Substitution-induced spin-splitted surface states in topological insulator (Bi1−xSbx)2Te3

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作者：
Xiaoyue He
Hui Li
Lan Chen
Kehui Wu
机构：
[1] Institute of Physics,
[2] Chinese Academy of Science,undefined
[3] Key Laboratory of Standardization and Measurement for Nanotechnology,undefined
[4] Chinese Academy of Sciences,undefined
[5] National Center for Nanoscience and Technology,undefined
[6] Collaborative Innovation Center of Quantum Matter,undefined
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Scientific Reports | / 5卷
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摘要：
We present a study on surface states of topological insulator (Bi1−xSbx)2Te3 by imaging quasiparticle interference patterns (QPI) using low temperature scanning tunneling microscope. Besides the topological Dirac state, we observed another surface state with chiral spin texture within the conduction band range. The quasiparticle scattering in this state is selectively suppressed. Combined with first-principles calculations, we attribute this state to a spin-splitted band induced by the substitution of Bi with Sb atoms. Our results demonstrate that the coexistence of topological order and alloying may open wider tunability in quantum materials.
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