invariant plane,where admissible transitions of the nodal link structure are determined by generalized quaternion charges.Through near-field scanning measurements of bi-anisotropic metamaterials,we experimentally mapped out the in-plane nodal chain and nodal link in such systems. | Dongyang Wang Biao Yang Qinghua Guo Ruo-Yang Zhang Lingbo Xia Xiaoqiang Su Wen-Jie Chen Jiaguang Han Shuang Zhang C.T.Chan | 2021 | Light(Science & Applications)2021，10，5： | 0 |
| 3 | Double-bowl state in photonic Dirac nodal line semimetal显示文摘The past decade has seen a proliferation of topological materials for both insulators and semimetals in electronic systems and classical waves.Topological semimetals exhibit topologically protected band degeneracies,such as nodal points and nodal lines.Dirac nodal line semimetals(DNLS),which own four-fold line degeneracy,have drawn particular attention.DNLSs have been studied in electronic systems but there is no photonic DNLS.Here in this work,we provide a new mechanism,which is unique for photonic systems to investigate a stringent photonic DNLS.When truncated,the photonic DNLS exhibits double-bowl states(DBS),which comprise two sets of perpendicularly polarized surface states.In sharp contrast to nondegenerate surface states in other photonic systems,here the two sets of surface states are almost degenerate over the whole-spectrum range.The DBS and the bulk Dirac nodal ring(DNR)dispersion along the relevant directions,are experimentally resolved. | Mengying Hu Ye Zhang Xi Jiang Tong Qiao Qiang Wang Shining Zhu Meng Xiao Hui Liu | 2021 | Light(Science & Applications)2021，10，9： | 0 |
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