One-dimensional spin-flipping topological edge state laser

TL;DR

This paper demonstrates the experimental control and lasing of one-dimensional topological edge states through boundary condition manipulation, revealing spin-flipping back-scattering and a novel traveling resonance with potential for spin-based light applications.

Contribution

It introduces a method to manipulate spin states of topological edge modes via boundary conditions and demonstrates lasing of the resulting traveling resonance.

Findings

Spin-flipping back-scattering induced by boundary conditions.

Observation of lasing in one-dimensional traveling resonance.

Potential for practical spin manipulation in photonic systems.

Abstract

Topological edge states manifest spin-momentum-locking propagation as a primary consequence of topological crystals. However, experimental studies on spin manipulation and the resulting propagation of these states are lacking. Here, we demonstrate experimentally spin manipulation of topological edge states by the boundary conditions of the one-dimensional path. Armchair boundaries at the endpoints of the path induce spin-flipping back-scattering, resulting in a novel one-dimensional resonance -- traveling resonance. Remarkably, we demonstrate lasing of this one-dimensional traveling resonance. Our findings hold significant potential for practical applications in spin manipulation of light.