Sunday, May 19, 2013

1305.3766 (Yeping Jiang et al.)

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

Yeping Jiang, Zhi Li, Canli Song, Mu Chen, Richard L. Greene, Ke He, Lili Wang, Xi Chen, Xucun Ma, Qi-Kun Xue
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.
View original: http://arxiv.org/abs/1305.3766

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