GoKawiilResearchers detail anomalous metal and superconducting states in rhombohedral graphene device
Scientists studying a rhombohedral graphene device mapped two distinct electronic phases—an anomalous metal (AM) state and a superconducting (SC) state—by measuring resistance across varying gate voltages, magnetic fields, temperatures and currents. Using multiple voltage probe pairs on a second device, they found the SC and AM regions occupy consistent boundaries in the phase diagram, matching results from an earlier primary device, though the absolute resistance values differed between contact pairs.
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Confirming that these two exotic phases appear at consistent parameter boundaries across different devices and measurement configurations strengthens the case that they reflect intrinsic physics of rhombohedral graphene rather than device-specific artifacts. This kind of reproducibility is often a prerequisite for researchers to pursue theoretical explanations of unconventional superconductivity and metallic behavior in graphene-based systems, potentially informing future work on correlated electron phases in layered materials.
- A second graphene device reproduced both anomalous metal and superconducting resistance pockets seen in an earlier device.
- The Hall resistance was finite in the anomalous metal region but tended toward zero in the superconducting region.
- Boundaries of the two phases were consistent across different contact pairs, though measured resistance magnitudes varied.
Source: nature.com — Okounkova, 2026-09-23
Published there as: “Anomalous metal and superconducting phases in rhombohedral graphene”
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