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- Publisher Website: 10.1038/s41567-024-02495-z
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Article: Spectral evidence for Dirac spinons in a kagome lattice antiferromagnet
Title | Spectral evidence for Dirac spinons in a kagome lattice antiferromagnet |
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Authors | |
Issue Date | 9-May-2024 |
Publisher | Springer Nature |
Citation | Nature Physics, 2024, v. 20, n. 7, p. 1097-1102 How to Cite? |
Abstract | Emergent quasiparticles with a Dirac dispersion in condensed matter systems can be described by the Dirac equation for relativistic electrons, in analogy with Dirac particles in high-energy physics. For example, electrons with a Dirac dispersion have been intensively studied in electronic systems such as graphene and topological insulators. However, charge is not a prerequisite for Dirac fermions, and the emergence of Dirac fermions without a charge degree of freedom has been theoretically predicted to be realized in Dirac quantum spin liquids. These quasiparticles carry a spin of 1/2 but are charge-neutral and so are called spinons. Here we show that the spin excitations of a kagome antiferromagnet, YCu3(OD)6Br2[Br0.33(OD)0.67], are conical with a spin continuum inside, which is consistent with the convolution of two Dirac spinons. The predictions of a Dirac spin liquid model with a spinon velocity obtained from spectral measurements are in agreement with the low-temperature specific heat of the sample. Our results, thus, provide spectral evidence for a Dirac quantum spin liquid state emerging in this kagome lattice antiferromagnet. However, the locations of the conical spin excitations differ from those calculated by the nearest-neighbour Heisenberg model, suggesting the Dirac spinons have an unexpected origin. |
Persistent Identifier | http://hdl.handle.net/10722/344314 |
ISSN | 2023 Impact Factor: 17.6 2023 SCImago Journal Rankings: 8.228 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Zeng, Zhenyuan | - |
dc.contributor.author | Zhou, Chengkang | - |
dc.contributor.author | Zhou, Honglin | - |
dc.contributor.author | Han, Lankun | - |
dc.contributor.author | Chi, Runze | - |
dc.contributor.author | Li, Kuo | - |
dc.contributor.author | Kofu, Maiko | - |
dc.contributor.author | Nakajima, Kenji | - |
dc.contributor.author | Wei, Yuan | - |
dc.contributor.author | Zhang, Wenliang | - |
dc.contributor.author | Mazzone, Daniel G | - |
dc.contributor.author | Meng, Zi Yang | - |
dc.contributor.author | Li, Shiliang | - |
dc.date.accessioned | 2024-07-24T13:50:40Z | - |
dc.date.available | 2024-07-24T13:50:40Z | - |
dc.date.issued | 2024-05-09 | - |
dc.identifier.citation | Nature Physics, 2024, v. 20, n. 7, p. 1097-1102 | - |
dc.identifier.issn | 1745-2473 | - |
dc.identifier.uri | http://hdl.handle.net/10722/344314 | - |
dc.description.abstract | <p>Emergent quasiparticles with a Dirac dispersion in condensed matter systems can be described by the Dirac equation for relativistic electrons, in analogy with Dirac particles in high-energy physics. For example, electrons with a Dirac dispersion have been intensively studied in electronic systems such as graphene and topological insulators. However, charge is not a prerequisite for Dirac fermions, and the emergence of Dirac fermions without a charge degree of freedom has been theoretically predicted to be realized in Dirac quantum spin liquids. These quasiparticles carry a spin of 1/2 but are charge-neutral and so are called spinons. Here we show that the spin excitations of a kagome antiferromagnet, YCu<sub>3</sub>(OD)<sub>6</sub>Br<sub>2</sub>[Br<sub>0.33</sub>(OD)<sub>0.67</sub>], are conical with a spin continuum inside, which is consistent with the convolution of two Dirac spinons. The predictions of a Dirac spin liquid model with a spinon velocity obtained from spectral measurements are in agreement with the low-temperature specific heat of the sample. Our results, thus, provide spectral evidence for a Dirac quantum spin liquid state emerging in this kagome lattice antiferromagnet. However, the locations of the conical spin excitations differ from those calculated by the nearest-neighbour Heisenberg model, suggesting the Dirac spinons have an unexpected origin.<br></p> | - |
dc.language | eng | - |
dc.publisher | Springer Nature | - |
dc.relation.ispartof | Nature Physics | - |
dc.title | Spectral evidence for Dirac spinons in a kagome lattice antiferromagnet | - |
dc.type | Article | - |
dc.identifier.doi | 10.1038/s41567-024-02495-z | - |
dc.identifier.scopus | eid_2-s2.0-85192519534 | - |
dc.identifier.volume | 20 | - |
dc.identifier.issue | 7 | - |
dc.identifier.spage | 1097 | - |
dc.identifier.epage | 1102 | - |
dc.identifier.eissn | 1745-2481 | - |
dc.identifier.isi | WOS:001221052200002 | - |
dc.identifier.issnl | 1745-2473 | - |