Electronic Characterization of a Charge-Transfer Complex Monolayer on Graphene

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-06-22
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
ACS Nano
Abstract
Organic charge-transfer complexes (CTCs) formed by strong electron acceptor and strong electron donor molecules are known to exhibit exotic effects such as superconductivity and charge density waves. We present a low-temperature scanning tunneling microscopy and spectroscopy (LT-STM/STS) study of a two-dimensional (2D) monolayer CTC of tetrathiafulvalene (TTF) and fluorinated tetracyanoquinodimethane (F4TCNQ), self-assembled on the surface of oxygen-intercalated epitaxial graphene on Ir(111) (G/O/Ir(111)). We confirm the formation of the charge-transfer complex by dI/dV spectroscopy and direct imaging of the singly occupied molecular orbitals. High-resolution spectroscopy reveals a gap at zero bias, suggesting the formation of a correlated ground state at low temperatures. These results point to the possibility to realize and study correlated ground states in charge-transfer complex monolayers on weakly interacting surfaces.
Description
| openaire: EC/H2020/788185/EU//E-DESIGN
Keywords
charge density wave (CDW), charge-transfer complex, epitaxial graphene, FTCNQ, scanning tunneling microscopy (STM), TTF
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Citation
Kumar, A, Banerjee, K, Ervasti, M M, Kezilebieke, S, Dvorak, M, Rinke, P, Harju, A & Liljeroth, P 2021, ' Electronic Characterization of a Charge-Transfer Complex Monolayer on Graphene ', ACS Nano, vol. 15, no. 6, pp. 9945-9954 . https://doi.org/10.1021/acsnano.1c01430