We study the extended Hubbard model on the triangular lattice as a function of filling and interaction strength. The complex interplay of kinetic frustration and strong interactions on the triangular lattice leads to exotic phases where long-range charge order, antiferromagnetic order, and metallic conductivity can coexist. Variational Monte Carlo simulations show that three kinds of ordered metallic states are stable as a function of nearest neighbor interaction and filling. The coexistence of conductivity and order is explained by a separation into two functional classes of particles: part of them contributes to the stable order, while the other part forms a partially filled band on the remaining substructure. The relation to charge ordering in charge transfer salts is discussed.
|Titolo:||Phase Diagram of the Triangular Extended Hubbard Model|
|Autori:||Tocchio L.; Gros C.; Zhang X. F.; Eggert S.|
|Rivista:||PHYSICAL REVIEW LETTERS|
|Data di pubblicazione:||2014|
|Digital Object Identifier (DOI):||10.1103/PhysRevLett.113.246405|
|Appare nelle tipologie:||1.1 Journal article|