Topological spin texture of chiral edge states in photonic two-dimensional quantum walks

• URL: http://arxiv.org/abs/2112.14563v2
• Date: Mon, 25 Jul 2022 10:22:30 GMT
• Title: Topological spin texture of chiral edge states in photonic two-dimensional quantum walks
• Authors: Chao Chen, Xing Ding, Jian Qin, Jizhou Wu, Yu He, Chao-Yang Lu, Li Li, Xiong-Jun Liu, Barry C. Sanders, and Jian-Wei Pan
• Abstract summary: Topological insulators host topology-linked boundary states, whose spin and charge degrees of freedom could be exploited to design topological devices with enhanced functionality. We experimentally observe that dissipationless chiral edge states in a spin-orbit coupled anomalous Floquet topological phase exhibit topological spin texture on boundaries, realized via a two-dimensional quantum walk.
• Score: 8.662555496768842
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Topological insulators host topology-linked boundary states, whose spin and charge degrees of freedom could be exploited to design topological devices with enhanced functionality. We experimentally observe that dissipationless chiral edge states in a spin-orbit coupled anomalous Floquet topological phase exhibit topological spin texture on boundaries, realized via a two-dimensional quantum walk. Our experiment shows that, for a walker traveling around a closed loop along the boundary in real space, its spin evolves and winds through a great circle on the Bloch sphere, which implies that edge-spin texture has nontrivial winding. This winding is linked to the bulk Dirac Hamiltonian around the energy-gap opening point. Our experiment confirms that two-dimensional anomalous Floquet topological systems exhibit topological spin texture on the boundary, which could inspire novel topology-based spintronic phenomena and devices.

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