Magnetizing topological surface states of Bi<sub>2</sub>Se<sub>3</sub> with a CrI<sub>3</sub> monolayer.
basic_science · Level V
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- Record sourced from PubMed, PMID 31172028.
- Also identified by DOI 10.1126/sciadv.aaw1874 and PMC identifier 6544448.
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Abstract
To magnetize surfaces of topological insulators without damaging their topological feature is a crucial step for the realization of the quantum anomalous Hall effect (QAHE) and remains as a challenging task. Through density functional calculations, we found that adsorption of a semiconducting two-dimensional van der Waals (2D-vdW) ferromagnetic CrI<sub>3</sub> monolayer can create a sizable spin splitting at the Dirac point of the topological surface states of Bi<sub>2</sub>Se<sub>3</sub> films. Furthermore, general rules that connect different quantum and topological parameters are established through model analyses. This work provides a useful guideline for the realization of QAHE at high temperatures in heterostructures of 2D-vdW magnetic monolayers and topological insulators.