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Publikace ÚTF

Model ofelectrontunnelingcoupledtotorsionalvibrations:Exact solution andstudyofperformanceofapproximationmethods

Gráf Lukáš, Čížek Martin

A twodimensionalmodelfortheelectroninteractionwithmolecularvibrationsinmolecularjunctionsis
proposed. Alternativelythemodelcanbeappliedtotunnelingthroughacylindricalnano-structure.The
transmission functioniscalculatedaccuratelynumerically.Theexactresultsarethencomparedwith
variousapproximations:(1)completelyfrozenvibrationsforverylightmolecule,(2)Chaseapproxima-
tion forveryheavymolecule,and(3)discrete-state-in-continuummodelinresonantregime.The
validityoftheseapproximationsisdiscussedintermsofthecharacteristictime-scalesandcoupling
strengths. Theexcitationofthevibrationaldegreeoffreedomandtheemergenceofprominentthreshold
structures inthestrongcouplingregimearediscussedinmoredetails
typ:article
journal:Physica E
volume:63
pages:36
year:2014
pacs:2014.05.008
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