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We introduce time-reversal-symmetry breaking by doping Cr atoms into thetopmost quintuple layer or into the bulk of Sb2Te3 thin films. We find thateven at a high Cr-doping level the Landau level spectrum keeps a good quality,enabling the first demonstration of deviation of the zero-mode Landau level,induced by the acquisition of a mass term in the surface states in the presenceof surface or bulk magnetic doping. The magnitude of the mass term in thesurface states increases with increasing Cr-doping level. Our observationsuggests Cr-doped Sb2Te3 is a promising candidate for the realization of theproposed novel magnetoelectric effects.

Mass acquisition of Dirac fermions in Cr-doped topological insulator Sb2Te3 films