The nonlinear Hall effect (NLHE) reflects Berry-curvature-related properties in non-centrosymmetric but time-reversal-symmetric materials. So far, the NLHE of the investigated systems remains a tiny effect due to the lack of Weyl point as magnetic monopoles in 2D systems or to the high carrier concentration in 3D systems. Here, we report large NLHE due to gigantic Berry curvature dipole density as generated by tilted Weyl cones near the Fermi level in a model ferroelectric Weyl semimetal In-doped Pb_1−xSn_xTe. By systematically lowering the carrier concentration down to ~10¹⁶ cm⁻³, the Berry curvature dipole density reaches values around 10⁻²¹ m³, 10²–10⁷ times higher than the previously reported ones. Furthermore, NLHE exhibits a power law of carrier concentration and follows the k⁻² relation of the Berry curvature expression derived from the monopole. The present study establishes giant NLHE in a ferroelectric Weyl semimetal, promising for future applications such as current rectification.

非线性霍尔效应 (NLHE) 反映了非中心对称但时间反演对称材料中与贝里曲率相关的特性。到目前为止，由于缺乏 Weyl 点作为 2D 系统中的磁单极子或 3D 系统中的高载流子浓度，所研究系统的 NLHE 的影响仍然很小。_{在这里，我们报告了由于在模型铁电外尔半金属 In 掺杂 Pb 1 -x} Sn _x Te中由靠近费米能级的倾斜外尔锥产生的巨大贝里曲率偶极子密度而产生的大 NLHE 。通过系统地将载流子浓度降低至~10 ¹⁶ cm ^-3，贝里曲率偶极子密度达到约10 ^-21 m ³ , 10 ^2的值–10比先前报告的高出^7倍。此外，NLHE 表现出载流子浓度的幂律，并遵循从单极子导出的贝里曲率表达式的k ^-2关系。本研究在铁电外尔半金属中建立了巨大的 NLHE，有望用于电流整流等未来应用。