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EuCd2As2 was theoretically predicted to be a minimal model of Weyl semimetalswith a single pair of Weyl points in the ferromagnet state. However, theheavily p-doped EuCd2As2 crystals in previous experiments prevent directidentification of the semimetal hypothesis. Here we present a comprehensivemagneto-transport study of high-quality EuCd2As2 crystals with ultralow bulkcarrier density (10^13 cm-3). In contrast to the general expectation of a Weylsemimetal phase, EuCd2As2 shows insulating behavior in both antiferromagneticand ferromagnetic states as well as surface-dominated conduction from bandbending. Moreover, the application of a dc bias current can dramaticallymodulate the resistance by over one order of magnitude, and induce a periodicresistance oscillation due to the geometric resonance. Such nonlinear transportresults from the highly nonequilibrium state induced by electrical field nearthe band edge. Our results suggest an insulating phase in EuCd2As2 and put astrong constraint on the underlying mechanism of anomalous transport propertiesin this system.

Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd2As2