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Three-dimensional Dirac semimetals, a three-dimensional analogue of graphene,are unusual quantum materials with massless Dirac fermions, which can befurther converted to Weyl fermions by breaking time reversal or inversionsymmetry. Topological surface states with Fermi arcs are predicted on thesurface and have been observed by angle-resolved photoemission spectroscopyexperiments. Although the exotic transport properties of the bulk Dirac coneshave been demonstrated, it is still a challenge to reveal the surface statesvia transport measurements due to the highly conductive bulk states. Here, weshow Aharonov-Bohm oscillations in individual single-crystal Cd3As2 nanowireswith low carrier concentration and large surface-to-volume ratio, providingtransport evidence of the surface state in three-dimensional Dirac semimetals.Moreover, the quantum transport can be modulated by tuning the Fermi levelusing a gate voltage, enabling a deeper understanding of rich physics residingin Dirac semimetals.

Aharonov-Bohm oscillations in Dirac semimetal Cd3As2 nanowires