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Surface Fermi arcs (SFAs), the unique open Fermi-surfaces (FSs) discoveredrecently in topological Weyl semimetals (TWSs), are unlike closed FSs inconventional materials and can give rise to many exotic phenomena, such asanomalous SFA-mediated quantum oscillations, chiral magnetic effects,three-dimensional quantum Hall effect, non-local voltage generation andanomalous electromagnetic wave transmission. Here, by using in-situ surfacedecoration, we demonstrate successful manipulation of the shape, size and eventhe connections of SFAs in a model TWS, NbAs, and observe their evolution thatleads to an unusual topological Lifshitz transition not caused by the change ofthe carrier concentration. The phase transition teleports the SFAs betweendifferent parts of the surface Brillouin zone. Despite the dramatic surfaceevolution, the existence of SFAs is robust and each SFA remains tied to a pairof Weyl points of opposite chirality, as dictated by the bulk topology.

Topological Lifshitz Transitions and Fermi Arc Manipulation in Weyl Semimetal NbAs