Details

Autor(en) / Beteiligte

• Liu, Xiuying
• Xia, Shiqi
• Jajtić, Ema
• Song, Daohong
• Li, Denghui
• Tang, Liqin
• Leykam, Daniel
• Xu, Jingjun
• Buljan, Hrvoje
• Chen, Zhigang

Titel

Universal momentum-to-real-space mapping of topological singularities

Ist Teil von

• Nature communications, 2020-03, Vol.11 (1), p.1586-1586, Article 1586

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Topological properties of materials are typically presented in momentum space. Here, we demonstrate a universal mapping of topological singularities from momentum to real space. By exciting Dirac-like cones in photonic honeycomb (pseudospin-1/2) and Lieb (pseudospin-1) lattices with vortex beams of topological charge l, optimally aligned with a given pseudospin state s, we directly observe topological charge conversion that follows the rule l → l + 2s. Although the mapping is observed in photonic lattices where pseudospin-orbit interaction takes place, we generalize the theory to show it is the nontrivial Berry phase winding that accounts for the conversion which persists even in systems where angular momentum is not conserved, unveiling its topological origin. Our results have direct impact on other branches of physics and material sciences beyond the 2D photonic platform: equivalent mapping occurs for 3D topological singularities such as Dirac-Weyl synthetic monopoles, achievable in mechanical, acoustic, or ultracold atomic systems, and even with electron beams.