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    "story_id": "mp-2026-08-03-014",
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    "headline": "The Topological Edge Also Responded to Strain",
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    "dek": "First-principles calculations predict PbGeH and PbSnH monolayers that combine room-temperature-scale bandgaps with piezoelectricity.",
    "summary": "First-principles calculations predict PbGeH and PbSnH monolayers that combine room-temperature-scale bandgaps with piezoelectricity.",
    "body_text": "Calculations predict quantum-spin-Hall gaps up to 0.314 electron volts and in-plane piezoelectric coefficients of 6.676 and 5.370 picometers per volt for two hydrogenated lead monolayers. A Janus variant also produced an out-of-plane response and a large modeled Rashba parameter while retaining edge states under plus or minus six percent strain. These are theoretical materials predictions, not fabricated devices.",
    "why_it_matters": "First-principles calculations predict PbGeH and PbSnH monolayers that combine room-temperature-scale bandgaps with piezoelectricity.",
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      "These are theoretical materials predictions, not fabricated devices."
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        "text": "First-principles calculations predict PbGeH and PbSnH monolayers that combine room-temperature-scale bandgaps with piezoelectricity.",
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        "qualification": "These are theoretical materials predictions, not fabricated devices."
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    "tags": [
      "topological insulators",
      "piezoelectricity",
      "spintronics"
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    {
      "source_id": "source-2026-08-03-014",
      "title": "2D Materials: piezoelectric topological PbXH monolayers",
      "publisher": "IOP Publishing",
      "url": "https://doi.org/10.1088/2053-1583/ae8ccd",
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    "title": "The Topological Edge Also Responded to Strain",
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