TCNQ Physisorption on the Topological Insulator Bi2 Se3

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Ada Della PiaG Costantini

Abstract

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 (Bi2 Se3 ), 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 wea...Continue Reading

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Citations

Aug 20, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Andrew Tan, Pengpeng Zhang
Jan 26, 2021·Physical Chemistry Chemical Physics : PCCP·Anton TamtöglWolfgang E Ernst
Oct 15, 2019·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Adrian RuckhoferWolfgang E Ernst
Sep 12, 2020·The Journal of Physical Chemistry Letters·Xi DongPengpeng Zhang

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