Two Sheets of Carbon, One Tiny Twist, and Suddenly Electricity Flows for Free

Two layers of carbon. Stack them. Rotate one by just a fraction of a degree. What you get is not what you expect, which, in physics, is usually the beginning of something interesting.

Researchers at Ohio State University have found evidence that superconductivity can be controlled by changing a material's surrounding environment. When cooled past a critical threshold, superconducting materials carry electrical current without losing any energy to resistance. For power grids, quantum computers and the long-suffering efficiency of ordinary electronics, that would matter quite a lot.

Led by physicist Chun Ning (Jeanie) Lau, the team worked with twisted bilayer graphene — two layers of carbon stacked and rotated at a small angle — and attached it to a synthetic compound called strontium titanate, which let them observe and control how strongly electrons in the system interacted with each other.

Here is the part that earned the double-take: in conventional superconductors, suppressing repulsion between electrons strengthens their pairing. In twisted bilayer graphene, more interaction produced less superconductivity. The expected relationship runs backward. Even after decades of study, the underlying mechanisms of superconductivity remain poorly understood.

What the team demonstrated is that the switch exists and that the environment around a material is as consequential as the material itself. Carefully chosen substrates and gate stacks can serve as external controls to stabilize or quench superconductivity, opening a new path toward designing superconducting materials and devices.

Carbon has a property whose rules reverse depending on how you look at it. Physicists will feel right at home.

Read the full story at ScienceDaily, May 29, 2026

Hot Take:Four and a half billion years of a planet quietly conducting itself, and we still cannot reliably predict what two sheets of carbon will do when you turn one slightly.