Multiple layer Hall states in the topological magnet family
Phys. Rev. B 111, 235427 – Published 12 June, 2025
DOI: https://doi.org/10.1103/2jdz-kdn1
Abstract
Layer Hall effect, where electrons can deflect to opposite directions in different layers of layered antiferromagnetic materials, is a promising physical phenomenon in future spatial-resolved layertronics application. Here, we demonstrate that multiple layer Hall states including layer-polarized Hall, quantized anomalous layer Hall (QALH), and nearly high-Chern-number QALH effects can be sequentially realized in the magnetic topological insulator family. First, with applied external electric field and increased field strength to 0.4 V/Å, layer-polarized Hall and QALH effect with fully quantized Hall conductivity plateau begins to appear in the bilayer. Furthermore, by tuning the electric field direction and Fermi level, QALH effect can be effectively switched between layers and the number of peaks in Hall conductivity exhibits a pronounced parity-dependent behavior. Remarkably, through synergetic modulation of external magnetic and electric fields, a nearly high-Chern-number QALH effect can be observed in an odd-layer system. The above findings provide a nearly ideal topological magnet family harboring various layer Hall effects especially with fully quantized-layered transport.