Anomalous skew-scattering nonlinear hall effect and chiral photocurrents in PT-symmetric antiferromagnets

Anomalous skew-scattering nonlinear hall effect and chiral photocurrents in PT-symmetric antiferromagnets

Berry curvature and skew scattering play central roles in determining both the linear and nonlinear anomalous Hall effects. Yet in PT-symmetric antiferromagnetic metals, Hall effects from either intrinsic Berry curvature mediated anomalous velocity or the conventional skew-scattering process individ...

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Bibliographic Details
Main Authors: Ma, Da, Arora, Arpit, Vignale, Giovanni, Song, Justin Chien Wen
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2023
Subjects:
Science::Physics
Anomalous Hall Effects
Antiferromagnetic Orderings
Online Access:https://hdl.handle.net/10356/171433
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Institution: Nanyang Technological University
Language: English
Description
Summary:Berry curvature and skew scattering play central roles in determining both the linear and nonlinear anomalous Hall effects. Yet in PT-symmetric antiferromagnetic metals, Hall effects from either intrinsic Berry curvature mediated anomalous velocity or the conventional skew-scattering process individually vanish. Here we reveal an unexpected nonlinear Hall effect that relies on both Berry curvature and skew-scattering working in cooperation. This anomalous skew-scattering nonlinear Hall effect (ASN) is PT even and dominates the low-frequency nonlinear Hall effect for PT-symmetric antiferromagnetic metals. Surprisingly, we find that in addition to its Hall response, ASN produces helicity dependent photocurrents, in contrast to other known PT-even nonlinearities in metals that are helicity blind. This characteristic enables us to isolate ASN and establishes new photocurrent tools to interrogate the antiferromagnetic order of PT-symmetric metals.

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