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Quantum spin Hall insulators have one-dimensional (1D) spin-momentum lockedtopological edge states (ES) inside the bulk band gap, which can serve asdissipationless channels for the practical applications in low consumptionelectronics and high performance spintronics. However, the clean and atomicallysharp ES serving as ideal 1D conducting channels are still lack. Here, wereport the formation of the quasi-1D Bi4I4 nanoribbons on the surface ofBi(111) with the support of the graphene-terminated 6H-SiC(0001) and the directobservations of the topological ES at the step edge by scanning tunnelingmicroscopy and spectroscopic-imaging results. The ES reside surround the edgeof Bi4I4 nanoribbons and exhibits remarkable robustness against non timereversal symmetry perturbations. The theoretical simulations verify thetopological non-trivial character of 1D ES, which is retained after consideringthe presence of the underlying Bi(111). Our study supports the existence oftopological ES in Bi4I4 nanoribbons, paving the way to engineer the noveltopological features by using the nanoribbons as the 1D building block.

Epitaxial Growth of Quasi-One-Dimensional Bismuth-Halide Chains with Topological Non-Trivial Edge States