Nonequilibrium transport through magnetic vibrating molecules

作者：Roura Bas P^*; Tosi L; Aligia A A

来源：Physical Review B, 2013, 87(19): 195136.

DOI：10.1103/PhysRevB.87.195136

We calculate the nonequilibrium conductance through a molecule or a quantum dot in which the occupation of the relevant electronic level is coupled with intensity lambda to a phonon mode and also to two conducting leads. The system is described by the Anderson-Holstein Hamiltonian. We solve the problem using the Keldysh formalism and the noncrossing approximation for both the electron-electron and the electron-phonon interactions. We obtain a moderate decrease of the Kondo temperature T-K with lambda for fixed renormalized energy of the localized level (E) over tilde (d). The meaning and value of (E) over tilde (d) are discussed. The spectral density of localized electrons shows, in addition to the Kondo peak of width 2T(K), satellites of this peak shifted by multiples of the phonon frequency omega(0). The nonequilibrium conductance as a function of bias voltage V-b at small temperatures also displays peaks at multiples of omega(0) in addition to the central dominant Kondo peak near V-b = 0.

• 出版日期2013-5-28