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253. 


Vibrational heating in single-molecule switches: an energy-dependent density-of-states approach



T. Brumme, R. Gutierrez, and G. Cuniberti

J. Phys.: Cond. Matter 24, 394003 (2012)

In recent experiments, it has been shown that the switching rate of single-molecule switches can show a rather complicated dependence on the applied bias voltage. Here, we discuss a minimal model which describes the switching process in terms of inelastic scattering processes of the tunneling electron by specific molecular vibrations. One important point is the introduction of an energy-dependent electronic density of states around the Fermi energy. The influence of different model parameters on the switching rate is studied and we show that the inclusion of a variable density of states allows us to understand the non-monotonic behavior of the switching rate observed in some experiments.



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doi absolute link10.1088/0953-8984/24/39/394003
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