Topological frustration induces unconventional magnetism in a nanographene

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Topological frustration induces unconventional magnetism in a nanographene. / Mishra, Shantanu; Beyer, Doreen; Eimre, Kristjan; Shawulienu, Kezilebieke; Berger, Reinhard; Gröning, Oliver; Pignedoli, Carlo A.; Müllen, Klaus; Liljeroth, Peter; Ruffieux, Pascal; Feng, Xinliang; Fasel, Roman.

julkaisussa: Nature Nanotechnology, Vuosikerta 15, 09.12.2019, s. 22–28.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Harvard

Mishra, S, Beyer, D, Eimre, K, Shawulienu, K, Berger, R, Gröning, O, Pignedoli, CA, Müllen, K, Liljeroth, P, Ruffieux, P, Feng, X & Fasel, R 2019, 'Topological frustration induces unconventional magnetism in a nanographene', Nature Nanotechnology, Vuosikerta. 15, Sivut 22–28. https://doi.org/10.1038/s41565-019-0577-9

APA

Vancouver

Author

Mishra, Shantanu ; Beyer, Doreen ; Eimre, Kristjan ; Shawulienu, Kezilebieke ; Berger, Reinhard ; Gröning, Oliver ; Pignedoli, Carlo A. ; Müllen, Klaus ; Liljeroth, Peter ; Ruffieux, Pascal ; Feng, Xinliang ; Fasel, Roman. / Topological frustration induces unconventional magnetism in a nanographene. Julkaisussa: Nature Nanotechnology. 2019 ; Vuosikerta 15. Sivut 22–28.

Bibtex - Lataa

@article{5bead3f24c5a44c19bc864bfe3631940,
title = "Topological frustration induces unconventional magnetism in a nanographene",
abstract = "The chemical versatility of carbon imparts manifold properties to organic compounds, where magnetism remains one of the most desirable but elusive1. Polycyclic aromatic hydrocarbons, also referred to as nanographenes, show a critical dependence of electronic structure on the topologies of the edges and the π-electron network, which makes them model systems with which to engineer unconventional properties including magnetism. In 1972, Erich Clar envisioned a bow-tie-shaped nanographene, C38H18 (refs. 2,3), where topological frustration in the π-electron network renders it impossible to assign a classical Kekul{\'e} structure without leaving unpaired electrons, driving the system into a magnetically non-trivial ground state4. Here, we report the experimental realization and in-depth characterization of this emblematic nanographene, known as Clar’s goblet. Scanning tunnelling microscopy and spin excitation spectroscopy of individual molecules on a gold surface reveal a robust antiferromagnetic order with an exchange-coupling strength of 23 meV, exceeding the Landauer limit of minimum energy dissipation at room temperature5. Through atomic manipulation, we realize switching of magnetic ground states in molecules with quenched spins. Our results provide direct evidence of carbon magnetism in a hitherto unrealized class of nanographenes6, and prove a long-predicted paradigm where topological frustration entails unconventional magnetism, with implications for room-temperature carbon-based spintronics7,8.",
author = "Shantanu Mishra and Doreen Beyer and Kristjan Eimre and Kezilebieke Shawulienu and Reinhard Berger and Oliver Gr{\"o}ning and Pignedoli, {Carlo A.} and Klaus M{\"u}llen and Peter Liljeroth and Pascal Ruffieux and Xinliang Feng and Roman Fasel",
note = "| openaire: EC/H2020/785219/EU//GrapheneCore2 | openaire: EC/H2020/696656/EU//GrapheneCore1 | openaire: EC/H2020/819698/EU//T2DCP | openaire: EC/H2020/788185/EU//E-DESIGN",
year = "2019",
month = "12",
day = "9",
doi = "10.1038/s41565-019-0577-9",
language = "English",
volume = "15",
pages = "22–28",
journal = "Nature Nanotechnology",
issn = "1748-3387",
publisher = "Nature Publishing Group",

}

RIS - Lataa

TY - JOUR

T1 - Topological frustration induces unconventional magnetism in a nanographene

AU - Mishra, Shantanu

AU - Beyer, Doreen

AU - Eimre, Kristjan

AU - Shawulienu, Kezilebieke

AU - Berger, Reinhard

AU - Gröning, Oliver

AU - Pignedoli, Carlo A.

AU - Müllen, Klaus

AU - Liljeroth, Peter

AU - Ruffieux, Pascal

AU - Feng, Xinliang

AU - Fasel, Roman

N1 - | openaire: EC/H2020/785219/EU//GrapheneCore2 | openaire: EC/H2020/696656/EU//GrapheneCore1 | openaire: EC/H2020/819698/EU//T2DCP | openaire: EC/H2020/788185/EU//E-DESIGN

PY - 2019/12/9

Y1 - 2019/12/9

N2 - The chemical versatility of carbon imparts manifold properties to organic compounds, where magnetism remains one of the most desirable but elusive1. Polycyclic aromatic hydrocarbons, also referred to as nanographenes, show a critical dependence of electronic structure on the topologies of the edges and the π-electron network, which makes them model systems with which to engineer unconventional properties including magnetism. In 1972, Erich Clar envisioned a bow-tie-shaped nanographene, C38H18 (refs. 2,3), where topological frustration in the π-electron network renders it impossible to assign a classical Kekulé structure without leaving unpaired electrons, driving the system into a magnetically non-trivial ground state4. Here, we report the experimental realization and in-depth characterization of this emblematic nanographene, known as Clar’s goblet. Scanning tunnelling microscopy and spin excitation spectroscopy of individual molecules on a gold surface reveal a robust antiferromagnetic order with an exchange-coupling strength of 23 meV, exceeding the Landauer limit of minimum energy dissipation at room temperature5. Through atomic manipulation, we realize switching of magnetic ground states in molecules with quenched spins. Our results provide direct evidence of carbon magnetism in a hitherto unrealized class of nanographenes6, and prove a long-predicted paradigm where topological frustration entails unconventional magnetism, with implications for room-temperature carbon-based spintronics7,8.

AB - The chemical versatility of carbon imparts manifold properties to organic compounds, where magnetism remains one of the most desirable but elusive1. Polycyclic aromatic hydrocarbons, also referred to as nanographenes, show a critical dependence of electronic structure on the topologies of the edges and the π-electron network, which makes them model systems with which to engineer unconventional properties including magnetism. In 1972, Erich Clar envisioned a bow-tie-shaped nanographene, C38H18 (refs. 2,3), where topological frustration in the π-electron network renders it impossible to assign a classical Kekulé structure without leaving unpaired electrons, driving the system into a magnetically non-trivial ground state4. Here, we report the experimental realization and in-depth characterization of this emblematic nanographene, known as Clar’s goblet. Scanning tunnelling microscopy and spin excitation spectroscopy of individual molecules on a gold surface reveal a robust antiferromagnetic order with an exchange-coupling strength of 23 meV, exceeding the Landauer limit of minimum energy dissipation at room temperature5. Through atomic manipulation, we realize switching of magnetic ground states in molecules with quenched spins. Our results provide direct evidence of carbon magnetism in a hitherto unrealized class of nanographenes6, and prove a long-predicted paradigm where topological frustration entails unconventional magnetism, with implications for room-temperature carbon-based spintronics7,8.

U2 - 10.1038/s41565-019-0577-9

DO - 10.1038/s41565-019-0577-9

M3 - Article

VL - 15

SP - 22

EP - 28

JO - Nature Nanotechnology

JF - Nature Nanotechnology

SN - 1748-3387

ER -

ID: 39323656