Phys. Rev. B 74, 205320 (2006) [5 pages]Conductance of a molecule with a center of mass motionReceived 6 September 2006; revised 3 October 2006; published 16 November 2006 We calculate the zero temperature conductance and characteristic correlation functions of a molecule with a center of mass (c.m.) motion which modulates couplings to the leads. In the first model studied, the c.m. vibrational mode is simultaneously coupled to the electron density on the molecule. The conductance is suppressed in regimes corresponding to noninteger occupancy of the molecule. In the second model, where the c.m. mode is not directly coupled to the electron density, the suppression of conductance is related to the dynamic breaking of the inversion symmetry. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.74.205320
DOI:
10.1103/PhysRevB.74.205320
PACS:
73.23.−b, 72.15.Qm, 73.22.−f
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