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  Annealing-Induced Bi Bilayer on Bi2Te3 Investigated via Quasi-Particle-Interference Mapping

Schouteden, K., Govaerts, K., Debehets, J., Thupakula, U., Chen, T., Li, Z., et al. (2016). Annealing-Induced Bi Bilayer on Bi2Te3 Investigated via Quasi-Particle-Interference Mapping. ACS Nano, 10(9), 8778-8787. doi:10.1021/acsnano.6b04508.

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Schouteden, Koen1, Author
Govaerts, Kirsten1, Author
Debehets, Jolien1, Author
Thupakula, Umamahesh1, Author
Chen, Taishi2, Author           
Li, Zhe1, Author
Netsou, Asteriona1, Author
Song, Fengqi1, Author
Lamoen, Dirk1, Author
Van Haesendonck, Chris1, Author
Partoens, Bart1, Author
Park, Kyungwha1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

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 Abstract: Topological insulators (TIs) are renowned for their exotic topological surface states (TSSs) that reside in the top atomic layers, and hence, detailed knowledge of the surface top atomic layers is of utmost importance. Here we present the remarkable morphology changes of Bi2Te3 surfaces, which have been freshly cleaved in air, upon subsequent systematic annealing in ultrahigh vacuum and the resulting effects on the local and area averaging electronic properties of the surface states, which are investigated by combining scanning tunneling microscopy (STM), scanning tunneling spectroscopy (STS), and Auger electron spectroscopy (AES) experiments with density functional theory (DFT) calculations. Our findings demonstrate that the annealing induces the formation of a Bi bilayer atop the Bi2Te3 surface. The adlayer results in n-type doping, and the atomic defects act as scattering centers of the TSS electrons. We also investigated the annealing-induced Bi bilayer surface on Bi2Te3 via voltage dependent quasi-particle-interference (QPI) mapping of the surface local density of states and via comparison with the calculated constant-energy contours and QPI patterns. We observed closed hexagonal patterns in the Fourier transform of real-space QPI maps with secondary outer spikes. DFT calculations attribute these complex QPI patterns to the appearance of a "second" cone due to the surface charge transfer between the Bi bilayer and the Bi2Te3. Annealing in ultrahigh vacuum offers a facile route for tuning of the topological properties and may yield similar results for other topological materials.

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Language(s): eng - English
 Dates: 2016-09-012016-09-01
 Publication Status: Issued
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000384399300073
DOI: 10.1021/acsnano.6b04508
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Title: ACS Nano
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 10 (9) Sequence Number: - Start / End Page: 8778 - 8787 Identifier: Other: 1936-0851
CoNE: https://pure.mpg.de/cone/journals/resource/1936-0851