Fig. 2
Reproduced with permission from Chang et al., Science 340, 167 (2013). Copyright 2013 The American Association for the Advancement of Science [24]. c, d Reproduced with permission from Katmis et al., Nature 553, 513 (2016). Copyright 2016 Nature Publishing Group [32]
Induced magnetic moment in TIs. a Schematic of the QAHE in a magnetic TI thin film. The magnetization direction (M) is indicated by red arrows. The chemical potential of the film can be controlled by a gate voltage applied on the back side of the dielectric substrate. b Magnetic field dependence of QAHE at different gate voltages in Cr0.15(Bi0.1Sb0.9)1.85Te3 film. c Schematic of the polarized neutron reflectivity (PNR) experiment for Bi2Se3/EuS bilayer film. d Observation of ferromagnetic order in Bi2Se3/EuS bilayer sample via magnetic proximity coupling to the EuS measured by PNR measurements. a, b