Roura-Bas P, Güller F, Tosi L, Aligia A A
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, CONICET, 8400 Bariloche, Argentina.
J Phys Condens Matter. 2019 Nov 20;31(46):465602. doi: 10.1088/1361-648X/ab3684. Epub 2019 Jul 29.
We study the transport through a molecular junction exhibiting interference effects. We show that these effects can still be observed in the presence of molecular vibrations if Coulomb repulsion is taken into account. In the Kondo regime, the conductance of the junction can be changed by several orders of magnitude by tuning the levels of the molecule, or displacing a contact between two atoms, from nearly perfect destructive interference to values of the order of 2e /h expected in Kondo systems. We also show that this large conductance change is robust for reasonable temperatures and voltages for symmetric and asymmetric tunnel couplings between the source-drain electrodes and the molecular orbitals. This is relevant for the development of quantum interference effect transistors based on molecular junctions.
我们研究了通过呈现干涉效应的分子结的输运。我们表明，如果考虑库仑排斥，在存在分子振动的情况下这些效应仍然可以被观察到。在近藤 regime 中，通过调节分子的能级，或者移动两个原子之间的接触，结的电导可以从几乎完全的相消干涉变化几个数量级，达到近藤系统中预期的约 2e /h 的值。我们还表明，对于源漏电极与分子轨道之间对称和非对称隧道耦合，在合理的温度和电压下，这种大的电导变化是稳健的。这对于基于分子结的量子干涉效应晶体管的发展是相关的。
