Intrinsic Topological Insulator Bi(1.5)Sb(0.5)Te(3-x)Se(x) Thin Crystals

The quaternary topological insulator (Bi,Sb)(2)(Te,Se)(3) has demonstrated topological surface states with an insulating bulk. Scientists have identified an optimized composition of Bi(1.5)Sb(0.5)Te(1.7)Se(1.3) with the highest resistivity reported. But the physics that drive to this composition rem...

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Detalles Bibliográficos
Autores principales: Wang, Wei, Li, Li, Zou, Wenqin, He, Liang, Song, Fengqi, Zhang, Rong, Wu, Xiaoshan, Zhang, Fengming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4300459/
https://www.ncbi.nlm.nih.gov/pubmed/25604579
http://dx.doi.org/10.1038/srep07931
Descripción
Sumario:The quaternary topological insulator (Bi,Sb)(2)(Te,Se)(3) has demonstrated topological surface states with an insulating bulk. Scientists have identified an optimized composition of Bi(1.5)Sb(0.5)Te(1.7)Se(1.3) with the highest resistivity reported. But the physics that drive to this composition remains unclear. Here we report the crystal structure and the magneto-transport properties of Bi(1.5)Sb(0.5)Te(3-x)Se(x) (BSTS) series. A correlation between the structure and the physical properties has been revealed. We found out that within the rhombohedral structure, the composition with most Te substituting Se has the highest resistivity. On the other hand, segregation of other composition phases will introduce much higher bulk concentration.

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