{
  "id": 9415712,
  "title": "Graphene measurements reveal energy-loss and quantum-coherence exponents diverge under gate control",
  "url": "https://urgent.news/2026/09/23/graphene-measurements-reveal-energy-loss-and-quantum-coherence",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-23T21:20:04.000Z",
  "source": {
    "name": "Phys.org",
    "slug": "phys-org",
    "url": "https://phys.org/news/2026-09-graphene-reveal-energy-loss-quantum.html"
  },
  "original_language": "en",
  "account": "Scientists have discovered that the exponents used to describe electron scattering and quantum coherence in graphene behave differently, challenging long-held assumptions. Led by Dr. Wei-Chen Lin at National Taiwan University, a team of researchers analyzed gated epitaxial graphene to independently measure the inelastic scattering exponent and dephasing exponent. At zero gate voltage, these exponents were found to be distinct—p ≈ 2 and p ≈ 1, respectively. As the gate voltage increased, the exponents evolved in opposite directions: p rose from 2 to 3, while the dephasing exponent decreased from 1 to around 0.75. These contrasting trends indicate that energy relaxation and loss of quantum coherence can be governed by different microscopic processes. Understanding these distinct behaviors is crucial for low-temperature quantum transport studies and developing devices that rely on maintaining electronic coherence.",
  "summary": "Scientists have shown that the two exponents (inelastic scattering exponent and dephasing exponent) commonly used to describe electron scattering in graphene do not necessarily follow the same behavior. Using gated epitaxial graphene, a multi-institutional team of researchers independently extracted the two exponents through current-heating measurements and weak-localization analysis. The…",
  "key_points": [
    "Exponents for electron scattering and quantum coherence differ in graphene.",
    "At zero gate voltage, scattering exponent ≈ 2, dephasing exponent ≈ 1.",
    "Gate voltage alters exponents oppositely: scattering rises to 3, dephasing falls to ~0.75."
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}