Physicists watch a material’s electrons assemble, and reassemble, into coexisting phases

Picture a glass of ice water—solid and liquid coexisting. That duality of phases can happen in quantum materials too, but far more exotically. MIT physicists have now directly observed how two different electron phases emerge and coexist inside a single rare-earth material, erbium tritelluride. The surprise: the first phase appears gradually and uniformly, following what textbooks predict. The second phase reorganizes entirely differently—emerging in isolated pockets that expand, much like water freezing into ice. MIT News reports that researchers used laser pulses to disturb these phases and watched them recover, revealing that the two coexisting phases follow completely different rules. Understanding these mechanisms could help engineers design high-performance quantum devices and explain why some materials simultaneously host superconductivity and other exotic electronic properties.

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