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    "headline": "Two Colors of Light Aim an Electron Beam",
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    "dek": "A semiconductor device steers current without an applied electric field by rotating the polarization of phase-coherent light.",
    "summary": "A semiconductor device steers current without an applied electric field by rotating the polarization of phase-coherent light.",
    "body_text": "University of Michigan researchers built a semiconductor device in which two colors of light drive competing quantum absorption paths. By rotating the optical fields' polarization, the team directed a narrow electron current like a lighthouse beam without applying an electric field. The Physical Review Letters result demonstrates a previously predicted effect and may inform sensing or communications research, but it is not a finished optical-electronic product.",
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    "tags": [
      "quantum interference",
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      "source_id": "source-2026-07-22-012",
      "title": "University of Michigan via Newswise: Electron lighthouse",
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    "title": "Two Colors of Light Aim an Electron Beam",
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