1. A case study for the formation of stanene on a metal surface.
- Author
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Maniraj, M., Stadtmüller, B., Jungkenn, D., Düvel, M., Emmerich, S., Shi, W., Stöckl, J., Lyu, L., Kollamana, J., Wei, Z., Jurenkow, A., Jakobs, S., Yan, B., Steil, S., Cinchetti, M., Mathias, S., and Aeschlimann, M.
- Subjects
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METALLIC surfaces , *TOPOLOGICAL insulators , *FERMI level , *SPIN polarization , *PHOTOELECTRON spectroscopy - Abstract
The discovery and realization of graphene as an ideal two-dimensional (2D) material has triggered extensive efforts to create similar 2D materials with exciting spin-dependent properties. Here, we report on a novel Sn 2D superstructure on Au(111) that shows similarities and differences to the expected electronic features of ideal stanene. Using spin- and angle-resolved photoemission spectroscopy, we find that a particular Sn/Au superstructure reveals a linearly dispersing band centered at the Γ ¯ -point and below the Fermi level with anti-parallel spin polarization and a Fermi velocity of vF ≈ 1×106 m/s, the same value as for graphene. We attribute the origin of the band structure to the hybridization between the Sn and the Au orbitals at the 2D Sn-Au interface. Considering that free-standing stanene simply cannot exist, our investigated structure is an important step towards the search of useful stanene-like overstructures for future technological applications. The successful isolation of a single layer of graphene has led to great interest in finding other 2D materials with similar electronic characteristics with additional spin-dependent phenomena. In this work, a 2D allotrope of Sn is grown on an Au(111) surface and shown through angle-resolved photoemission spectroscopy to have a linear band dispersion at the zone center and anti-parallel spin polarization. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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