Nonequilibrium transport through magnetic vibrating molecules

P. ROURA-BAS, L. TOSI, AND A. A. ALIGIA

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: New York; Año: 2013 vol. 87 p. 19 - 5136

1098-0121

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 λ 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 TK with λ for fixed renormalized energy of the localized level Ed . The meaning and value of Ed are discussed. The spectral density of localized electrons shows, in addition to the Kondo peak of width 2TK , satellites of this peak shifted by multiples of the phonon frequency ω0 . The nonequilibrium conductance as a function of bias voltage Vb at small temperatures also displays peaks at multiples of ω0 in addition to the central dominant Kondo peak near Vb = 0