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We report on the fabrication of nano-devices on the \hkl[-1 0 1] surface of aWeyl semimetal, a macroscopic crystal of TaAs, and low-temperature transportmeasurements. We can implement electron beam lithography by peeling off andtransferring the resist for nanofabrication onto the irregular crystal. Wefabricate the device electrodes with superconducting Niobium nitride (NbN) tocontrol the current flow through the intended active area of the devices. Ourdevice structure enables the reduction of the current jetting effect, and wedemonstrate the negative magnetoresistance measurement as a function of angle.The high field magnetotransport show three distinct oscillation frequenciescorresponding to the three bands at the Fermi level. Resistance measured in thelow magnetic field shows the usual weak anti-localization dip near thezero-field -- a signature of a Weyl material. Our method of fabricating deviceswith superconducting electrodes provides a way to probe the electricalproperties of macroscopic single crystals at the nanoscale. As we useconventional lithographic techniques for patterning, this method can beextended to a wide gamut of electrode materials and a large class of 3D quantummaterials.

Nanoscale devices with superconducting electrodes to locally channel current in 3D Weyl semimetals