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Berry curvature and skew-scattering play central roles in determining boththe linear and nonlinear anomalous Hall effects. Yet in {\it PT}-symmetricantiferromagnetic metals, Hall effects from either intrinsic Berry curvaturemediated anomalous velocity or the conventional skew-scattering processindividually vanish. Here we reveal an unexpected nonlinear Hall effect thatrelies on both Berry curvature and skew-scattering working in cooperation. Thisanomalous skew-scattering nonlinear Hall effect (ASN) is {\it PT}-even anddominates the low-frequency nonlinear Hall effect for {\it PT}-symmetricantiferromagnetic metals. Surprisingly, we find that in addition to its Hallresponse, ASN produces helicity dependent photocurrents, in contrast to otherknown {\it PT}-even nonlinearities in metals which are helicity blind. Thischaracteristic enables to isolate ASN and establishes new photocurrent tools tointerrogate the antiferromagnetic order of {\it PT}-symmetric metals.

Anomalous skew-scattering nonlinear Hall effect and chiral photocurrents in {\it PT}-symmetric antiferromagnets