Geometrical frustration effects on charge-driven quantum phase transitions
Geometrical frustration effects on charge-driven quantum phase transitions
The interplay of Coulomb repulsion and geometrical frustration on charge-driven quantum phase transitions is explored. The ground-state phase diagram of an extended Hubbard model on an anisotropic triangular lattice relevant to quarter-filled layered organic materials contains homogeneous metal, ``pinball,'' and threefold charge ordered metallic phases. The stability of the pinball …