Science#02 in May 2026 EditionQuantized anomalous Hall effect observed in intrinsic magnetic topological insulator superlattices
Jian-Xun Wang, Sophie Martin, Alexei Smirnov et al.
OPENSTEM EDITORIAL SUMMARY
What the research examines
Physicists synthesize MnBi2Te4/(Bi2Te3)m superlattice thin films with customized van der Waals spacing, observing quantized Hall resistance (h/e²) at zero magnetic field up to 14.5 Kelvin, substantially higher than single-flake records.
Why it may matter
A vital step toward zero-magnetic-field dissipationless topological electronic circuits and quantum metrology standards.
What to examine carefully
Antiferromagnetic domain wall scattering still produces residual longitudinal resistance at temperatures above 15 K.
Editorial scope: This is a concise, independently written introduction based on the publisher information, not a full systematic review or independent replication. It must not replace reading the original methods, limitations and conclusions.
STUDENT RESEARCH LENS · ORIGINAL OPENSTEM NOTES
Try a small, reproducible follow-up
Calculate the exchange gap and Chern number for a 2D topological Dirac cone coupled to a ferromagnetic exchange field.
Questions to investigate
- How was the magnetic interlayer exchange coupling tuned from antiferromagnetic to ferromagnetic?
- What molecular beam epitaxy growth parameters suppressed antisite defect formation in the crystal lattice?
These are independently proposed educational investigations, not activities that the original research authors claim to have completed.
Publication & researcher information
JournalNature Materials
Published online2026-05-09
Authors (selected)Jian-Xun Wang, Sophie Martin, Alexei Smirnov et al.
University / laboratoryTsinghua University
CountryChina
Multi-author research may involve universities in several countries. Unverified institutions and contact addresses are not inferred from authors' names.