Planar Hall plateau in magnetic Weyl semimetals  

磁性外尔半金属中的平面霍尔平台

作　　者：Lei Li Chaoxi Cui Run-Wu Zhang Zhi-Ming Yu Yugui Yao 黎磊;崔朝喜;张闰午;余智明;姚裕贵

机构地区：[1]Centre for Quantum Physics,Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE),School of Physics,Beijing Institute of Technology,Beijing 100081,China [2]Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems,School of Physics,Beijing Institute of Technology,Beijing 100081,China [3]International Center for Quantum Materials,Beijing Institute of Technology,Zhuhai 519000,China

出　　处：《Science Bulletin》2025年第2期187-192,共6页科学通报(英文版)

基　　金：supported by the National Key Research and Development Program of China(2020YFA0308800);the National Natural Science Foundation of China(12004035,12234003 and 12321004);the China Postdoctoral Science Foundation(2021TQ0043 and 2021M700437);Beijing Institute of Technology Research Fund Program for Young Scholars。

摘　　要：Despite the rapid progress in the study of planar Hall effect(PHE)in recent years,all the previous works only showed that the PHE is connected to local geometric quantities,such as Berry curvature.Here,for the first time,we point out that the PHE in magnetic Weyl semimetals is directly related to a global quantity,namely,the Chern number of the Weyl point.This leads to a remarkable consequence that the PHE observation predicted here is robust against many system details,including the Fermi energy.The main difference between non-magnetic and magnetic Weyl points is that the latter breaks time-reversal symmetry T,thus generally possessing an energy tilt.Via semiclassical Boltzmann theory,we investigate the PHE in generic magnetic Weyl models with energy tilt and arbitrary Chern number.We find that by aligning the magnetic and electric fields in the same direction,the trace of the PHE conductivity contributed by Berry curvature and orbital moment is proportional to the Chern number and the energy tilt of the Weyl points,resulting in a previously undiscovered quantized PHE plateau by varying the Fermi energy.We further confirm the existence of PHE plateaus in a more realistic lattice model without T symmetry.By proposing a new quantized physical quantity,our work not only provides a new tool for extracting the topological character of the Weyl points but also suggests that the interplay between topology and magnetism can give rise to intriguing physics.

关 键 词：Magnetic Weyl semimetals Planar Hall effect Quantized plateau Chern number 

分 类 号：O17[理学—数学]