Quantum metric nonlinear Hall effect in a topological antiferromagnetic heterostructure.
Anyuan GaoYu-Fei LiuJian-Xiang QiuBarun GhoshThaís V TrevisanYugo OnishiChaowei HuTiema QianHung-Ju TienShao-Wen ChenMengqi HuangDamien BérubéHouchen LiChristian TzschaschelThao DinhZhe SunSheng-Chin HoShang-Wei LienBahadur SinghKenji WatanabeTakashi TaniguchiDavid C BellHsin LinTay-Rong ChangChunhui Rita DuArun BansilLiang FuNi NiPeter P OrthQiong MaSu-Yang XuPublished in: Science (New York, N.Y.) (2023)
Quantum geometry in condensed matter physics has two components: the real part quantum metric and the imaginary part Berry curvature. Whereas the effects of Berry curvature have been observed through phenomena such as the quantum Hall effect in 2D electron gases and the anomalous Hall effect (AHE) in ferromagnets, quantum metric has rarely been explored. Here, we report a nonlinear Hall effect induced by quantum metric dipole by interfacing even-layered MnBi 2 Te 4 with black phosphorus. The quantum metric nonlinear Hall effect switches direction upon reversing the AFM spins and exhibits distinct scaling that is independent of the scattering time. Our results open the door to discovering quantum metric responses predicted theoretically and pave the way for applications that bridge nonlinear electronics with AFM spintronics.