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arXiv · 2412.02937

Orbital anomalous Hall effect in the few-layer Weyl semimetal TaIrTe4

An-Qi Wang·Dong Li·Tong-Yang Zhao·Xing-Yu Liu·Jiantian Zhang·Xin Liao·Qing Yin·Zhen-Cun Pan·Peng Yu·Zhi-Min Liao
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Abstract

We report on the observation of the linear anomalous Hall effect (AHE) in the nonmagnetic Weyl semimetal TaIrTe4. This is achieved by applying a direct current Idc and an alternating current Iac (Iac<<Idc) in TaIrTe4, where the former induces time-reversal symmetry breaking and the latter probes the triggered AHE. The anomalous Hall resistance VacH/Iac shows a linear dependence on Idc and changes sign with the polarity of Idc. In temperature-dependent measurements, VacH/Iac also experiences a sign reversal at 100 K, consistent with the temperature-dependent nonlinear Hall effect (NLHE). Furthermore, in measurements involving only dc transport, the dc Hall voltage exhibits a quadratic relationship with Idc. When the Idc direction is reversed, the Hall resistance changes sign, demonstrating a colossal nonreciprocal Hall effect (NRHE). Our theoretical calculations suggest that the observed linear AHE, NLHE, and NRHE all dominantly originate from the current-induced orbital magnetization compared to the minor spin contribution. This work provides deep insights into the orbital magnetoelectric effect and nonlinear Hall response, promising precise electric control of out-of-plane polarized orbit flow.

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An-Qi Wang, Dong Li, Tong-Yang Zhao, Xing-Yu Liu, Jiantian Zhang, Xin Liao, Qing Yin, Zhen-Cun Pan, Peng Yu, Zhi-Min Liao. 2024-12-04. Orbital anomalous Hall effect in the few-layer Weyl semimetal TaIrTe4. https://doi.org/10.1103/physrevb.110.155434

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