Year: 2026
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Topological insulators lacking time-reversal symmetry can exhibit the quantum anomalous Hall effect. Odd-layer thick MnBi 2 Te 4 is a promising platform due to its intrinsic magnetic nature; however, quantization is rarely observed in it. Our magnetoresistance measurements in the antiferromagnetic phase indicate, instead of a quantum anomalous Hall insulator, the presence of a trivial insulator state likely due to disorder, while in a high magnetic field, a Chern insulator state appears. From the magnetic field and temperature dependence, we estimate that the interlayer exchange coupling is enhanced by hydrostatic pressure while the intralayer coupling is weakened. The trivial band gap is also reduced, suggesting the role of disorder is weakened upon compression of the layers.
Source: Nano Letters
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Funders: Alfred P. Sloan Foundation, Alexander von Humboldt-Stiftung, Corning Incorporated Foundation, Graphene Flagship, European Cooperation in Science and Technology, Ministry of Education, Culture, Sports, Science and Technology, Hungarian Scientific Research Fund, HORIZON EUROPE Framework Programme, European Research Council, Japan Society for the Promotion of Science, Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, National Research, Development and Innovation Office, Air Force Office of Scientific Research, HORIZON EUROPE Widening participation and spreading excellence
OpenAlex ID: W7126077581