Scholarlink

<p>A quantum spin liquid is an exotic quantum state of matter characterized by fluctuating spins that may exhibit long-range entanglement. Among the possible host candidates for a quantum spin liquid ground state, the <i>S</i> = 1/2 kagome lattice antiferromagnet is particularly promising. Here we measure a spin excitation spectrum consistent with a quantum spin liquid using high-resolution inelastic neutron scattering measurements on Zn-barlowite (Zn<sub><i>x</i></sub>Cu<sub>4−<i>x</i></sub>(OD)<sub>6</sub>FBr, <i>x</i> ≃ 0.80). We observe continuum scattering that matches earlier observations in herbertsmithite (Zn<sub><i>x</i></sub>Cu<sub>4−<i>x</i></sub>(OD)<sub>6</sub>Cl<sub>2</sub>, <i>x</i> ≃ 0.85), another prominent kagome quantum spin liquid candidate, which could represent a universal scattering process from spinon excitations. A detailed analysis of the spin–spin correlations, compared with density matrix renormalization group calculations with physically relevant Hamiltonian parameters, further indicates that the ground state is a quantum spin liquid. The measured spectra in Zn-barlowite are consistent with gapped behaviour. Comparison with a simple pair correlation model allows us to clearly distinguish intrinsic kagome correlations from impurity-induced correlations. Our results identify potential universal behaviour within this important family of quantum spin liquid candidate materials.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Identifying universal spin excitations in candidate spin-1/2 kagome quantum spin liquid materials

  • 期刊论文

  • 发表日期：

    2025年10月31日

查看全文
  • Aaron T. Breidenbach,
  • Arthur C. Campello,
  • Jiajia Wen,
  • Hong-Chen Jiang,
  • Daniel M. Pajerowski,
  • Rebecca W. Smaha,
  • Young S. Lee

摘要

A quantum spin liquid is an exotic quantum state of matter characterized by fluctuating spins that may exhibit long-range entanglement. Among the possible host candidates for a quantum spin liquid ground state, the S = 1/2 kagome lattice antiferromagnet is particularly promising. Here we measure a spin excitation spectrum consistent with a quantum spin liquid using high-resolution inelastic neutron scattering measurements on Zn-barlowite (ZnxCu4−x(OD)6FBr, x ≃ 0.80). We observe continuum scattering that matches earlier observations in herbertsmithite (ZnxCu4−x(OD)6Cl2, x ≃ 0.85), another prominent kagome quantum spin liquid candidate, which could represent a universal scattering process from spinon excitations. A detailed analysis of the spin–spin correlations, compared with density matrix renormalization group calculations with physically relevant Hamiltonian parameters, further indicates that the ground state is a quantum spin liquid. The measured spectra in Zn-barlowite are consistent with gapped behaviour. Comparison with a simple pair correlation model allows us to clearly distinguish intrinsic kagome correlations from impurity-induced correlations. Our results identify potential universal behaviour within this important family of quantum spin liquid candidate materials.