Journal
NATURE NANOTECHNOLOGY
Volume 15, Issue 6, Pages 437-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41565-020-0668-7
Keywords
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Funding
- ERC Consolidator Grant ELECNANO [766555]
- EC FP7-PEOPLE-2011-COFUND AMAROUT II
- Spanish Ramon y Cajal programme [RYC-2012-11133]
- Spanish Ministerio de Economia y Competitividad [FIS 2013-40667-P, FIS 2015-67287-P]
- Comunidad de Madrid [Y2018/NMT-4783, S2013/MIT-3007, S2013/MT-2850, S2013/MIT-2841]
- European Research Council [ERC320441-Chirallcarbon]
- MINECO of Spain [CTQ2017-83531-R, CTQ2016-81911-REDT]
- Severo Ochoa Programme for Centers of Excellence in RD (MINECO) [SEV-2016-0686]
- MEYS [CR LM2018110]
- Operational Programme Research, Development and Education - European Structural and Investment Funds
- Czech Ministry of Education, Youth and Sports [CZ.02.1.01/0.0/0.0/16_019/0000754]
- Praemium Academie of the Academy of Science of the Czech Republic
- Palacky University Olomouc in Olomouc, Czech Republic [IGA_PrF_2019_026]
- Projects of Large Research, Development, and Innovations Infrastructures [CESNET LM2015042]
- GACR [18-09914S]
- European Research Council (ERC) [766555] Funding Source: European Research Council (ERC)
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Topological band theory predicts that a topological electronic phase transition between two insulators must proceed via closure of the electronic gap. Here, we use this transition to circumvent the instability of metallic phases in pi-conjugated one-dimensional (1D) polymers. By means of density functional theory, tight-binding and GW calculations, we predict polymers near the topological transition from a trivial to a non-trivial quantum phase. We then use on-surface synthesis with custom-designed precursors to make polymers consisting of 1D linearly bridged acene moieties, which feature narrow bandgaps and in-gap zero-energy edge states when in the topologically non-trivial phase close to the topological transition point. We also reveal the fundamental connection between topological classes and resonant forms of 1D pi-conjugated polymers. Polymers commonly are semiconducting or insulating because of a sizable energy gap in the density of states around the Fermi level. Yet, the phase transition from topologically trivial to non-trivial in on-surface synthesized pi-conjugated polymers, due to a change of resonant form, stabilizes narrow bandgaps and bears in-gap zero-energy edge states in the non-trivial phase.
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