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arXiv · 2502.18226

Symmetry-driven Intrinsic Nonlinear Pure Spin Hall Effect

Sayan Sarkar·Sunit Das·Amit Agarwal
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Abstract

The generation of pure spin current, spin angular momentum transport without charge flow, is crucial for developing energy-efficient spintronic devices with minimal Joule heating. Here, we introduce the intrinsic nonlinear pure spin Hall effect (NPSHE), where both linear and second-order charge Hall currents vanish. We show intrinsic second-order spin angular momentum transport in metals and insulators through a detailed analysis of the quantum geometric origin of different spin current contributions. Our comprehensive symmetry analysis identifies 39 magnetic point groups that support NPSHE, providing a foundation for material design and experimental realization. We predict significant nonlinear pure spin Hall currents in Kramers-Weyl metals even at room temperature, positioning them as potential candidates for NPSHE-based spin-torque devices. Our work lays a practical pathway for realizing charge-free angular momentum transport for the development of next-generation, energy-efficient spintronic devices.

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Sayan Sarkar, Sunit Das, Amit Agarwal. 2025-02-25. Symmetry-driven Intrinsic Nonlinear Pure Spin Hall Effect. https://doi.org/10.1103/swzr-55sp

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