The strange metals forcing us to rethink how electricity really works
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- Strange metals defy 70 years of conduction theory by showing a linear resistance-versus-temperature relationship — Joseph Polchinski dubbed the behavior "the conductor from Hell" because no known quasiparticle process can produce that power of the temperature.
- Stephen Hayden at the University of Bristol and colleagues used neutron beams at the UK's Rutherford Appleton Laboratory this year to probe electron-spin fluctuations in a strange metal, finding the fluctuations' pace rises in lockstep with temperature — what the source calls "the strongest evidence to date that critical fluctuations are behind strange-metal behaviour."
- Eric Heller at Harvard argued last year that ordinary atomic vibrations explain strange metals, since copper shows linear resistance at room temperature — but most physicists reject the idea because vibrations are predicted to freeze out at the low temperatures where the anomaly persists.
- Subir Sachdev at Harvard and Jinwu Ye at Mississippi State proposed a deliberately spaceless model in the early 1990s in which every electron connects to every other and electrical disturbances decay at a rate proportional to temperature, with no individual particles doing the work.
- Strange-metal behaviour, once confined to copper-oxide "cuprates," has now been documented in iron pnictides (Louis Taillefer, University of Sherbrooke, 2009), twisted bilayer graphene (Andrea Young, UCSB, and Cory Dean, Columbia, 2019), and nickelates (Harold Hwang, SLAC) — yet theorists still lack a particle-based description of the resistance.
- String theorists' "holography" — the mathematical trick by which everything inside a volume of space is encoded on its boundary, originally used to study black holes — is now being repurposed as a possible bridge to describe strange-metal conductivity without invoking quasiparticles.
Why it matters: The entire electronics industry rests on Lev Landau's 1950s quasiparticle framework. If strange metals' resistance is driven by collective electron patterns rather than individual particle collisions — as the 2025 neutron data, Sachdev's model, and holographic approaches together suggest — that would force a rewrite of fundamental conduction physics and could finally crack high-temperature superconductivity, the 1980s breakthrough whose promised payoff of lossless power transmission remains unrealized.
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