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TCNQ physisorption on the topological insulator Bi2Se3 P. A. Della, S. Lisi, O. De Luca [et al.]

Contributor(s): Lisi, Simone | De Luca, Oreste | Warr, Daniel A | Lawrence, J | Otrokov, Mikhail M | Aliev, Ziya S | Chulkov, Evgueni V | Agostino, Raffaele G | Arnau, Andrés | Della Pia, Ada | Papagno, Marco | Costantini, GiovanniMaterial type: ArticleArticleContent type: Текст Media type: электронный Subject(s): топологические изоляторы | физисорбция | тетрацианохинодиметан | селенид висмутаGenre/Form: статьи в журналах Online resources: Click here to access online In: ChemPhysChem Vol. 19, № 18. P. 2405-2410Abstract: Topological insulators are promising candidates for spintronic applications due to their topologically protected, spin‐momentum locked and gapless surface states. The breaking of the time‐reversal symmetry after the introduction of magnetic impurities, such as 3d transition metal atoms embedded in two‐dimensional molecular networks, could lead to several phenomena interesting for device fabrication. The first step towards the fabrication of metal‐organic coordination networks on the surface of a topological insulator is to investigate the adsorption of the pure molecular layer, which is the aim of this study. Here, the effect of the deposition of the electron acceptor 7,7,8,8‐tetracyanoquinodimethane (TCNQ) molecules on the surface of a prototypical topological insulator, bismuth selenide (Bi2Se3), is investigated. Scanning tunneling microscope images at low‐temperature reveal the formation of a highly ordered two‐dimensional molecular network. The essentially unperturbed electronic structure of the topological insulator observed by photoemission spectroscopy measurements demonstrates a negligible charge transfer between the molecular layer and the substrate. Density functional theory calculations confirm the picture of a weakly interacting adsorbed molecular layer. These results reveal significant potential of TCNQ for the realization of metal‐organic coordination networks on the topological insulator surface.
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Topological insulators are promising candidates for spintronic applications due to their topologically protected, spin‐momentum locked and gapless surface states. The breaking of the time‐reversal symmetry after the introduction of magnetic impurities, such as 3d transition metal atoms embedded in two‐dimensional molecular networks, could lead to several phenomena interesting for device fabrication. The first step towards the fabrication of metal‐organic coordination networks on the surface of a topological insulator is to investigate the adsorption of the pure molecular layer, which is the aim of this study. Here, the effect of the deposition of the electron acceptor 7,7,8,8‐tetracyanoquinodimethane (TCNQ) molecules on the surface of a prototypical topological insulator, bismuth selenide (Bi2Se3), is investigated. Scanning tunneling microscope images at low‐temperature reveal the formation of a highly ordered two‐dimensional molecular network. The essentially unperturbed electronic structure of the topological insulator observed by photoemission spectroscopy measurements demonstrates a negligible charge transfer between the molecular layer and the substrate. Density functional theory calculations confirm the picture of a weakly interacting adsorbed molecular layer. These results reveal significant potential of TCNQ for the realization of metal‐organic coordination networks on the topological insulator surface.

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