Identifying Universal Spin Excitations in Spin-1/2 Kagome Quantum Spin Liquid Materials
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913784649482240 |
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| author | Breidenbach, Aaron T. Campello, Arthur C. Wen, Jiajia Jiang, Hong-Chen Pajerowski, Daniel M. Smaha, Rebecca W. Lee, Young S. |
| author_facet | Breidenbach, Aaron T. Campello, Arthur C. Wen, Jiajia Jiang, Hong-Chen Pajerowski, Daniel M. Smaha, Rebecca W. Lee, Young S. |
| contents | A quantum spin liquid (QSL) is an exotic quantum state of matter characterized by fluctuating spins which may exhibit long-range entanglement. Among the possible host candidates for a QSL ground state, the $S$=1/2 kagome lattice antiferromagnet is particularly promising. Using high resolution inelastic neutron scattering measurements on Zn-barlowite (Zn$_\mathrm{x}$Cu$_\mathrm{4-x}$(OD)$_\mathrm{6}$FBr, $x\simeq 0.80$), we measure a spin excitation spectrum consistent with a QSL ground state. Continuum scattering above $\sim$1 meV matches that of herbertsmithite (Zn$_\mathrm{x}$Cu$_\mathrm{4-x}$(OD)$_6$Cl$_2$, $x\simeq 0.85$), another prominent kagome QSL material, indicating universal spinon excitations. A detailed analysis of the spin-spin correlations, compared with density matrix renormalization group calculations, further indicate a QSL ground state for the physically relevant Hamiltonian parameters. The measured spectra in Zn-barlowite are consistent with gapped behavior with a gap size $Δ= 1.1(2)$ meV. Comparison with a simple pair correlation model allows us to clearly distinguish intrinsic kagome correlations from impurity-induced correlations. Our results clarify the behavior that is universal within this important family of QSL candidate materials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_06491 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Identifying Universal Spin Excitations in Spin-1/2 Kagome Quantum Spin Liquid Materials Breidenbach, Aaron T. Campello, Arthur C. Wen, Jiajia Jiang, Hong-Chen Pajerowski, Daniel M. Smaha, Rebecca W. Lee, Young S. Strongly Correlated Electrons A quantum spin liquid (QSL) is an exotic quantum state of matter characterized by fluctuating spins which may exhibit long-range entanglement. Among the possible host candidates for a QSL ground state, the $S$=1/2 kagome lattice antiferromagnet is particularly promising. Using high resolution inelastic neutron scattering measurements on Zn-barlowite (Zn$_\mathrm{x}$Cu$_\mathrm{4-x}$(OD)$_\mathrm{6}$FBr, $x\simeq 0.80$), we measure a spin excitation spectrum consistent with a QSL ground state. Continuum scattering above $\sim$1 meV matches that of herbertsmithite (Zn$_\mathrm{x}$Cu$_\mathrm{4-x}$(OD)$_6$Cl$_2$, $x\simeq 0.85$), another prominent kagome QSL material, indicating universal spinon excitations. A detailed analysis of the spin-spin correlations, compared with density matrix renormalization group calculations, further indicate a QSL ground state for the physically relevant Hamiltonian parameters. The measured spectra in Zn-barlowite are consistent with gapped behavior with a gap size $Δ= 1.1(2)$ meV. Comparison with a simple pair correlation model allows us to clearly distinguish intrinsic kagome correlations from impurity-induced correlations. Our results clarify the behavior that is universal within this important family of QSL candidate materials. |
| title | Identifying Universal Spin Excitations in Spin-1/2 Kagome Quantum Spin Liquid Materials |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2504.06491 |