There are long-standing ideas and experiments concerning the emergence of unconventional quasiparticles in strongly interacting Fermi systems. The most dramatic are the fractional states originally observed for the two-dimensional electron gases in semiconductor heterostructures subjected to perpendicular magnetic fields, and explained shortly thereafter by Laughlin. Others found in zero field...
Flat bands emerge in a diverse array of materials, spanning twisted heterostructures and compounds with geometrically-frustrated lattices. They feature strong correlations as well as non-trivial topology. Recent experiments on kagome and pyrochlore metals have uncovered a rich variety of strong-correlation phenomena [1], and the 2024 discovery of superconductivity in TMD moiré systems has...
