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Issue 40, 2012
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Vibrational cooling, heating, and instability in molecular conducting junctions: full counting statistics analysis

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Abstract

We study current-induced vibrational cooling, heating, and instability in a donor–acceptor rectifying molecular junction using a full counting statistics approach. In our model, electron–hole pair excitations are coupled to a given molecular vibrational mode which is either harmonic or highly anharmonic. This mode may be further coupled to a dissipative thermal environment. Adopting a master equation approach, we confirm the charge and heat exchange fluctuation theorem in the steady-state limit, for both harmonic and anharmonic models. Using simple analytical expressions, we calculate the charge current and several measures for the mode effective temperature. At low bias, we observe the effect of bias-induced cooling of the vibrational mode. At higher bias, the mode effective temperature is higher than the environmental temperature, yet the junction is stable. Beyond that, once the vibrational mode (bias-induced) excitation rate overcomes its relaxation rate, instability occurs. We identify regimes of instability as a function of voltage bias and coupling to an additional phononic thermal bath. Interestingly, we observe a reentrant behavior where an unstable junction can properly behave at a high enough bias. The mechanism for this behavior is discussed.

Graphical abstract: Vibrational cooling, heating, and instability in molecular conducting junctions: full counting statistics analysis

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Publication details

The article was received on 18 Mar 2012, accepted on 20 Jun 2012 and first published on 24 Jul 2012


Article type: Paper
DOI: 10.1039/C2CP40851A
Citation: Phys. Chem. Chem. Phys., 2012,14, 13820-13834
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    Vibrational cooling, heating, and instability in molecular conducting junctions: full counting statistics analysis

    L. Simine and D. Segal, Phys. Chem. Chem. Phys., 2012, 14, 13820
    DOI: 10.1039/C2CP40851A

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