Projects per year
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.
Original language | English |
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Pages (from-to) | 9945-9954 |
Number of pages | 10 |
Journal | ACS Nano |
Volume | 15 |
Issue number | 6 |
Early online date | 2021 |
DOIs | |
Publication status | Published - 22 Jun 2021 |
MoE publication type | A1 Journal article-refereed |
Keywords
- charge density wave (CDW)
- charge-transfer complex
- epitaxial graphene
- FTCNQ
- scanning tunneling microscopy (STM)
- TTF
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ADaM/Liljeroth jatko: Artificial designer materials
Liljeroth, P., Amini, M., Kipnis, A., Otero Fumega, A., Choi, S., Gonzalez Herrero, H., Aapro, M., Ganguli, S. C. & Vano, V.
01/01/2022 → 31/12/2023
Project: Academy of Finland: Other research funding
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ADaM: Artificial designer materials
Liljeroth, P., Aapro, M., Amini, M., Gonzalez Herrero, H., Khosravian, M., Drost, R., Kipnis, A., Otero Fumega, A., Arslan, B. & Karjasilta, A.
01/01/2019 → 31/12/2023
Project: Academy of Finland: Other research funding
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E-DESIGN: Artificial designer materials
Liljeroth, P., Alldritt, B., Huang, X., Huda, M. N., Xu, C., Ganguli, S. C., Vano, V. & Yan, L.
15/08/2018 → 31/08/2024
Project: EU: ERC grants