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Weyl semimetals constitute a newly discovered class of three-dimensionaltopological materials with linear touchings of valence and conduction bands inthe bulk. The most striking property of topological origin in these materials,so far unequivocally observed only in photoemission experiments, is thepresence of open constant-energy contours at the boundary --- the so-calledFermi arcs. In this work, we establish the universal characteristics ofFermi-arc contributions to surface quasiparticle interference. Using a generalphenomenological model, we determine the defining interference patternsstemming from the existence of Fermi arcs in a surface band structure. We thentrace these patterns in both simple tight-binding models and realistic abinitio calculations. Our results show that definitive signatures of Fermi arcscan be observed in existing and proposed Weyl semimetals using scanningtunneling spectroscopy.

Universal signatures of Fermi arcs in quasiparticle interference on the surface of Weyl semimetals