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  Electronic Structure of the Dark Surface of the Weak Topological Insulator Bi14Rh3I9

Pauly, C., Rasche, B., Koepernik, K., Richter, M., Borisenko, S., Liebmann, M., et al. (2016). Electronic Structure of the Dark Surface of the Weak Topological Insulator Bi14Rh3I9. ACS Nano, 10(4), 3995-4003. doi:10.1021/acsnano.6b00841.

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 Creators:
Pauly, Christian1, Author
Rasche, Bertold1, Author
Koepernik, Klaus1, Author
Richter, Manuel1, Author
Borisenko, Sergey1, Author
Liebmann, Marcus1, Author
Ruck, Michael2, Author           
van den Brink, Jeroen1, Author
Morgenstern, Markus1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863444              

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 Abstract: Compound Bi14Rh3I9 consists of ionic stacks of intermetallic [(Bi4Rh)(3)I](2+) and insulating [Bi2I8](2-) layers and has been identified to be a weak topological insulator. Scanning tunneling microscopy revealed the robust edge states at all step edges of the cationic layer as a topological fingerprint. However, these edge states are found 0.25 eV below the Fermi level, which is an obstacle for transport experiments. Here, we address this obstacle by comparing results of density functional slab calculations with scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy. We show that the n-type doping of the intermetallic layer is intrinsically caused by the polar surface and is well-screened toward the bulk. In contrast, the anionic "spacer" layer shows a gap at the Fermi level, both on the surface and in the bulk; that is, it is not surface-doped due to iodine desorption. The well-screened surface dipole implies that a buried edge state, probably already below a single spacer layer, is located at the Fermi level. Consequently, a multilayer step covered by a spacer layer could provide access to the transport properties of the topological edge states. In addition, we find a lateral electronic modulation of the topologically nontrivial surface layer, which is traced back to the coupling with the underlying zigzag chain structure of the spacer layer.

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Language(s): eng - English
 Dates: 2016-03-112016-03-11
 Publication Status: Issued
 Pages: -
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 Rev. Type: -
 Identifiers: ISI: 000375245000013
DOI: 10.1021/acsnano.6b00841
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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 (4) Sequence Number: - Start / End Page: 3995 - 4003 Identifier: Other: 1936-0851
CoNE: https://pure.mpg.de/cone/journals/resource/1936-0851