What happens deep inside Earth is actually being controlled by a tiny 'quantum revolution' happening inside individual iron atoms.
March 24, 2026
Original Paper
A quiet quantum revolution in Earth's deep interior
arXiv · 2603.20812
The Takeaway
Under the crushing pressure of the Earth's mantle, iron atoms undergo a 'spin crossover' where their electrons rearrange themselves into a more compact state. This tiny quantum change is so pervasive that it alters the speed of seismic waves across the entire planet, explaining geological mysteries that classical physics couldn't solve.
From the abstract
The Earth's lower mantle hosts a subtle but pervasive quantum phenomenon: the pressure-induced spin crossover of iron in its dominant minerals, bridgmanite and ferropericlase. In this transition, iron ions gradually shift from high-spin to low-spin electronic states without structural change, altering their volume, compressibility, and elastic properties. Although long recognized experimentally and theoretically, its geophysical significance has only recently become clear through the integration