Realization of edge states along a synthetic orbital angular momentum dimension

• URL: http://arxiv.org/abs/2311.17588v1
• Date: Wed, 29 Nov 2023 12:31:23 GMT
• Title: Realization of edge states along a synthetic orbital angular momentum dimension
• Authors: Yu-Wei Liao, Mu Yang, Hao-Qing Zhang, Zhi-He Hao, Jun Hu, Tian-Xiang Zhu, Zong-Quan Zhou, Xi-Wang Luo, Jin-Shi Xu, Chuan-Feng Li, and Guang-Can Guo
• Abstract summary: Photonic orbital angular momentum serves as a suitable synthetic dimension. We make a sharp boundary along a synthetic OAM dimension and form approximate semi-infinite lattices by drilling a pinhole on the optical elements in a cavity. Our work provides a new perspective to observe edge effects and explore practical photonics tools.
• Score: 3.917553936993137
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The synthetic dimension is a rising method to study topological physics, which enables us to implement high-dimensional physics in low-dimensional geometries. Photonic orbital angular momentum (OAM), a degree of freedom characterized by discrete yet unbounded, serves as a suitable synthetic dimension. However, a sharp boundary along a synthetic OAM dimension has not been demonstrated, dramatically limiting the investigation of topological edge effects in an open boundary lattice system. In this work, we make a sharp boundary along a Floquet Su-Schrieffer-Heeger OAM lattice and form approximate semi-infinite lattices by drilling a pinhole on the optical elements in a cavity. The band structures with zero ($\pm\pi$) energy boundary states are measured directly, benefiting from the spectra detection of the cavity. Moreover, we obtain the edge modes moving from the gap to the bulk by dynamically changing the boundary phase, and we reveal that interference near the surface leads to spectrum discretization. Our work provides a new perspective to observe edge effects and explore practical photonics tools.

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