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<p>Mott physics lies at the heart of many intriguing quantum phenomena. Recently, van der Waals materials emerge as a powerful platform to explore these correlated electronic states, yet tracking how such a Mott state develops and interacts with neighboring phases remains an experimental challenge. Here we use scanning tunnelling spectroscopy to study a filling-controlled Mott state and its interplay with superconductivity in 4Hb-TaS<sub>2</sub>, which interleaves strongly correlated 1T-TaS<sub>2</sub> layers and superconducting 1H-TaS<sub>2</sub> layers. By resolving the electronic spectral function across different filling levels driven by interlayer charge transfer, we quantitatively capture the continuous evolution of the Mott state, characterized by the emergence of Mott-Hubbard bands and the systematic suppression of the central quasiparticle peak. Moreover, while the 1H layers exhibit a uniform, fully opened superconducting gap, the heavily correlated electrons in the 1T layers act destructively against pairing, creating nanoscale, non-superconducting paramagnetic puddles. Our findings provide a quintessential visualization of the iconic Hubbard model and establish layered heterostructures as an ideal playground for designing exotic correlated quantum phases.</p>

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Unveiling the landscape of Mottness and its proximity to superconductivity in 4Hb-TaS2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月8日

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  • Ping Wu,
  • Zhuying Wang,
  • Yunmei Zhang,
  • Ziyan Chen,
  • Wanru Ma,
  • Shuikang Yu,
  • Yitian Ma,
  • Min Shan,
  • Zeyu Liang,
  • Xiaoyu Wei,
  • Junzhe Wang,
  • Wanlin Cheng,
  • Zuowei Liang,
  • Xuechen Zhang,
  • Tao Wu,
  • Yoshinari Okada,
  • Kun Jiang,
  • Zhenyu Wang,
  • Xianhui Chen

摘要

Mott physics lies at the heart of many intriguing quantum phenomena. Recently, van der Waals materials emerge as a powerful platform to explore these correlated electronic states, yet tracking how such a Mott state develops and interacts with neighboring phases remains an experimental challenge. Here we use scanning tunnelling spectroscopy to study a filling-controlled Mott state and its interplay with superconductivity in 4Hb-TaS2, which interleaves strongly correlated 1T-TaS2 layers and superconducting 1H-TaS2 layers. By resolving the electronic spectral function across different filling levels driven by interlayer charge transfer, we quantitatively capture the continuous evolution of the Mott state, characterized by the emergence of Mott-Hubbard bands and the systematic suppression of the central quasiparticle peak. Moreover, while the 1H layers exhibit a uniform, fully opened superconducting gap, the heavily correlated electrons in the 1T layers act destructively against pairing, creating nanoscale, non-superconducting paramagnetic puddles. Our findings provide a quintessential visualization of the iconic Hubbard model and establish layered heterostructures as an ideal playground for designing exotic correlated quantum phases.