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Substitution-induced spin-splitted surface states in topological insulator (Bi(1−x)Sb(x))(2)Te(3)

We present a study on surface states of topological insulator (Bi(1−x)Sb(x))(2)Te(3) 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 co...

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Detalles Bibliográficos
Autores principales: He, Xiaoyue, Li, Hui, Chen, Lan, Wu, Kehui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4351528/
https://www.ncbi.nlm.nih.gov/pubmed/25743262
http://dx.doi.org/10.1038/srep08830
Descripción
Sumario:We present a study on surface states of topological insulator (Bi(1−x)Sb(x))(2)Te(3) 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.