近日，华中科技大学李亮教授团队报道了蜂窝状反铁磁体中声子霍尔效应的热力学起源。2026年10月22日出版的《科学》杂志发表了这项成果。
由声子在各种绝缘体中产生的热霍尔效应的潜在机制尚待阐明。
研究组报道了镍磷三硫化物（NiPS?）中可观的热霍尔电导率；NiPS?是一种具有锯齿状反铁磁序的蜂窝层范德华堆叠结构。纵向热导率（κaa）和横向热导率（κab）在同一温度处达到峰值，并且在该峰值处的热霍尔角符合此前确定的界限。κab的幅度对沿b轴的磁化强度幅度极其敏感，但与声子平均自由程不相关，这指向其内禀起源。
附：英文原文
Title: Thermodynamic origin of the phonon Hall effect in a honeycomb antiferromagnet
Author: Qingkai Meng, Xiaokang Li, Jie Liu, Lingxiao Zhao, Chao Dong, Zengwei Zhu, Liang Li, Kamran Behnia
Issue&Volume: 2026-10-22
Abstract: The underlying mechanism of the thermal Hall effect generated by phonons in a variety of insulators is yet to be identified. In this work, we report on a sizable thermal Hall conductivity in nickel phosphorus trisulfide (NiPS3), a van der Waals stack of honeycomb layers with a zigzag antiferromagnetic order. The longitudinal (κaa) and the transverse (κab) thermal conductivities peak at the same temperature, and the thermal Hall angle, at this peak, respects a previously identified bound. The amplitude of κab is extremely sensitive to the amplitude of magnetization along the b axis but is not correlated with the phonon mean free path, which points to an intrinsic origin.
DOI: 10.1126/science.adt1992
Source: https://www.science.org/doi/10.1126/science.adt1992