Van der Waals epitaxial growth of topological insulator Bi${}_{2-x}$Sb${}_x$Te${}_{3-y}$Se${}_y$ ultrathin nanoplate on electrically insulating fluorophlogopite mica

Abstract

We report the growth of high quality Bi${}_{2-x}$Sb${}_x$Te${}_{3-y}$Se${}_y$ ultrathin nanoplates (BSTS-NPs) on an electrically insulating fluorophlogopite mica substrate using a catalyst-free vapor solid method. Under an optimized pressure and suitable Ar gas flow rate, we control the thickness, the size and the composition of BSTS-NPs. Raman spectra showing systematic change indicate that the thicknesses and compositions of BSTS-NPs are indeed accurately controlled. Electrical transport demonstrates that a robust Dirac cone carrier transport in BSTS-NPs. Since BSTS-NPs provide superior dominant surface transport of the tunable Dirac cone surface states with negligible contribution of the conduction of the bulk states, BSTS-NPs provide an ideal platform to explore intrinsic physical phenomena as well as technological applications of 3-dimensional topological insulators in the future.

arXiv comment12 pages, 3 figures, To be published in APL

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Cited by in corpus (9)

• In-plane Topological p-n Junction in the Three-Dimensional Topological Insulator Bi${}_{2-x}$Sb${}_x$Te${}_{3-y}$Se${}_y$
• Shubnikov-de Haas oscillations from topological surface states of metallic Bi${}_2$Se${}_{2.1}$Te${}_{0.9}$
• Large-Area and Transferred High-Quality Three-Dimensional Topological Insulator Bi2-xSbxTe3-ySey Ultrathin Film by Catalyst-Free Physical Vapor Deposition
• Origin and evolution of surface spin current in topological insulators
• Proximity-Induced Spin-Orbit Coupling in Graphene-Bi${}_{1.5}$Sb${}_{0.5}$Te${}_{1.7}$Se${}_{1.3}$ Heterostructures
• Phase-coherent transport in catalyst-free vapor phase deposited Bi${}_2$Se${}_3$ crystals
• Versatile Large-Area Custom-Feature van der Waals Epitaxy of Topological Insulators
• Reducing the impact of bulk doping on transport properties of Bi-based 3D topological insulators
• Vapor phase growth and characterization of van der Waals BiSbTeSe platelets on semiconducting MoS2