We study the Drude weight D and optical conductivity of the two-dimensional (2D) Hubbard model athalf filling with staggered magnetic flux (SMF).When SMF being introduced,the hopping integrals are modulated bythe magn...We study the Drude weight D and optical conductivity of the two-dimensional (2D) Hubbard model athalf filling with staggered magnetic flux (SMF).When SMF being introduced,the hopping integrals are modulated bythe magnetic flux.The optical sum rule,which is related to the mean kinetic energy of band electrons,is evaluatedfor this 2D Hubbard Hamiltonian.Our present result gives the dependence of the kinetic energy,D and the opticalconductivity on SMF and U.At half filling D vanishes exponentially with system size.We also find in the frequencydependence of the optical conductivity,there is 6-function peak at ω≈2|m|U and the incoherent excitations begin topresent themselves extended to a higher energy region.展开更多
基金National Natural Science Foundation of China under Grant No.10247010the Foundation for Key Program of Ministry of Education of China under Grant No.205181
文摘We study the Drude weight D and optical conductivity of the two-dimensional (2D) Hubbard model athalf filling with staggered magnetic flux (SMF).When SMF being introduced,the hopping integrals are modulated bythe magnetic flux.The optical sum rule,which is related to the mean kinetic energy of band electrons,is evaluatedfor this 2D Hubbard Hamiltonian.Our present result gives the dependence of the kinetic energy,D and the opticalconductivity on SMF and U.At half filling D vanishes exponentially with system size.We also find in the frequencydependence of the optical conductivity,there is 6-function peak at ω≈2|m|U and the incoherent excitations begin topresent themselves extended to a higher energy region.
基金The project supported by National Natural Science Foundation of China under Grant No. 10247010 and the Foundation for Key Program of Ministry of Education under Grant No. 205181