2011/01/31 by Abdullah Yar, Andrea Donarini, Sonja Koller +1 · 15 citations
Chemistry · Engineering · Physics and Astronomy · #Asymmetry #Atomic physics #Chemistry #Condensed matter physics #Conductance #Coupling (piping) #Degenerate energy levels #Electron #Electron transport chain #Excitation #Materials science #Mechanical and Optical Resonators #Molecular Junctions and Nanostructures #Molecular physics #Molecular vibration #Molecule #Physics #Quantum and electron transport phenomena #Quantum mechanics #Symmetry (geometry) #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.84.115432
published in Physical Review B 84(11) (American Physical Society) · 10 pages, 11 figures, published version
openalex publication_date 2011/09/21 · arxiv created 2011/10/18 · arxiv updated 2015/03/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A theoretical model of a single molecule coupled to many vibronic modes is presented. At low energies, transport is dominated by electron-vibron processes where transfer of an electron through the dot is accompanied by the excitation or emission of quanta (vibrons). Because the frequency of the nth mode is taken as an nth multiple of the frequency of the fundamental mode, several energetically degenerate or quasidegenerate vibronic configurations can contribute to transport. We investigate the consequences of strong electron-vibron coupling in a fully symmetric setup. Several striking features are predicted. In particular, a gate asymmetry and pronounced negative differential conductance features are observed. We attribute these features to the presence of slow channels originating from the interplay of Franck-Condon suppression of transport channels with spin and/or orbital degeneracies.