长寿命能谷极化弛豫子产生的非线性霍尔效应
Nonlinear Hall effect from long-lived valley-polarizing relaxons
AI总结：
该研究通过从头算玻尔兹曼输运方程，发现p型掺杂GeTe中60%增强且具频率依赖性的非线性霍尔效应源于电子-声子散射产生的长寿命能谷极化，挑战了传统贝里曲率偶极子解释，有待实验验证。
摘要：
非线性霍尔效应因动量空间中贝里曲率偶极子这一著名且被广泛采用的解释而备受关注。我们利用从头算玻尔兹曼输运方程发现，p型掺杂GeTe的非线性霍尔效应增强了60%，且具有显著的频率依赖性，这与基于贝里曲率偶极子的预测存在定性差异。这些差异的根源是电子-声子散射导致的电子分布中的长寿命能谷极化。我们的发现有待立即开展实验验证。
英文摘要：
The nonlinear Hall effect has attracted much attention due to the famous, widely adopted interpretation in terms of the Berry curvature dipole in momentum space. Using ab initio Boltzmann transport equations, we find a 60% enhancement in the nonlinear Hall effect of p-doped GeTe and its noticeable frequency dependence, qualitatively different from the predictions based on the Berry curvature dipole. The origin of these differences is long-lived valley polarization in the electron distribution arising from electron-phonon scattering. Our findings await immediate experimental confirmation.
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