2026-04-21T01:46:26Z https://archive.materialscloud.org/oai2d

oai:materialscloud.org:929 2021-10-11T18:20:39Z openaire_data community-mcarchive

Mishra, Shantanu Eimre, Kristjan Ruffieux, Pascal Mishra, Shantanu Catarina, Gonçalo Wu, Fupeng Ortiz, Ricardo Jacob, David Eimre, Kristjan Ma, Ji Pignedoli, Carlo A. Feng, Xinliang Ruffieux, Pascal Fernández-Rossier, Joaquín Fasel, Roman 2021-10-11 Fractionalization is a phenomenon in which strong interactions in a quantum system drive the emergence of excitations with quantum numbers that are absent in the building blocks. Outstanding examples are excitations with charge e/3 in the fractional quantum Hall effect, solitons in one-dimensional conducting polymers and Majorana states in topological superconductors. Fractionalization is also predicted to manifest itself in low-dimensional quantum magnets, such as one-dimensional antiferromagnetic S = 1 chains. The fundamental features of this system are gapped excitations in the bulk and, remarkably, S = 1/2 edge states at the chain termini, leading to a four-fold degenerate ground state that reflects the underlying symmetry-protected topological order. This record contains data to support the result in a recent publication of ours where we use on-surface synthesis to fabricate one-dimensional spin chains that contain the S = 1 polycyclic aromatic hydrocarbon triangulene as the building block. Using scanning tunneling microscopy and spectroscopy at 4.5 K, we probe length-dependent magnetic excitations at the atomic scale in both open-ended and cyclic spin chains, and directly observe gapped spin excitations and fractional edge states therein. Exact diagonalization calculations provide conclusive evidence that the spin chains are described by the S = 1 bilinear-biquadratic Hamiltonian in the Haldane symmetry-protected topological phase. Our results open a bottom-up approach to study strongly correlated phases in purely organic materials, with the potential for the realization of measurement-based quantum computation. application/octet-stream application/gzip application/octet-stream text/markdown https://doi.org/10.24435/materialscloud:e8-aq oai:materialscloud.org:929 mcid:2021.161 eng Materials Cloud https://doi.org/10.1038/s41586-021-03842-3 https://arxiv.org/abs/2105.09102 https://renkulab.io/projects/new?data=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 https://archive.materialscloud.org/communities/mcarchive https://doi.org/10.24435/materialscloud:hp-1a info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode spin chains nanographene fractionalization Graphene flagship MARVEL/DD3 ERC CSCS H2020 SNSF Observation of fractional edge excitations in nanographene spin chains info:eu-repo/semantics/other