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Full-Text Articles in Physical Sciences and Mathematics
Mass Acquisition Of Dirac Fermions In Magnetically Doped Topological Insulator Sb2te3 Films, Yeping Jiang, Canli Song, Zhi Li, Mu Chen, Richard L. Greene, Ke He, Lili Wang, Xiaowei Chen, Xu-Cun Ma, Qi-Kun Xue
Mass Acquisition Of Dirac Fermions In Magnetically Doped Topological Insulator Sb2te3 Films, Yeping Jiang, Canli Song, Zhi Li, Mu Chen, Richard L. Greene, Ke He, Lili Wang, Xiaowei Chen, Xu-Cun Ma, Qi-Kun Xue
Australian Institute for Innovative Materials - Papers
We report on the mass acquisition of Dirac fermions by doping Cr into the topmost quintuple layer or into the bulk of Sb2Te3 topological insulator films. By careful investigation of the scanning tunneling microscopy/spectroscopy on the films, we find that the Landau level spectrum keeps a good quality even at a high Cr-doping level, enabling a demonstration of deviation of the zeroth 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. …
Semimetal-Semiconductor Transition And Giant Linear Magnetoresistances In Three-Dimensional Dirac Semimetal Bi0.96sb0.04 Single Crystals, Zengji Yue, Xiaolin Wang, Shi-Shen Yan
Semimetal-Semiconductor Transition And Giant Linear Magnetoresistances In Three-Dimensional Dirac Semimetal Bi0.96sb0.04 Single Crystals, Zengji Yue, Xiaolin Wang, Shi-Shen Yan
Australian Institute for Innovative Materials - Papers
Three-dimensional (3D) Dirac semimetals are new quantum materials and can be viewed as 3D analogues of graphene. Many fascinating electronic properties have been proposed and realized in 3D Dirac semimetals, which demonstrate their potential applications in next generation quantum devices. Bismuth-antimony Bi1− x Sb x can be tuned from a topological insulator to a band insulator through a quantum critical point at x ≈ 4%, where 3D Dirac fermions appear. Here, we report on a magnetotransport study of Bi1− x Sb x at such a quantum critical point. An unusual magnetic-field induced semimetal-semiconductor phase transition was observed in the Bi0.96Sb0.04 …