Magnetizing topological surface states of Bi ₂ Se ₃ with a CrI ₃ monolayer

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 CrI3 monolayer can create a sizable spin splitting at the Dirac point of the topological surface states of Bi2Se3 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.

Exchange bias and quantum anomalous Hall effect in the MnBi 2 Te 4 /CrI 3 heterostructure

“…1. Both materials share the same triangular lattice but different in-plane lattice parameters, 7.04Å for CrI 3 and 4.36Å for MnBi 2 Te 4 from our DFT calculations, which is consistent with recent works [24,39,40]. A 2 × 2 supercell of CrI 3 can match well with a 3 × 3 supercell of MnBi 2 Te 4 .…”

Artificial Multiferroics and Enhanced Magnetoelectric Effect in van der Waals Heterostructures

“…By using a 2×2 supercell of monolayer Sc2CO2 to match bilayer CrI3, as shown in Figure 1a, the in-plane lattice mismatch can be reduced to be less than 2%, which is widely accepted in first-principles studies. [49][50][51] Monolayer Sc2CO2 is predicted to exhibit both in-plane and out-of-plane electric polarizations. 19 Free-standing monolayer Sc2CO2 exhibits an out-of-plane electric polarization of 1.60 C/cm 3 , which is reported to be the largest for a monolayer material.…”

Tunable electronic and magnetic properties of monolayer and bilayer Janus Cr2Cl3I3: a first-principles study

“…Recently, magnetism in 2D van der Waals (vdW) materials [14][15][16][17][18][19][20] has attracted much attention. As a possible modulating parameter, magnetism sets up a new routine of developing 2D devices for electronic and spintronic applications.…”

“…48,49 Moreover, strain 33,50 and stacking order 19,33,[48][49][50][51][52] are widely used methods to modulate the tunneling magneto-resistances, 29,53 magneto-optical effects, 54 light scattering 31 and topological properties of materials. 15,55,56 In this article, using first-principles methods with vdW interaction corrections, [57][58][59] we investigate the geometric, magnetic, and electronic properties and stability of ML Janus Cr 2 Cl 3 I 3 using hybrid functional-HSE06. 60,61 ML Janus Cr 2 Cl 3 I 3 breaks the out-of-plane mirror symmetry, which would introduce some new properties.…”