Enhanced Quantum Anomalous Hall Effect with an Active Capping Layer.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37278509.
- Also identified by DOI 10.1021/acs.nanolett.3c01313.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The quantum anomalous Hall effect (QAHE) was discovered a decade ago but is still not utilized beyond a handful of research groups, due to numerous limitations such as extremely low temperature, electric-field-effect gating requirement, small sample sizes, and environmental aging effect. Here, we present a robust platform that provides effective solutions to these problems. Specifically, on this platform, we observe QAH signatures at record-high temperatures, with a Hall conductance of 1.00 <i>e</i><sup>2</sup>/<i>h</i> at 2.0 K, 0.98 <i>e</i><sup>2</sup>/<i>h</i> at 4.2 K, and 0.92 <i>e</i><sup>2</sup>/<i>h</i> at 10 K, on centimeter-scale substrates, without electric-field-effect gating. The key ingredient is an active CrO<sub><i>x</i></sub> capping layer, which substantially boosts the ferromagnetism while suppressing environmental degradation. With this development, QAHE will now be accessible to much broader applications than before.