Band structure and density of states in FeAs-based superconductors

[摘要] The generalized quantum Monte Carlo algorithm was used to obtain one-particle excitation spectrum and electron density of states for two-dimensional FeAs-clusters modeling iron-based superconductors within the limits of the full two-orbital model. The calculations were performed for clusters with sizes up to 10x10 FeAs-cells. The excitation spectra were reconstructed from Matsubara Green's function. The spectral density of states and the total density of states near the Fermi level were obtained. The data are in accordance with known experimental results. The influence of the cluster size, temperature, and the interaction strength on the density of states was analysed.

[发布机构] National Research Nuclear University MEPhI, Moscow Engineering Physics Institute), 31 Kashirskoye shosse, Moscow; 115409, Russia^1

[效力级别] 数学

[关键词] Density of state;Excitation spectrum;Fe-As based superconductors;Interaction strength;Particle excitations;Quantum monte carlo;Total density of state;Two-orbital models