Van der Waals epitaxial growth of topological insulator Bi 2-xSbxTe3-ySey ultrathin nanoplate on electrically insulating fluorophlogopite mica

Ngoc Han Tu, Yoichi Tanabe, Khuong Kim Huynh, Yohei Sato, Hidetoshi Oguro, Satoshi Heguri, Kenji Tsuda, Masami Terauchi, Kazuo Watanabe, Katsumi Tanigaki

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15 Citations (Scopus)

Abstract

We report the growth of high quality Bi2-xSb xTe3-ySey 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 the BSTS-NPs. Raman spectra showing systematic change indicate that the thicknesses and compositions of the BSTS-NPs are indeed accurately controlled. Electrical transport demonstrates a robust Dirac cone carrier transport in the BSTS-NPs. Since the BSTS-NPs provide superior dominant surface transport of the tunable Dirac cone surface states with negligible contribution of the conduction of the bulk states, the BSTS-NPs provide an ideal platform to explore intrinsic physical phenomena as well as technological applications of 3-dimensional topological insulators in the future.

Original languageEnglish
Article number063104
JournalApplied Physics Letters
Volume105
Issue number6
DOIs
Publication statusPublished - 2014 Aug 11

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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