Electrons effectively interact with other electrons in an electron liquid, and various measurement schemes have yielded results in qualitative agreement with theory. However, in systems where the inter-electron spacing is equal to or larger than the Bohr radius, experiments display surprising results.
Measurements show that electrons can segregate themselves into multiple separate puddles.
Upon raising the electron density beyond a critical density, the same in all samples, these pairing effects suddenly disappear. Additionally, in all samples, the critical density increases with increasing applied magnetic field, nearly doubling at 10 Tesla.