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Dirac materials, which feature Dirac cones in the reciprocal space, have beenone of the hottest topics in condensed matter physics in the past decade. Todate, 2D and 3D Dirac Fermions have been extensively studied, while their 1Dcounterparts are rare. Recently, Si nanoribbons (SiNRs), which are composed ofalternating pentagonal Si rings, have attracted intensive attention. However,the electronic structure and topological properties of SiNRs are still elusive.Here, by angle-resolved photoemission spectroscopy, scanning tunnelingmicroscopy/spectroscopy measurements, first-principles calculations, andtight-binding model analysis, we demonstrate the existence of 1D Dirac Fermionsin SiNRs. Our theoretical analysis shows that the Dirac cones derive from thearmchairlike Si chain in the center of the nanoribbon and can be described bythe Su-Schrieffer-Heeger model. These results establish SiNRs as a platform forstudying the novel physical properties in 1D Dirac materials.

Observation of one-dimensional Dirac fermions in silicon nanoribbons