Drude Weight, Optical Conductivity of Two-Dimensional Hubbard Model at Half Filling

摘要: We study the Drude weight D and optical conductivity of two-dimensional (2D) Hubbard model at half filling with staggered magnetic flux (SMF). When SMF being introduced, hopping integrals are modulated by flux. The sum rule, which is related to mean kinetic energy band electrons, evaluated for this 2D Hamiltonian. Our present result gives dependence energy, on U. At vanishes exponentially system size. also find in frequency conductivity, there δ-function peak ω ≈ 2|m|U incoherent excitations begin themselves extended a higher region.