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Abstract
We use the scattering states numerical renormalization group (SNRG) approach to calculate the current I(V) through a single molecular level coupled to a local molecular phonon. The suppression of I for asymmetric junctions with increasing electron–phonon coupling, the hallmark of the Franck–Condon blockade, is discussed. We compare the SNRG currents with recently published data obtained by an iterative summation of path integrals approach (ISPI). Our results excellently agree with the ISPI currents for small and intermediate voltages. In the linear response regime I(V) approaches the current calculated from the equilibrium spectral function. We also present the temperature and voltage evolution of the non-equilibrium spectral functions for a particle–hole asymmetric junction with symmetric coupling to the lead.
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