Journal
2D MATERIALS
Volume 5, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aa9ea0
Keywords
planar stanene; scanning tunneling microscopy (STM); core-level spectroscopy (CLS); density functional theory (DFT)
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [15H03677, 22560022]
- Synchrotron Radiation Research Center, Nagoya University [2017001]
- European Research Council [ERC-2015-AdG-694097]
- Grupos Consolidados [IT578-13]
- European Union [676580, 646259]
- European Union's Horizon research and innovation programme under the Marie Sklodowska-Curie grant [709382]
- Nagoya University
- Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [15H03677] Funding Source: KAKEN
- Marie Curie Actions (MSCA) [709382] Funding Source: Marie Curie Actions (MSCA)
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Artificial post-graphene elemental 2D materials have received much attention recently. Especially, stanene, the tin analogue of graphene, is expected to be a robust 2D topological insulator, even above room temperature. We have grown epitaxial 2D stanene on a Ag(111) single crystal template and determined its crystalline structure synergetically by scanning tunneling microscopy, high-resolution synchrotron radiation photoemission spectroscopy, and advanced first principles calculations. From the STM images, we show that stanene forms a nearly planar structure in large domains. A detailed core-level spectroscopy analysis as well as DFT calculations reveal that the stanene sheet lays over an ordered 2D Ag2Sn surface alloy, but not directly on a bulk-terminated Ag(111) surface. The electronic structure exhibits a characteristic 2D band with parabolic dispersion due to the non-negligible interaction with the underlying surface alloy.
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