Temperature dependent conductances of deformable molecular devices

Details Temperature dependent conductances of deformable molecular devices Temperature dependent conductances of deformable molecular devices

2009-06-04

arxiv.org/abs/0906.0935v1

Phys. Rev. B 80, 155402 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.80.155402

Transport through a molecular device coupled to a vibrational mode is studied. By mapping it to the Yu-Anderson model in the large contact broadening limit, the zero bias electric and heat conductances are evaluated non-perturbatively. These exhibit a step from their T=0 value to half of its value as T increases due to the opening of the inelastic scattering channel. The spectral function exhibits the Franck-Condon suppressed multiphonon steps. The Wiedemann-Franz law is satisfied at low and high temperatures, but is violated in between. Relations to experiments are discussed.

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