Report
Quantum Interference in Off-Resonant Transport through Single Molecules
| العنوان: | Quantum Interference in Off-Resonant Transport through Single Molecules |
|---|---|
| المؤلفون: | Pedersen, Kim G. L., Strange, Mikkel, Leijnse, Martin, Hedegård, Per, Solomon, Gemma, Paaske, Jens |
| المصدر: | Phys. Rev. B 90, 125413 (2014) |
| سنة النشر: | 2014 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We provide a simple set of rules for predicting interference effects in off-resonant transport through single-molecule junctions. These effects fall in two classes, showing respectively an odd or an even number of nodes in the linear conductance within a given molecular charge state, and we demonstrate how to decide the interference class directly from the contacting geometry. For neutral alternant hydrocarbons, we employ the Coulson-Rushbrooke-McLachlan pairing theorem to show that the interference class is decided simply by tunneling on and off the molecule from same, or different sublattices. More generally, we investigate a range of smaller molecules by means of exact diag- onalization combined with a perturbative treatment of the molecule-lead tunnel coupling. While these results generally agree well with GW calculations, they are shown to be at odds with simpler mean-field treatments. For molecules with spin-degenerate ground states, we show that for most junctions, interference causes no transmission nodes, but argue that it may lead to a non-standard gate-dependence of the zero-bias Kondo resonance. Comment: 12 pages, 7 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.90.125413 |
| URL الوصول: | http://arxiv.org/abs/1403.4056 |
| رقم الانضمام: | edsarx.1403.4056 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.90.125413 |
|---|