ABSTRACT
This chapter looks at the critical behavior of the Mott transition organic conductors, which are superior model materials for the Mott physics. To investigate the Mott transition experimentally particularly to look into the criticality of the Mott transition, one needs real materials with half-filled bands of controllable widths in the vicinity of the Mott transition. For the case of the quantum-critical phenomena of the Mott transition, competing energies are on-site Coulomb repulsion energy U and bandwidth W. A different theoretical argument on the unconventional criticality was made by Imada et al., who focused on the topological nature of the Mott transition, namely the existence or absence of Fermi surfaces, and developed the notion of a marginal quantum criticality for the Mott transition. In the vicinity of the Mott transition, at temperatures sufficiently lower than the critical point, different kinds of phases emerge, such as antiferromagnetic Mott insulators, quantum spin liquids, Fermi liquids, and unconventional superconductors.
