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<p>Strong electronic correlations often give rise to singular phenomena, such as strange metallicity, which appears in various quantum materials platforms. Understanding the mechanisms behind this universality remains an outstanding challenge, especially because the underlying degrees of freedom can be highly complex and varied. Flat-band systems—especially kagome metals—provide an ideal setting for investigating these properties. Here we demonstrate a pronounced zero-bias peak–dip structure in the kagome metal Ni<sub>3</sub>In, in which the kagome flat band lies close to the Fermi energy. Scanning tunnelling spectroscopy reveals that the magnetic field and temperature evolution of these spectral features closely tracks the behaviour of the strange-metal state. We identify the origin of the zero-bias peak arising from compact molecular orbitals formed through destructive quantum interference across the kagome sites. This mechanism gives rise to emergent, <i>f</i>-shell-like localized moments within a <i>d</i> electron-based kagome metal, a manifestation of orbital-driven localization. Spectroscopic imaging further unveils the collapse of these quasiparticles across the Brillouin zone. Therefore, our findings provide insight into how different microscopic building blocks can become interconnected across seemingly disparate families of quantum materials and shed light on the universal nature of strange metallicity and correlated electron behaviour.</p>

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Origin of strange metallicity in a d-orbital kagome metal

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月17日

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  • Jean C. Souza,
  • Moshe Haim,
  • Ambikesh Gupta,
  • Mounica Mahankali,
  • Fang Xie,
  • Yuan Fang,
  • Lei Chen,
  • Shiang Fang,
  • Hengxin Tan,
  • Minyong Han,
  • Caolan John,
  • Jingxu Zheng,
  • Yiwen Liu,
  • Binghai Yan,
  • Joseph G. Checkelsky,
  • Qimiao Si,
  • Nurit Avraham,
  • Haim Beidenkopf

摘要

Strong electronic correlations often give rise to singular phenomena, such as strange metallicity, which appears in various quantum materials platforms. Understanding the mechanisms behind this universality remains an outstanding challenge, especially because the underlying degrees of freedom can be highly complex and varied. Flat-band systems—especially kagome metals—provide an ideal setting for investigating these properties. Here we demonstrate a pronounced zero-bias peak–dip structure in the kagome metal Ni3In, in which the kagome flat band lies close to the Fermi energy. Scanning tunnelling spectroscopy reveals that the magnetic field and temperature evolution of these spectral features closely tracks the behaviour of the strange-metal state. We identify the origin of the zero-bias peak arising from compact molecular orbitals formed through destructive quantum interference across the kagome sites. This mechanism gives rise to emergent, f-shell-like localized moments within a d electron-based kagome metal, a manifestation of orbital-driven localization. Spectroscopic imaging further unveils the collapse of these quasiparticles across the Brillouin zone. Therefore, our findings provide insight into how different microscopic building blocks can become interconnected across seemingly disparate families of quantum materials and shed light on the universal nature of strange metallicity and correlated electron behaviour.