Interpolative approach for electron-electron and electron-phonon interactions: From the Kondo to the polaronic regime

摘要: We present a theoretical approach to determine the electronic properties of nanoscale systems exhibiting strong electron-electron and electron-phonon interactions coupled metallic electrodes. This is based on an interpolative ansatz for self-energy which becomes exact both in limit weak coupling The method provides generalization previous schemes have been applied purely case extensively. As test we consider single level Anderson-Holstein model. results obtained with are good agreement existing data from Numerical Renormalization Group calculations. also check our by considering electrodes represented few discrete levels can be diagonalized exactly. approximation describes properly transition Kondo regime where dominate polaronic characterized interaction.