Charge dynamics in doped Mott insulators on a honeycomb lattice

Abstract

Within the framework of the fermion-spin theory, the charge transport in the doped Mott insulators on a honeycomb lattice is studied by taking into account the pseudogap effect. It is shown that the conductivity spectrum in the low-doped regime is separated by the pseudogap into a low-energy non-Drude peak followed by a broad midinfrared band. However, the decrease of the pseudogap with the increase of doping leads to a shift of the position of the midinfrared band towards to the low-energy non-Drude peak, and then the low-energy Drude behavior recovers in the high-doped regime. The combined results of both the doped honeycomb-lattice and square-lattice Mott insulators indicate that the two-component conductivity induced by the pseudogap is a universal feature in the doped Mott insulators.

8 pages, 3 figures

References in corpus (11)

• The pseudogap in high-temperature superconductors: an experimental survey
• Two Gaps Make a High Temperature Superconductor?
• Absence of a Spin Liquid Phase in the Hubbard Model on the Honeycomb Lattice
• Chiral d-wave superconductivity in doped graphene
• Mottness: Identifying the Propagating Charge Modes in doped Mott Insulators
• Novel spin-liquid states in the frustrated Heisenberg antiferromagnet on the honeycomb lattice
• Kinetic-energy driven superconductivity in cuprate superconductors
• CaMn${}_2$Sb${}_2$: Spin waves on a frustrated antiferromagnetic honeycomb lattice
• Magnetic properties in the doped spin-1/2 honeycomb-lattice compound In${}_3$Cu${}_2$VO${}_9$
• Excitonic and superconducting orders from repulsive interaction on the doped honeycomb bilayer
• Quantum phases of the frustrated XY models on the honeycomb lattice