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<p>Two-dimensional honeycomb antiferromagnets are promising materials class for realizing Kitaev quantum spin liquids. The signature of these materials includes anisotropic bond-dependent magnetic responses and persistent fluctuations in paramagnetic regime. Here, we propose Cu<sub>3</sub>Co<sub>2</sub>SbO<sub>6</sub> heterostructures as an intriguing candidate, wherein bond-dependent and frustrated spins interact with optical excitons. First-principles spin Hamiltonian calculations and in-plane anisotropic critical fields suggest strong frustration and dominant Kitaev exchange interactions. Optical spectroscopy reveals exciton coupled to frustrated magnetism, enabling optical detection of spin states. Spin-exciton coupling displays anisotropic responses to light polarization along the bond-parallel and the bond-perpendicular directions, highlighting Kitaev interactions and persistent short-range spin correlations above twice the Néel temperatures. The robustness of short-range spin fluctuations under magnetic fields underscores the stability of the spin-fluctuation region. Our results establish Cu<sub>3</sub>Co<sub>2</sub>SbO<sub>6</sub> as an attractive candidate for exploring quantum spin liquid, where the spin Hamiltonian and quasiparticle excitations can be probed and potentially controlled by light.</p>

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Optical detection of bond-dependent and frustrated spin in the two-dimensional cobalt-based honeycomb antiferromagnet Cu3Co2SbO6

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月3日

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  • Baekjune Kang,
  • Uksam Choi,
  • Taek Sun Jung,
  • Seunghyeon Noh,
  • Gye-Hyeon Kim,
  • Uihyeon Seo,
  • Miju Park,
  • Jin-Hyun Choi,
  • Min Jae Kim,
  • GwangCheol Ji,
  • Sehwan Song,
  • Hyesung Jo,
  • Seokjo Hong,
  • Nguyen Xuan Duong,
  • Subhasis Samanta,
  • Heung-Sik Kim,
  • Tae Heon Kim,
  • Yongsoo Yang,
  • Sungkyun Park,
  • Jong Mok Ok,
  • Jung-Woo Yoo,
  • Jae Hoon Kim,
  • Changhee Sohn

摘要

Two-dimensional honeycomb antiferromagnets are promising materials class for realizing Kitaev quantum spin liquids. The signature of these materials includes anisotropic bond-dependent magnetic responses and persistent fluctuations in paramagnetic regime. Here, we propose Cu3Co2SbO6 heterostructures as an intriguing candidate, wherein bond-dependent and frustrated spins interact with optical excitons. First-principles spin Hamiltonian calculations and in-plane anisotropic critical fields suggest strong frustration and dominant Kitaev exchange interactions. Optical spectroscopy reveals exciton coupled to frustrated magnetism, enabling optical detection of spin states. Spin-exciton coupling displays anisotropic responses to light polarization along the bond-parallel and the bond-perpendicular directions, highlighting Kitaev interactions and persistent short-range spin correlations above twice the Néel temperatures. The robustness of short-range spin fluctuations under magnetic fields underscores the stability of the spin-fluctuation region. Our results establish Cu3Co2SbO6 as an attractive candidate for exploring quantum spin liquid, where the spin Hamiltonian and quasiparticle excitations can be probed and potentially controlled by light.