We propose a novel current-induced thermoelectric phenomenon, the nonlinear anomalous Ettingshausen effect (AEE), at zero magnetic field in inversion-asymmetric conductors. As an example, we discuss the weak charge ordering state in a layered organic conductor α-(BEDT-TTF)₂I₃, which is a two-dimensional massive Dirac fermion system with a pair of tilted Dirac cones. The nonlinear AEE is a thermoelectric analogue of the nonlinear anomalous Hall effect, which is recently observed in α-(BEDT-TTF)₂I₃, and these two effects generally appear simultaneously. The nonlinear AEE generates a transverse heat current, which exhibits rectifying characteristics, namely unidirectionality even under an AC current.

中文翻译：

---

有机大规模狄拉克费米子系统中可能的非线性异常热电效应

我们提出了一种新型的电流感应热电现象，即非对称非对称导体中零磁场下的非线性异常埃廷斯豪森效应（AEE）。例如，我们讨论了层状有机导体α-（BEDT-TTF）₂ I _3中的弱电荷有序状态，该导体是具有一对倾斜的狄拉克锥的二维块状狄拉克费米子系统。非线性AEE是非线性异常霍尔效应的热电类似物，最近在α-（BEDT-TTF）₂ I _3中观察到，并且这两种效果通常会同时出现。非线性AEE产生横向热电流，即使在AC电流下，它也表现出整流特性，即单向性。