English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The quantum anomalous Hall effect (QAHE) and magnetic Weyl semimetals (WSMs)are topological states induced by intrinsic magnetic moments and spin-orbitcoupling. Their similarity suggests the possibility of achieving the QAHE bydimensional confinement of a magnetic WSM along one direction. In this study,we investigate the emergence of the QAHE in the two-dimensional (2D) limit ofmagnetic WSMs due to finite size effects in thin films and step-edges. Wedemonstrate the feasibility of this approach with effective models and realmaterials. To this end, we have chosen the layered magnetic WSMCo$_3$Sn$_2$S$_2$, which features a large anomalous Hall conductivity andanomalous Hall angle in its 3D bulk, as our material candidate. In the 2D limitof Co$_3$Sn$_2$S$_2$ two QAHE states exist depending on the stoichiometry ofthe 2D layer. One is a semimetal with a Chern number of 6, and the other is aninsulator with a Chern number of 3. The latter has a band gap of 0.05 eV, whichis much larger than that in magnetically doped topological insulators. Ourfindings naturally explain the existence of chiral states in step edges of bulkCo$_3$Sn$_2$S$_2$ which habe been reported in a recent experiment at $T = 4K$and present a realistic avenue to realize QAH states in thin films of magneticWSMs.

Emerging chiral edge states from the confinement of a magnetic Weyl semimetal in Co$_3$Sn$_2$S$_2$