Replicas of the Kondo peak due to electron-vibration interaction in molecular transport properties

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

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: New York; Año: 2016 vol. 93 p. 115139 - 115139

1098-0121

The low temperature properties of single level molecular quantum dots including both electron-electron and electron-vibration interactions, are theoretically investigated. The calculated differential conductance in theKondo regime exhibits not only the zero bias anomaly but also side peaks located at bias voltages which coincide with multiples of the energy of vibronic mode V ∼ Omega/e. We obtain that the evolution with temperature of the two main satellite conductance peaks follows the corresponding one of the Kondo peak when Omega >> k B T K , T Kbeing the Kondo temperature, in agreement with recent transport measurements in molecular junctions. However, we find that this is no longer valid when Omega is of the order of a few times k B T K .