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

Abstract

We introduce time-reversal-symmetry breaking by doping Cr atoms into the topmost quintuple layer or into the bulk of Sb2Te3 thin films. We find that even 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 presence of surface or bulk magnetic doping. The magnitude of the mass term in the surface states increases with increasing Cr-doping level. Our observation suggests Cr-doped Sb2Te3 is a promising candidate for the realization of the proposed novel magnetoelectric effects.

18 pages, 4 figures

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• Chemical potential dependent gap-opening at the Dirac surface states of Bi2Se3 induced by aggregated substitutional Cr atoms
• Imaging two-component nature of Dirac-Landau levels in the topological surface state of Bi2Se3
• Magnetically induced spin reorientation on the surface of a topological insulator (a surface magnetic topological insulator MBE film)

Cited by in corpus (14)

• Colloquium: Topological Band Theory
• Colloquium: Quantum anomalous Hall effect
• Tailoring Exchange Couplings in Magnetic Topological Insulator/Antiferromagnet Heterostructures
• Direct observation of Landau level resonance and mass generation in Dirac semimetal Cd3As2 thin films
• Stepwise quantized surface states and delayed Landau level hybridization in Co cluster-decorated BiSbTeSe2 topological insulator devices
• Magnetic and defect probes of the SmB${}_6$ surface state
• Impurity states in the magnetic topological insulator V:(Bi,Sb)${}_2$Te${}_3$
• Severe Dirac Mass Gap Suppression in Sb_2Te_3-based Quantum Anomalous Hall Materials
• Impurity scattering on the surface of topological insulator thin films
• Electronic Fingerprints of Cr and V Dopants in Topological Insulator Sb2Te3
• Long-time relaxation dynamics of a spin coupled to a Chern insulator
• Spin Berry curvature of the Haldane model
• Phonon and defect mediated quantum anomalous Hall insulator to metal transition in magnetically doped topological insulators
• Prediction of at topological $p+ip$ excitonic insulator with parity anomaly