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    "title": "Local imaging of insulating bulk and conducting fractional-Chern edges",
    "summary": "Ji and colleagues used exciton-resonant microwave impedance microscopy to image a dual-gated twisted MoTe2 device at zero magnetic field. Near fillings −2/3 and −3/5, spatial maps showed a suppressed bulk response surrounded by enhanced edge response, supporting the expected bulk–edge structure of fractional Chern insulators. A light-activated monolayer WS2 top gate enabled microwave access while retaining electrostatic control. Density and displacement-field scans followed the evolution between bulk-insulating, edge-enhanced and metallic regimes.",
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        "description": "This record follows the April 2024 preprint. Microwave admittance provides a local conductivity/compressibility proxy with model-dependent response, rather than a direct measurement of quantized Hall conductance or quasiparticle charge. The approximately 500 nm edge-response width can reflect collective magnetoplasmons and is not the microscopic electronic edge width. Filling assignments, gating disorder and selected device regions matter. Neighboring fractional-state domains did not demonstrate controlled anyon braiding, non-Abelian excitations or a universally protected interface.",
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      "statement": "# Local imaging of insulating bulk and conducting fractional-Chern edges\n\nJi and colleagues used exciton-resonant microwave impedance microscopy to image a dual-gated twisted MoTe2 device at zero magnetic field. Near fillings −2/3 and −3/5, spatial maps showed a suppressed bulk response surrounded by enhanced edge response, supporting the expected bulk–edge structure of fractional Chern insulators. A light-activated monolayer WS2 top gate enabled microwave access while retaining electrostatic control. Density and displacement-field scans followed the evolution between bulk-insulating, edge-enhanced and metallic regimes.\n\n## Scientific scope\n\nThis record follows the April 2024 preprint. Microwave admittance provides a local conductivity/compressibility proxy with model-dependent response, rather than a direct measurement of quantized Hall conductance or quasiparticle charge. The approximately 500 nm edge-response width can reflect collective magnetoplasmons and is not the microscopic electronic edge width. Filling assignments, gating disorder and selected device regions matter. Neighboring fractional-state domains did not demonstrate controlled anyon braiding, non-Abelian excitations or a universally protected interface.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nZhurun Ji; Heonjoon Park; Mark E. Barber; Chaowei Hu; Kenji Watanabe; Takashi Taniguchi; Jiun-Haw Chu; Xiaodong Xu; Zhi-xun Shen\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Local probe of bulk and edge states in a fractional Chern insulator (arXiv2404.07157v1)](https://arxiv.org/pdf/2404.07157v1)\n",
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    "what_changed": "Ji and colleagues used exciton-resonant microwave impedance microscopy to image a dual-gated twisted MoTe2 device at zero magnetic field. Near fillings −2/3 and −3/5, spatial maps showed a suppressed bulk response surrounded by enhanced edge response, supporting the expected bulk–edge structure of fractional Chern insulators. A light-activated monolayer WS2 top gate enabled microwave access while retaining electrostatic control. Density and displacement-field scans followed the evolution between bulk-insulating, edge-enhanced and metallic regimes.",
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