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24 April 2024

» arxiv » 0912.5054

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Growth dynamics and thickness-dependent electronic structure of topological insulator Bi2Te3 thin films on Si
Yao-Yi Li ; Guang Wang ; Xie-Gang Zhu ; Min-Hao Liu ; Cun Ye ; Xi Chen ; Ya-Yu Wang ; Ke He ; Li-Li Wang ; Xu-Cun Ma ; Hai-Jun Zhang ; Xi Dai ; Zhong Fang ; Xin-Cheng Xie ; Ying Liu ; Xiao-Liang Qi ; Jin-Feng Jia ; Shou-Cheng Zhang ; Qi-Kun Xue ;
Date:	27 Dec 2009
Abstract:	We use real-time reflection high energy electron diffraction intensity oscillation to establish the Te-rich growth dynamics of topological insulator thin films of Bi2Te3 on Si(111) substrate by molecular beam epitaxy. In situ angle resolved photoemission spectroscopy (ARPES), scanning tunneling microscopy and ex situ transport measurements reveal that the as-grown Bi2Te3 films without any doping are an intrinsic topological insulator with its Fermi level intersecting only the metallic surface states. Experimentally, we find that the single-Dirac-cone surface state develops at a thickness of two quintuple layers (2 QL). Theoretically, we show that the interaction between the surface states from both sides of the film, which is determined by the penetration depth of the topological surface state wavefunctions, sets this lower thickness limit.
Source:	arXiv, 0912.5054
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