Spontaneous topological diode effect induced by non-coplanar antiferromagnetic order

Nguyen Duy Khanh; Hirotaka Takagi; Rina Takagi; Susumu Minami; Tatsuto Hatanaka; Hikaru Watanabe; Michi-To Suzuki; Yuki Yanagi; Aki Kitaori; Takuya Nomoto; Ryotaro Arita; Shinichiro Seki

arXiv · 2610.37003

Spontaneous topological diode effect induced by non-coplanar antiferromagnetic order

Nguyen Duy Khanh·Hirotaka Takagi·Rina Takagi·Susumu Minami·Tatsuto Hatanaka·Hikaru Watanabe·Michi-To Suzuki·Yuki Yanagi·Aki Kitaori·Takuya Nomoto·Ryotaro Arita·Shinichiro Seki

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Abstract

In non-centrosymmetric bulk materials, electrons flowing in the opposite directions often exhibit different properties. This diode-like effect (i.e., non-reciprocal electron transport) typically originates from relativistic spin-orbit coupling, and its amplitude scales with external magnetic field or magnetization in ferromagnets. Although such rectification is usually absent in antiferromagnets at zero field, recent theories predict that non-coplanar antiferromagnetic order can host large non-reciprocity even without spin-orbit coupling, magnetization or external magnetic fields. This phenomenon - the spontaneous topological diode effect - can potentially be used for efficient electrical readout of antiferromagnetic domains, while it has not been verified for real materials. Here, we report the observation of this effect in a chiral-lattice non-coplanar antiferromagnet CoTa3S6. Nonlinear resistivity measurements reveal the non reciprocal nature of electron transport along the [001] direction at zero field. The observed non-reciprocity exceeds that in typical ferromagnets, whose amplitude is governed by antiferromagnetic order parameter rather than magnetization. First-principles calculations show that the non-coplanar antiferromagnetic order induces asymmetric band dispersions even without spin-orbit coupling, establishing the non-relativistic origin of the observed response. The present findings demonstrate a new mechanism for efficient electrical readout of antiferromagnetic domains, and highlight non-coplanar antiferromagnets as a promising material platform for realizing ferromagnet-like functional responses without relying on spin-orbit coupling or magnetization.

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Nguyen Duy Khanh, Hirotaka Takagi, Rina Takagi, Susumu Minami, Tatsuto Hatanaka, Hikaru Watanabe, Michi-To Suzuki, Yuki Yanagi, Aki Kitaori, Takuya Nomoto, Ryotaro Arita, Shinichiro Seki. 2026-10-27. Spontaneous topological diode effect induced by non-coplanar antiferromagnetic order. https://arxiv.org/abs/2610.37003

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