Microscopic quantum fluctuations near the metal-insulator transition point have been uncovered in numerical simulations, providing insight into the challenges involved in the theoretical description of Mott insulators.
Mott insulators exhibit a drastic electron system change associated with the insulator-metal transition. Near what is known as the Mott transition, extraordinary phenomena like high-temperature superconductivity and colossal magnetoresistance arise from the interplay among charge and spin.
Further details: Mott insulators ─ exotica inside crystals