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<p>In homo- or hetero-interface of two dimensional materials, beyond the rigid moiré patterns, the marginal twisting ensures local commensurate stacking registry via reconstruction and thus introduces versatile structural subtleties into the many-body interplay, enabling the coexistence and tessellation of multiple domain-specific emergent states. In this work, we demonstrate that monolayer <i>1T</i>-TiSe<sub>2</sub> epitaxially grown on <i>2H</i>-NbSe<sub>2</sub> undergoes spontaneous moiré reconstruction, therein developing distinct charge density wave configurations dictated by stacking orientation. In parallel-stacked regions, the native 2×2 charge order of TiSe<sub>2</sub> persists but experiences domain-selective modulation. Antiparallel-stacked systems host distinctive <InlineEquation ID="IEq1"><EquationSource Format="TEX">\(\sqrt{3}\times \sqrt{3}\)</EquationSource><EquationSource Format="MATHML"><math><msqrt><mrow><mn>3</mn></mrow></msqrt><mo>×</mo><msqrt><mrow><mn>3</mn></mrow></msqrt></math></EquationSource></InlineEquation> and 2×1 charge orders which exhibit intertwined phenomena unveiled by scanning tunneling microscopy—including bias-toggled negative differential conductance, competitive inter-order penetration, and defect-mediated local ordering reconstitution. These observations coalesce into a unified paradigm, where the <InlineEquation ID="IEq2"><EquationSource Format="TEX">\(\sqrt{3}\times \sqrt{3}\)</EquationSource><EquationSource Format="MATHML"><math><msqrt><mrow><mn>3</mn></mrow></msqrt><mo>×</mo><msqrt><mrow><mn>3</mn></mrow></msqrt></math></EquationSource></InlineEquation> charge order is quantum confined and isolated in single domain, while the 2×1 charge order permeates across domains, forming a percolative network. Our results demonstrate that the marginal-twist moiré reconstruction is a designer platform to generate rich emergent charge density wave landscapes, which also serves as a nanoscale testbed to decipher their disparate microscopic nature.</p>

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Coexistence of percolative and quantum-confined charge orders in marginally twisted TiSe2/NbSe2 heterostructure

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月1日

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  • Lingke Xu,
  • Yaozhenghang Ma,
  • Run Wen,
  • Qidong Sun,
  • Shengru Zhang,
  • Hua Wu,
  • Zhongjie Wang,
  • Chunlei Gao

摘要

In homo- or hetero-interface of two dimensional materials, beyond the rigid moiré patterns, the marginal twisting ensures local commensurate stacking registry via reconstruction and thus introduces versatile structural subtleties into the many-body interplay, enabling the coexistence and tessellation of multiple domain-specific emergent states. In this work, we demonstrate that monolayer 1T-TiSe2 epitaxially grown on 2H-NbSe2 undergoes spontaneous moiré reconstruction, therein developing distinct charge density wave configurations dictated by stacking orientation. In parallel-stacked regions, the native 2×2 charge order of TiSe2 persists but experiences domain-selective modulation. Antiparallel-stacked systems host distinctive \(\sqrt{3}\times \sqrt{3}\)3×3 and 2×1 charge orders which exhibit intertwined phenomena unveiled by scanning tunneling microscopy—including bias-toggled negative differential conductance, competitive inter-order penetration, and defect-mediated local ordering reconstitution. These observations coalesce into a unified paradigm, where the \(\sqrt{3}\times \sqrt{3}\)3×3 charge order is quantum confined and isolated in single domain, while the 2×1 charge order permeates across domains, forming a percolative network. Our results demonstrate that the marginal-twist moiré reconstruction is a designer platform to generate rich emergent charge density wave landscapes, which also serves as a nanoscale testbed to decipher their disparate microscopic nature.