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A signature property of Weyl semimetals is the existence of topologicallyprotected surface states - arcs in momentum space that connect Weyl points inthe bulk. However, the presence of bulks states makes detection of surfacecontributions to the transport challenging. Here we present a magnetoresistancestudy of high-quality samples of the prototypical Weyl semimetal, TaAs. Bymeasuring the Shubnikov de Haas effect, we reveal the presence of atwo-dimensional cyclotron orbit. This orbit is quantitatively consistent withthe interference of coherent quasiparticles traversing two distinct Fermi arcson the [001] crystallographic surface. The observation of this effect suggeststhat high magnetic fields can be used to study not only the transportproperties of Fermi arcs, but also the interference of their quantum mechanicalwavefunctions.

Transport signatures of surface states in a Weyl semimetal: evidence of field driven Fermi arc interferometry